CA1134116A - Roof construction-subceiling assembly - Google Patents
Roof construction-subceiling assemblyInfo
- Publication number
- CA1134116A CA1134116A CA349,537A CA349537A CA1134116A CA 1134116 A CA1134116 A CA 1134116A CA 349537 A CA349537 A CA 349537A CA 1134116 A CA1134116 A CA 1134116A
- Authority
- CA
- Canada
- Prior art keywords
- ceiling
- suspended
- subceiling
- suspended ceiling
- roof
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
ROOF CONSTRUCTION-SUBCEILING ASSEMBLY
Abstract of the Disclosure A roof construction-suspended ceiling system consists of a watertight outer layer and a layer of ther-mal insulation beneath it resting on a metal roof-supporting surface that has a vapor barrier. Below this there is a suspended ceiling system that has insulation placed thereon. The suspended ceiling has openings that will vent the area between the roof construction and the suspended ceiling and the above-said openings may be quickly closed in the event of a fire below the suspended ceiling system.
Abstract of the Disclosure A roof construction-suspended ceiling system consists of a watertight outer layer and a layer of ther-mal insulation beneath it resting on a metal roof-supporting surface that has a vapor barrier. Below this there is a suspended ceiling system that has insulation placed thereon. The suspended ceiling has openings that will vent the area between the roof construction and the suspended ceiling and the above-said openings may be quickly closed in the event of a fire below the suspended ceiling system.
Description
1~34~
- 1 - C~P-6475 ROOF CONSTP~UCTIO.~ UBC~ILI~G AS~MELY
~ackqround of the Invention Field of the Invention The invention is directed to roof construction S and suspended ceiling system and, more particularly, to a fire rated sus~ended ceiling system.
~escriPtion of the Prior Art This invention concerns a roof structure and suspended ceiling system consisting of a roof with a watertight outer layer and a layer of thermal insulation beneath it, resting on a metal roof-su~porting surface that has a vapor barrier, plus a suspended ceiling that is su~pended from the rocf-supporting surface with the ceiling tile supported by suspended rails.
There is already a known roof structure and suspended ceiling system in which the rails that sup~ort the ceiling tiles of the suspended ceiling are sus~ended from a rnetal corruqated roof-supporting surface. The roof-supportina surface has a layer of sheet gypsum on its upper side and a layer of thermal insulation such as mineral wool above it, and this is sealed by a watertight outer layer. The roof-su~porting surface forl~s a vapor barrier Canadian Patent 1,062,431. It is also known that a layer of asphalt can be ap~lied to the roof-supporting surface to form the vapor barrier.
It has been found that in the event of fire, the fire resistance of this syste~ does not ~eet the 90-~inute re~uirement, ~espite the layer of sheet gypsum on A *
...... .
, ~ .
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- 1 - C~P-6475 ROOF CONSTP~UCTIO.~ UBC~ILI~G AS~MELY
~ackqround of the Invention Field of the Invention The invention is directed to roof construction S and suspended ceiling system and, more particularly, to a fire rated sus~ended ceiling system.
~escriPtion of the Prior Art This invention concerns a roof structure and suspended ceiling system consisting of a roof with a watertight outer layer and a layer of thermal insulation beneath it, resting on a metal roof-su~porting surface that has a vapor barrier, plus a suspended ceiling that is su~pended from the rocf-supporting surface with the ceiling tile supported by suspended rails.
There is already a known roof structure and suspended ceiling system in which the rails that sup~ort the ceiling tiles of the suspended ceiling are sus~ended from a rnetal corruqated roof-supporting surface. The roof-supportina surface has a layer of sheet gypsum on its upper side and a layer of thermal insulation such as mineral wool above it, and this is sealed by a watertight outer layer. The roof-su~porting surface forl~s a vapor barrier Canadian Patent 1,062,431. It is also known that a layer of asphalt can be ap~lied to the roof-supporting surface to form the vapor barrier.
It has been found that in the event of fire, the fire resistance of this syste~ does not ~eet the 90-~inute re~uirement, ~espite the layer of sheet gypsum on A *
...... .
, ~ .
li3~
- 2 - C~,P-6475 the roof-supporting surface that forMs a heat sink, because the metal roof-supporting surface reaches excessively high temperatures too ra?idly.
