GB2163463A

GB2163463A - Ventilated flat roof structure

Info

Publication number: GB2163463A
Application number: GB08513209A
Authority: GB
Inventors: David Bottomore; Colin Frederick Gibson
Original assignee: Glidevale Building and Products Ltd
Current assignee: Glidevale Building and Products Ltd
Priority date: 1984-08-25
Filing date: 1985-05-24
Publication date: 1986-02-26
Also published as: GB2164141B; GB2164141A; GB2163463B; GB8515835D0; GB8513209D0; GB8421657D0

Abstract

A ventilated flat roof structure comprises a roof space, a fascia 20, roof cover material 21, 21a, 22, overlying the fascia, and ventilation means 1 disposed between the fascia and the roof cover material to define a ventilation path communicating between the roof space and an environment external to the roof space. <IMAGE>

Description

SPECIFICATION Ventilated flat roof structure This invention relates to a ventilated flat roof structure.

According to the present invention there is provided a ventilated flat roof structure comprising a roof space, a fascia, roof cover material overlying the fascia, and ventilation means disposed between the fascia and the roof cover material to define a ventilation path communicating between the roof space and an environment external to the roof space.

Advantageously the ventilation means comprises an elongate ventilation member.

Preferably the ventilation member comprises a panel member and baffle means. The baffle means may comprise a plurality of baffles, said baffles being disposed in the ventilation path. The panel member and the baffles may both be arranged so that they extend substantially parallel to the longitudinal axis of the ventilation member.

Desirably each baffle is arranged at a different distance from the panel member.

In a preferred embodiment the baffle members are arranged in a row, and the row may have an axis extending at an angle to a plane parallel to the ventilation member. Preferably the axis is arranged at an angle between 30 to 60 to the plane parallel to the ventilation member, most preferably 45".

The baffles are conveniently spaced at an equal distance from one another.

The ventilation member preferably includes support means for supporting the baffles. The support means may comprise a plurality of support members extending substantially transverse to the panel member.

The fascia may be any elongate board or panel provided in a roof structure.

The ventilation member may be secured to the fascia, and the support means may serve to space the panel member from a face of the fascia to define a first portion of said ventilation path between the panel member and the fascia. The support means may extend over an upper edge of the fascia to define a second portion of said ventilation path extending over said upper edge. The first and second portions may communicate with one another.

Securing means can be provided for securing the ventilator to the fascia. The securing means preferably comprises two elongate members which are spaced to form a slot therebetween. A screw or nail having a head of greater diameter than the width of the slot may be inserted through the slot, and screwed or hammered into the upper edge of the fascia until the head of the screw or nail abuts against the elongate members.

Reference is now made to the accompanying drawings, in which: Figure 1 is an elevation of ventilation means for use in a ventilated flat roof structure according to the invention; Figure 2 is a section along lines 2-2 of Figure 1; Figure 3 is a perspective view of one form of ventilated flat roof structure according to the invention; Figure 4 is a cross-sectional view of the roof structure shown in Figure 3; and Figure 5 is a perspective view of another form of ventilated flat roof structure according to the invention.

In Figures 1 and 5 ventilation means generally designated 1 comprises a panel member 2 to which support means in the form of a plurality of support members 3 are secured. The support members 3 extend substantially transversely to the panel member 2.

The panel member 2 comprises two non-coplanar portions 2b and 2c which lie in parallel planes. The portions 2b and 2c are connected by a connecting portion 2d.

Baffle means in the form of a plurality of baffles 4 are secured to the support members 3 and extend substantially parallel to the panel member 2.

The baffle members 4 define a plurality of air flow channels 5.

Securing means comprising two elongate members 6 is attached to the support members 3 and a slot 7 is defined between the elongate members 6.

The support members 3 each include a first portion 8a which can extend along an outer face of a fascia and a second portion 8b which can extend along an upper edge of the fascia. The baffle member furthest from the panel member 2 (designated 4a in the drawings) is disposed so that it can engage the outer face of the fascia.

In Figure 3, the ventilator 1 is shown located above a gutter 14, at the lower edge of a flat roof structure.

A nail 12 extends through the slot 7 into an upper edge 16a of the fascia 16 in order to secure the ventilator 1 to the fascia. A head 12a of the nail 12 is of greater diameter than the width of the slot 7 so that the head abuts against the elongate members 6. The fascia 16 runs transverse to, and is secured to, rafters 17. The fascia 16 is also secured to a batten 70 which is secured to external wall 71.

The first portion 8a of each support member 3 spaces the panel member 2 from an outer face 16b of the fascia 16 in order to define a first portion C of a ventilation path B between the panel member and the outer face. A second portion D of the ventilation path B is defined between the upper edge 16a of the fascia 16 and roof cover material 18, 19, between the second portion 8b of adjacent support members 3. The first portion C communicates with the second portion D and extends in a direction which is substantially transverse thereto The first and second portions C and D form part of the ventilation path B which communicates between a roof space 10 of the roof-structure and an external environment 11.