To prevent this ra~id heating of the metal roof-supporting surface in the space beneath the suspended ceiling in the event of fire, a layer of mineral wool could be applied as ther~al insulation to the ceiling tiles of the suspended ceilin~, but t'ne disadvantage of this arrangement is that in unfavorable weather conditions, the dew point in the space between the suspended ceiling and the roof-supporting surface could shift, so the suspended ceiling would be exposed to moisture, and this must be avoided at all costs.
To keep the dew point outside the space, even in very cold weather, the layer of thermal insulation on the roof-supporting surface would have to be increased considerably, so that increased cost due to this method would result in a very expensive roof structure and suspended ceiling system.
.~um~mar~y of the Invention The invention is directed to a roof construc-tion and subceiling assembly consisting of a water imPer-meable outer layer and a heat insulating layer installed below the outer layer, both of which rest on a metal deck which is a vapor barier. Eelow the metal deck, a sub-ceiling is suspended with ceiling boards supported by suspended supporting runners. A heat insulating layer is installed between the deck and the subceiling. At points of the subceilina determined by ventilation aspects of the ceiling boards, the overlying intermediate insulation material and ceilin~ boards are lifted to form an air passage bet~7een the area below the suspended ceiling and the area between the subceiling and the deck. Ceiling boards are also maintained at these points in a lifted position by a Member which will melt, decompose, or otherwise lose its consistency under the influence of heat and that after the deco~position of said member, , , .
113~ti
To prevent this ra~id heating of the metal roof-supporting surface in the space beneath the suspended ceiling in the event of fire, a layer of mineral wool could be applied as ther~al insulation to the ceiling tiles of the suspended ceilin~, but t'ne disadvantage of this arrangement is that in unfavorable weather conditions, the dew point in the space between the suspended ceiling and the roof-supporting surface could shift, so the suspended ceiling would be exposed to moisture, and this must be avoided at all costs.
To keep the dew point outside the space, even in very cold weather, the layer of thermal insulation on the roof-supporting surface would have to be increased considerably, so that increased cost due to this method would result in a very expensive roof structure and suspended ceiling system.
.~um~mar~y of the Invention The invention is directed to a roof construc-tion and subceiling assembly consisting of a water imPer-meable outer layer and a heat insulating layer installed below the outer layer, both of which rest on a metal deck which is a vapor barier. Eelow the metal deck, a sub-ceiling is suspended with ceiling boards supported by suspended supporting runners. A heat insulating layer is installed between the deck and the subceiling. At points of the subceilina determined by ventilation aspects of the ceiling boards, the overlying intermediate insulation material and ceilin~ boards are lifted to form an air passage bet~7een the area below the suspended ceiling and the area between the subceiling and the deck. Ceiling boards are also maintained at these points in a lifted position by a Member which will melt, decompose, or otherwise lose its consistency under the influence of heat and that after the deco~position of said member, , , .
113~ti
- 3 - ce~-~475 said ceiling boards together with the overlying insula-tion layer, will fall into position substantially closing the subceiling and form a fire barrier between the area below the subceiling and the area above the subceiling.
3rief Description of the Drawinqs Figure 1 shows one version of a roof structure and suspended ceilin~ system in sectional view;
Fi~ure 2 shows a sectional view of a raised ceiling tile; and Figure 3 shows the arranqe~ent in ~igure 2 again in prospective.
Description of the Preferred ~mbodi~ents The invention herein is ~ased on the task of designing a roof structure and suspended ceiling syste~
of the type described initially in such a way that with a relatively minor addition of expense in terms of material, fire resistance can be achieved that corresponds at least to the 9G-minute limit.
Startin~ with the roof structure and suspended ceiling syster,~ of the type described initially, the probler~ of fire resistance is solved by adding an ir.ter-mediate layer of thermal insulation in the space between the roof-su?~orting surface and the sus~ended ceiling in such a way that the ceiling tiles and the intermediate insula'cion ~aterial above it are elevated at certain points (determined on the basis of ventilation considerations) to for~ air passages between the spaces above and below the sus~ended ceiling. These ceiling tiles are ~;eld in raised position by at least one element of a substance that melts, dissolves, or otherwise loses its strength under the influence of heat, in such a way that in the absence of this element, the ceilin~ tiles and the intermediate insulation ~raterial above them will drop into a position sealing the suspended ceiling and intermediate layer, where they are held by ~eans of the su~porting rails.
34~
3rief Description of the Drawinqs Figure 1 shows one version of a roof structure and suspended ceilin~ system in sectional view;
Fi~ure 2 shows a sectional view of a raised ceiling tile; and Figure 3 shows the arranqe~ent in ~igure 2 again in prospective.
Description of the Preferred ~mbodi~ents The invention herein is ~ased on the task of designing a roof structure and suspended ceiling syste~
of the type described initially in such a way that with a relatively minor addition of expense in terms of material, fire resistance can be achieved that corresponds at least to the 9G-minute limit.
Startin~ with the roof structure and suspended ceiling syster,~ of the type described initially, the probler~ of fire resistance is solved by adding an ir.ter-mediate layer of thermal insulation in the space between the roof-su?~orting surface and the sus~ended ceiling in such a way that the ceiling tiles and the intermediate insula'cion ~aterial above it are elevated at certain points (determined on the basis of ventilation considerations) to for~ air passages between the spaces above and below the sus~ended ceiling. These ceiling tiles are ~;eld in raised position by at least one element of a substance that melts, dissolves, or otherwise loses its strength under the influence of heat, in such a way that in the absence of this element, the ceilin~ tiles and the intermediate insulation ~raterial above them will drop into a position sealing the suspended ceiling and intermediate layer, where they are held by ~eans of the su~porting rails.
34~
- 4 - CBP-6475 The roof structure and suspended ceiling arran~e~ent, according to this invention, has the advan-tage that despite the intermediate layer of thermal insu-lation material, the space between the roof-supported surface and the suspended cei]ing is sufficiently ven-tilate~ so that there cannot be a shift in the dew point in this space. In the event of a fire in the space beneath the suspended ceiling, the ele~ent supporting the upward tilted ceiling tiles dissolves, or otherwise loses 1~ it strength very rapidly owing to the heat evolved, so the supporting effect is lost and both the ceilin~ tiles and inter~ediate insulation on it drop down under the influence of gravity, so they completely cover the ceiling area previously exposed when they were tilted upward, i.e., completely sealing the passage of air in the space between the roof-sup~orting surface and the suspended ceiling, while at the same ti~e, the inter-mediate layer of thermal insulation material for,-ns a con-tinuous layer in this space. ~t this mo~ent, a shift in dew point is no longer of interest. Due to the insu-latin~ effect of tnis suspended ceiling and the inter-~,ediate layer above it, the roof-supporting surface will heat only gradually, so the roof structure and suspended ceiling system has a fire resistance that lasts to 90 minutes or more, i.e., it achieves the fire resistance of concrete systems.
A device is already known for sealing an openin~ in a fireproof ceiling with a solid me~ber that surrounds it in the form of a frame and at least one fireproof sheet to cover the opening, with an element that holds the sheet directly in the open position inserted between the fireproof sheet and a solid ~ember of the fireproof ceiling, such that said element consists of a substance that !nelts, dissolves, or otherwise loses its strength under the influence of heat (for example polystyrene foam is suita~le-for this purpose, German ~atent 1,658,786). The surprising advantageous use of ~134~ti - S - C~P-6475 such a device according to this invention for solving the dew point problem while at the same time achieving a higher fire resistance class for a roof structure and suspended ceiling system cannot, however, be deduced from this state of the art.
It is advantageous for the ceiling tiles with the intermediate insulation material above them to be held in an up~lard inclined position on a supporting rail and to be held in this position by at least one element consisting of a material that melts, disssolves, or otherwise loses its strength under the influence of heat and is positioned on the supporting rails. The air passage thus achieved at the predetermined locations is great enough to ventilate the space between the roof-supporting surface and the suspended ceiling adequately.In the event of a fire, the raised ceiling tiles drop into the closing position when their supporting element dissolves, completely sealing the suspended ceiling and not preventing any flow of air into the space between the roof-supporting surface and the suspended ceiling. At the same time, the intermediate layer of insulation material above the ceiling tile is tiltecl in the direc-tion of the suspended ceiling, forming an essentially continuous intermediate layer OL thermal insulation.