The cover material comprises a roof decking 18 and a waterproof membrane 19 overlying the fascia 16. The waterproof membrane 19 may be, for example, built-up felt, asphalt, or copper or lead sheet.

The roof decking 18 extends over the ventilator 1 and engages the upper edge 2a of the panel mem ber 2, in order to restrict air flow between the decking 18 and the panel member 2. This ensures that the only air flow path into the roof space 10 over the fascia 16 is through the portions C and D of the ventilation path B. A wedge (not shown) may be disposed between the roof decking 18 and the elongate members 6.

An elongate finishing member 41 is arranged at the edge of the roof structure and includes a portion 41a which extends between the decking 18 and the membrane 19, and a portion 41b which extends along the outer surface of the portion 2c of the panel member 2.

The roof cover material 18, 19 is arranged at an angle to the horizontal so that water flows off the material into a gutter 14.

Insulation material 72 is disposed in the roof space 10.

In Figure 5 the ventilator 1 is shown disposed at the high edge of a flat roof structure.

The ventilator 1 is attached to a fascia 20 in the same way as the ventilator 1 is attached to the fascia 16 in Figure 3.

The first portion 8a of the spacer members 3 spaces the panel member 2 from an outer face 20b of the fascia 20 in order to define a first portion E of a ventilation path G between the panel member and the outer face. A second portion F of the ventilation path G is defined between an upper edge 20a of the fascia 20 and roof cover material 21, 22, between adjacent support member 3. The first ventilation path E communicates with the second ventilation path F and extends in a direction which is substantially transverse thereto. The first and second portions E and F form part of the ventilation path G, and the ventilation path G communicates between a roof space 50 and an external environment 51.

The cover material comprises a roofing board upstand 21a secured to a roof decking 21 over which lies a waterproof membrane 22. The waterproof membrane 22 may be, for example, built-up felt, asphalt, or lead or copper sheet.

The roofing board upstand 21a extends over the ventilator 1 and engages the upper edge 2a of the panel member 2 to restrict air flow between the roofing board upstand and the panel member and to ensure that the only air flow path over the fascia 20 is through the portions E and F.

The cross-sectional area available for air flow between the panel member 2 and the fascia boards 16 and 20 of the roof structure is dependent upon the size and frequency of the baffles 4.

This can be chosen so that the ventilated roof structure provides sufficient area for air flow to meet the building regulations required by the laws of any country, such as, for example the U.K. Public Health Act. The baffles also help to prevent ingress of vermin and large insects into the roof structure.

Claims

1. A ventilated flat roof structure comprising a roof space, a fascia, roof cover material overlying the fascia, and ventilation means disposed between the fascia and the roof cover material to define a ventilation path communicating between the roof space and an environment external to the roof space.

2. A ventilated flat roof structure according to Claim 1, in which the ventilation means comprises an elongate ventilation member.

3. A ventilated flat roof structure according to Claim 2, in which the ventilation member comprises a panel member and a plurality of baffles, said baffles being disposed in the ventilation path.

4. A ventilated flat roof structure according to Claim 3, in which the panel member and the baffles extend substantially parallel to the longitudinal axis of the ventilation member.

5. A ventilated flat roof structure according to Claim 3 or 4, in which each baffle is arranged a different distance from the panel member.

6. A ventilated flat roof structure according to Claim 3, 4 or 5, in which the baffles are arranged in a row.

7. A ventilated flat roof structure according to Claim 6, in which the row extends along an axis arranged at an angle to a plane parallel to the panel member.

8. A ventilated flat roof structure according to Claim 7, in which the angle is in the range 30 to 60 .

9. A ventilated flat roof structure according to Claim 7, in which the angle is substantially 45 .

10. A ventilated flat roof structure according to any of Claims 3 to 9, in which the baffles are equally spaced from one another.

11. A ventilated flat roof structure according to any of Claims 3 to 10, in which the ventilation member includes support means for supporting the baffles.

12. A ventilated flat roof structure according to Claim 11, in which the support means comprises a plurality of support members extending substantially transverse to panel member

13. A ventilated flat roof structure according to any of Claims 2 to 12, in which the ventilation member is secured to the fascia.

14. A ventilated flat roof structure according to Claim 13 when dependent upon Claims 11 or 12, in which the support means serves to space the panel member from a face of the fascia to define a first portion of said ventilation path between the panel member and the fascia.

15. A ventilated flat roof structure according to Claim 14, in which the support means extends over an upper edge of the fascia to define a second portion of said ventilation path extending over the upper edge of said fascia, the first and second portions of the ventilation path communicating with one another.

17. A ventilated flat roof structure substantially as herein described with reference to and as shown in the accompanying drawings.