It is advantageous for the tilted ceiling tiles to be in ~uide rails that hold the position closing the .
suspended ceiling and secure the tiles in a continuous suspended ceiling and continuous intermediate layer in the event of a fire. This can be accomplished by means of guide plates, wire clips, etc. ~n ornamental grill or a light transmitting grill that allows air to pass throu~h can be placed at those locations where the ceiling tiles are raised so the visual impression of this suspended ceiling will not be impaired by the raised ceiling tiles. When tlle supportina element melts in the event of a fire, the ceiling tile drops down onto the relatively thin grill, or if the grill itself dissolves -~: 113~
due to heat, the ceiling tile will drop down onto the supporting rail, so again, a continuous sus~ended ceiling is formed, preventing the passage of air into the space between the roof-supportin~ surface and the suspended ceiling, and maintaining a continuous intermediate layer of thermal insulation.
As mentioned above, the element that melts under the influence of heat should consist of a foa~
plastic such as polystyrene foa~ that Melts at 70 C. to 1~ 80 C.
The roof structure and suspended ceiling system shown in the figures consist of a roof-supporting surface of sheet metal with corrugated reinforce~ents. A vapor barrier may be provided by the roof-supporting surface itself or it may consist of a layer of asphalt or alumi-nu~ foil applied to the roof-supporting surface 4. Above layer 3, there is a layer of thermal insulation 2 which may consist of mineral wool, for exa~ple. This layer of thermal insulation 3 is sealed on the outside by a water-2~ tight layer 1 which may consist of f1m or roofing pa~er.
The ends o~ T-shaped sup~orting rails 8 are suspended from the roof-supporting surface 4 with the help of wires 5, the flanges 10 support the ceiling tiles 7 of a suspended ceiling syste~. Such a suspended ceilin~ system is also referred to as a st.ip grid ceiling. ~n intermediate layer 11 of thermal insulation is ap~lied to the ends 9 of supportin~ rails 8 and this layer may consist of mineral wool.
~t certain locations, a thin grill 15 is laid on the flan~e 10 of adjacent sup~orting rails 8. In the area of one supporting rail 8, one edge of a ceiling tile 13 lies on this grill 15, with the tile tilted upward and supported by means of wedge-shaped ele~ent 14 that rests on the ~rill 15 in the area of the adjacent supporting rail 8. Together with the ceiling tile 13, the inter-mediate layer 16 of insulating material above the ceiling tile is also tilted upward, and for this reason, the : 1134~
intermediate layer 11 is cut alon~ the plane of separa-tion 12.
O~in~ to the fact that the ceiling tiles 13 are tilted upward, air can flow from space 21 into space 2~
and vice versa throu~h the air passage 22 and the grill 15, so that air circulation in space 21 influences space 20 in such a way that despite the intermediate layer 11 of thermal insulation, there cannot be a shift of dew point into the interior of space 20, even under extremely unfavorable weather conditions.
The elements 14 that are in the form of a cube in Figures 2 and 3, and in the form of a wedge in Figure ~-1 consist of a material such as ~olystyrene foam that melts and dissolves very rapidly under the influence of heat. In the event of a fire in space 21, ceilin~ tile 13 therefore drops into a horizontal position on the grill 15 when element 14 loses its strength due to heat, or if the grill is ~lade of the sa~e material as element 14 that dissolves under heat and the ceiling tile drops onto the supporting flange of the adjacent sup~orting rails 8, closin~ the air passage 22. At the sa~e time, the intermediate layer 16 of insulation material on the ceiling tile 13 also drops into horizontal-position, forming a continuous interr~lediate layer 11. Air is also prevented from passing between spaces 20 and 21. In addition, good thermal insulation of space 20 aaainst space 21 is also achieved, so the roof-supportin~ surface 4 can heat only very slowly, and roof structure and suspended ceiling syste~ as a whole has a fire resistance 3~ accordin~ to the 9~-~inute limitation and even con-siderably better.
As shown in ~igures 2 and 3, the ceiling tiles 13 with the intermediate layer 14 of insulation ~aterial above the~l can be raised into vertical position to form the air passage 22 and kept in this position by cubicle elel~ents 14. When these elements 14 dissolve under the influence of heat in the event of a fire in space 21, the 1~3~
- 8 - C~-6475 ceilin~ tiles 13 with the intermediate layer 16 of insulation l~aterial will drop into the pro~er closing position in the U-shaped guides 23 at the side under the influence of gravity.
A device is already known for sealing an openin~ in a fireproof ceiling with a solid me~ber that surrounds it in the form of a frame and at least one fireproof sheet to cover the opening, with an element that holds the sheet directly in the open position inserted between the fireproof sheet and a solid ~ember of the fireproof ceiling, such that said element consists of a substance that !nelts, dissolves, or otherwise loses its strength under the influence of heat (for example polystyrene foam is suita~le-for this purpose, German ~atent 1,658,786). The surprising advantageous use of ~134~ti - S - C~P-6475 such a device according to this invention for solving the dew point problem while at the same time achieving a higher fire resistance class for a roof structure and suspended ceiling system cannot, however, be deduced from this state of the art.
It is advantageous for the ceiling tiles with the intermediate insulation material above them to be held in an up~lard inclined position on a supporting rail and to be held in this position by at least one element consisting of a material that melts, disssolves, or otherwise loses its strength under the influence of heat and is positioned on the supporting rails. The air passage thus achieved at the predetermined locations is great enough to ventilate the space between the roof-supporting surface and the suspended ceiling adequately.In the event of a fire, the raised ceiling tiles drop into the closing position when their supporting element dissolves, completely sealing the suspended ceiling and not preventing any flow of air into the space between the roof-supporting surface and the suspended ceiling. At the same time, the intermediate layer of insulation material above the ceiling tile is tiltecl in the direc-tion of the suspended ceiling, forming an essentially continuous intermediate layer OL thermal insulation.
It is advantageous for the tilted ceiling tiles to be in ~uide rails that hold the position closing the .
suspended ceiling and secure the tiles in a continuous suspended ceiling and continuous intermediate layer in the event of a fire. This can be accomplished by means of guide plates, wire clips, etc. ~n ornamental grill or a light transmitting grill that allows air to pass throu~h can be placed at those locations where the ceiling tiles are raised so the visual impression of this suspended ceiling will not be impaired by the raised ceiling tiles. When tlle supportina element melts in the event of a fire, the ceiling tile drops down onto the relatively thin grill, or if the grill itself dissolves -~: 113~
due to heat, the ceiling tile will drop down onto the supporting rail, so again, a continuous sus~ended ceiling is formed, preventing the passage of air into the space between the roof-supportin~ surface and the suspended ceiling, and maintaining a continuous intermediate layer of thermal insulation.
As mentioned above, the element that melts under the influence of heat should consist of a foa~
plastic such as polystyrene foa~ that Melts at 70 C. to 1~ 80 C.
The roof structure and suspended ceiling system shown in the figures consist of a roof-supporting surface of sheet metal with corrugated reinforce~ents. A vapor barrier may be provided by the roof-supporting surface itself or it may consist of a layer of asphalt or alumi-nu~ foil applied to the roof-supporting surface 4. Above layer 3, there is a layer of thermal insulation 2 which may consist of mineral wool, for exa~ple. This layer of thermal insulation 3 is sealed on the outside by a water-2~ tight layer 1 which may consist of f1m or roofing pa~er.
The ends o~ T-shaped sup~orting rails 8 are suspended from the roof-supporting surface 4 with the help of wires 5, the flanges 10 support the ceiling tiles 7 of a suspended ceiling syste~. Such a suspended ceilin~ system is also referred to as a st.ip grid ceiling. ~n intermediate layer 11 of thermal insulation is ap~lied to the ends 9 of supportin~ rails 8 and this layer may consist of mineral wool.
~t certain locations, a thin grill 15 is laid on the flan~e 10 of adjacent sup~orting rails 8. In the area of one supporting rail 8, one edge of a ceiling tile 13 lies on this grill 15, with the tile tilted upward and supported by means of wedge-shaped ele~ent 14 that rests on the ~rill 15 in the area of the adjacent supporting rail 8. Together with the ceiling tile 13, the inter-mediate layer 16 of insulating material above the ceiling tile is also tilted upward, and for this reason, the : 1134~
intermediate layer 11 is cut alon~ the plane of separa-tion 12.
O~in~ to the fact that the ceiling tiles 13 are tilted upward, air can flow from space 21 into space 2~
and vice versa throu~h the air passage 22 and the grill 15, so that air circulation in space 21 influences space 20 in such a way that despite the intermediate layer 11 of thermal insulation, there cannot be a shift of dew point into the interior of space 20, even under extremely unfavorable weather conditions.
The elements 14 that are in the form of a cube in Figures 2 and 3, and in the form of a wedge in Figure ~-1 consist of a material such as ~olystyrene foam that melts and dissolves very rapidly under the influence of heat. In the event of a fire in space 21, ceilin~ tile 13 therefore drops into a horizontal position on the grill 15 when element 14 loses its strength due to heat, or if the grill is ~lade of the sa~e material as element 14 that dissolves under heat and the ceiling tile drops onto the supporting flange of the adjacent sup~orting rails 8, closin~ the air passage 22. At the sa~e time, the intermediate layer 16 of insulation material on the ceiling tile 13 also drops into horizontal-position, forming a continuous interr~lediate layer 11. Air is also prevented from passing between spaces 20 and 21. In addition, good thermal insulation of space 20 aaainst space 21 is also achieved, so the roof-supportin~ surface 4 can heat only very slowly, and roof structure and suspended ceiling syste~ as a whole has a fire resistance 3~ accordin~ to the 9~-~inute limitation and even con-siderably better.
As shown in ~igures 2 and 3, the ceiling tiles 13 with the intermediate layer 14 of insulation ~aterial above the~l can be raised into vertical position to form the air passage 22 and kept in this position by cubicle elel~ents 14. When these elements 14 dissolve under the influence of heat in the event of a fire in space 21, the 1~3~
- 8 - C~-6475 ceilin~ tiles 13 with the intermediate layer 16 of insulation l~aterial will drop into the pro~er closing position in the U-shaped guides 23 at the side under the influence of gravity.
Claims (10)
1. A roof construction-subceiling assembly consisting of a water impermeable outer layer and heat insulating layer installed below which rest on a metal deck comprising a vapor barrier, as well as of a sub-ceiling suspended on the deck, the ceiling boards of which are supported by suspended supporting runners, characterized in that a heat insulating intermediate layer is installed in the room between the deck and the subceiling, that at points of the subceiling determined by ventilation aspects, the ceiling boards and the overlying intermediate layer of material are lifted to form an air passage between the rooms above and below the subceiling, that each of the ceiling boards is maintained in the lifted position by at least one member of a material melting, decomposing, or otherwise losing its consistency under the influence of heat, that after the decomposition of said member, said ceiling boards, together with the overlying intermediate layer of material, fall into the position substantially closing the subceiling and the intermediate layer in which they are maintained by means of the supporting runners.
2. Roof construction-subceiling assembly according to claim 1 characterized in that the ceiling boards together with the overlying intermediate layer of material are installed with one edge on a supporting runner in a diagonal position and are maintained in said position by at least one member of the material melting, decomposing, or otherwise losing its consistency under the influence of heat which is placed on the supporting runners.
3. Roof construction-subceilinq assembly according to claim 1 characterizing that the ceiling board together with the overlying intermediate layer of material is maintained in a position lifted above and substantially parallel to the subceiling by members of the material melting, decomposing, or otherwise losing its consistency under the influence of heat which are supported by the supporting runners.
4. Roof construction-subceiling assembly according to claim 2 or 3 characterized by guideways, guiding the ceiling boards into the position closing the subceiling.
5. Roof construction-subceiling assembly according to claims 1 or 2 or 3, characterized in that the member melting under the influence of heat con-sist of a foam. plastic material melting at a temperature of 70°C. to 80°C. such as foam polystyrene.
6. Roof construction-subceiling assembly according to claim 1, characterized in that in place of the lifted ceiling boards, a louvre allowing passage of an air current, such as a grid plate, for example is installed.
7. Roof construction-subceiling assembly according to claim 6, characterized in that the louvre consist of a mterial melting, decomposing, or otherwise losing its consistency under the influence of heat.
8 A roof and suspended ceiling assembly con-sisting of:
(a) a roof construction which has a water impermeable outer layer which is positioned a heat insu-lating layer, and below this heat insulating layer there is metal roof deck, said metal roof deck having a vapor barrier adjacent thereto; and (b) said suspended ceiling system con-sisting of suspended supporting runners which are disposed below the roof deck, and ceiling boards disposed on said suspended supporting runners with an intermediate layer of insulating material disposed above the ceiling boards and also supported by the suspended ceiling runners; and (c) The improvement comprising openings at points in the suspended ceiling system that provide communication between the area below the suspended ceiling system and the area above the suspended ceiling system, and ceiling boards positioned adjacent each of these openings with intermediate insulating material overlying said ceiling boards; and (d) said ceiling boards being mounted in a raised position from the plane of the suspended ceiling system above said openings and being maintained in these raised positions by a member which is composed of a material which will melt, decompose, or otherwise lose its supporting structure under the influence of heat whereby after decomposition of said supporting material, said ceiling boards together with said overlying intermediate insulation layer fall into position substantially closing the openings in the suspended ceiling.
(a) a roof construction which has a water impermeable outer layer which is positioned a heat insu-lating layer, and below this heat insulating layer there is metal roof deck, said metal roof deck having a vapor barrier adjacent thereto; and (b) said suspended ceiling system con-sisting of suspended supporting runners which are disposed below the roof deck, and ceiling boards disposed on said suspended supporting runners with an intermediate layer of insulating material disposed above the ceiling boards and also supported by the suspended ceiling runners; and (c) The improvement comprising openings at points in the suspended ceiling system that provide communication between the area below the suspended ceiling system and the area above the suspended ceiling system, and ceiling boards positioned adjacent each of these openings with intermediate insulating material overlying said ceiling boards; and (d) said ceiling boards being mounted in a raised position from the plane of the suspended ceiling system above said openings and being maintained in these raised positions by a member which is composed of a material which will melt, decompose, or otherwise lose its supporting structure under the influence of heat whereby after decomposition of said supporting material, said ceiling boards together with said overlying intermediate insulation layer fall into position substantially closing the openings in the suspended ceiling.
9. A roof structure and subceiling assembly consist-ing of:
(a) a roof structure which is composed of:
(1) a metal deck, (2) over top of the metal deck there being positioned a heat insulating layer, (3) over top of the heat insulating layer there being positioned a water impermeable outer layer, (b) below the roof structure there being positioned a suspended ceiling, said suspended ceiling comprising:
(1) a plurality of suspended support runners, (2) positioned on the support runners a plurality of ceiling boards, (3) over top of the ceiling boards there being positioned an intermediate heat insulating layer, (c) the improvement comprising:
(1) a plurality of ventilation openings in the suspended ceiling providing for air passage from the area below the suspended ceiling into the area above the suspended ceiling between the suspended ceiling and roof structure, (2) said ventilation openings being capable of being closed by a fire barrier, said fire barrier comprising:
(a) a ceiling board sized to fit within the ventilation opening and having one edge of the ceiling board resting on a support runner in a diagonal position so that the opposite edge of the ceiling board is raised above the plane of the suspended ceiling, said ceiling board being supported in position by a supporting member of a material which will melt, decompose, or otherwise lose its rigidity under the influence of heat so that, after the decomposition of said supporting member, said ceiling board, together with the overlying intermediate layer of heat insulation material will fall into posi-tion substantially closing the ventilation opening with ceiling board in position in the plane of the suspended ceiling and the overlying intermediate layer of insulation being placed in position over top of the ceiling board.
(a) a roof structure which is composed of:
(1) a metal deck, (2) over top of the metal deck there being positioned a heat insulating layer, (3) over top of the heat insulating layer there being positioned a water impermeable outer layer, (b) below the roof structure there being positioned a suspended ceiling, said suspended ceiling comprising:
(1) a plurality of suspended support runners, (2) positioned on the support runners a plurality of ceiling boards, (3) over top of the ceiling boards there being positioned an intermediate heat insulating layer, (c) the improvement comprising:
(1) a plurality of ventilation openings in the suspended ceiling providing for air passage from the area below the suspended ceiling into the area above the suspended ceiling between the suspended ceiling and roof structure, (2) said ventilation openings being capable of being closed by a fire barrier, said fire barrier comprising:
(a) a ceiling board sized to fit within the ventilation opening and having one edge of the ceiling board resting on a support runner in a diagonal position so that the opposite edge of the ceiling board is raised above the plane of the suspended ceiling, said ceiling board being supported in position by a supporting member of a material which will melt, decompose, or otherwise lose its rigidity under the influence of heat so that, after the decomposition of said supporting member, said ceiling board, together with the overlying intermediate layer of heat insulation material will fall into posi-tion substantially closing the ventilation opening with ceiling board in position in the plane of the suspended ceiling and the overlying intermediate layer of insulation being placed in position over top of the ceiling board.
10. A roof structure and subceiling assembly con-sisting of:
(a) a roof structure which is composed of:
(1) a metal deck, (2) over top of the metal deck there being posi-tioned a heat insulating layer, (3) over top of the heat insulating layer there being positioned a water impermeable outer layer, (b) below the roof structure there being posi-tioned a suspended ceiling, said suspended ceiling comprising:
(1) a plurality of suspended support runners, (2) positioned on the supporting runners are a plurality of ceiling boards, (3) over top of the ceiling boards there being positioned an intermediate heat insulating layer, (c) the improvement comprising:
(1) a plurality of ventilation openings in the suspended ceiling providing for air passage from the area below the suspended ceiling into the area above the suspended ceiling between the suspended ceiling and roof structure, (2) a louvre structure placed in each ventilating opening in lieu of a ceiling board and allowing passage of an air current, (3) a ceiling board positioned above the said louvre but permitting passage of air through the louvre into the area above the suspended ceiling, (4) said ceiling board being supported in its raised position above the louvre by a support-ing member resting on said louvre, said louvre and/or said supporting member will melt, decom-pose, or otherwise lose their rigidity upon the influence of heat so that after decomposition of said louvre and/or said supporting member, said ceiling board will fall into position, substantially closing the ventilation opening.
(a) a roof structure which is composed of:
(1) a metal deck, (2) over top of the metal deck there being posi-tioned a heat insulating layer, (3) over top of the heat insulating layer there being positioned a water impermeable outer layer, (b) below the roof structure there being posi-tioned a suspended ceiling, said suspended ceiling comprising:
(1) a plurality of suspended support runners, (2) positioned on the supporting runners are a plurality of ceiling boards, (3) over top of the ceiling boards there being positioned an intermediate heat insulating layer, (c) the improvement comprising:
(1) a plurality of ventilation openings in the suspended ceiling providing for air passage from the area below the suspended ceiling into the area above the suspended ceiling between the suspended ceiling and roof structure, (2) a louvre structure placed in each ventilating opening in lieu of a ceiling board and allowing passage of an air current, (3) a ceiling board positioned above the said louvre but permitting passage of air through the louvre into the area above the suspended ceiling, (4) said ceiling board being supported in its raised position above the louvre by a support-ing member resting on said louvre, said louvre and/or said supporting member will melt, decom-pose, or otherwise lose their rigidity upon the influence of heat so that after decomposition of said louvre and/or said supporting member, said ceiling board will fall into position, substantially closing the ventilation opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA349,537A CA1134116A (en) | 1980-04-10 | 1980-04-10 | Roof construction-subceiling assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA349,537A CA1134116A (en) | 1980-04-10 | 1980-04-10 | Roof construction-subceiling assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1134116A true CA1134116A (en) | 1982-10-26 |
Family
ID=4116679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA349,537A Expired CA1134116A (en) | 1980-04-10 | 1980-04-10 | Roof construction-subceiling assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1134116A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4593610A (en) * | 1985-03-04 | 1986-06-10 | Chabot Paul Andre | Automatic damper for chimney flue |
-
1980
- 1980-04-10 CA CA349,537A patent/CA1134116A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4593610A (en) * | 1985-03-04 | 1986-06-10 | Chabot Paul Andre | Automatic damper for chimney flue |
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| MKEX | Expiry |