GB2594422A

GB2594422A - Secondary glazing

Info

Publication number: GB2594422A
Application number: GB2110985.5A
Authority: GB
Inventors: Peter Desorgher Neal
Original assignee: Granada Glazing Ltd
Current assignee: Granada Glazing Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-10-27
Anticipated expiration: 2041-07-30
Also published as: GB2594422B; GB202110985D0

Abstract

The secondary glazing apparatus 100 includes a secondary glazing panel 152, and a corresponding method of assembly. The apparatus comprises: a pane 102 of glazing material; a frame section 104 comprising a pane channel 112, the pane channel comprising a first channel side 114, a second channel side 116 and a channel base 118. The pane channel has a width to receive a first pane edge 120 of the pane, and having a length at least as long as the first pane edge. A first gasket 122 within the pane channel, wherein the first gasket comprises: a gasket side portion 124 configured to separate a first major surface 128 of the pane from the first channel side. The gasket end portion 126 is configured to separate the first pane edge from the channel base, wherein the gasket end portion and/or the channel base is configured so that a compressible cavity 130 is provided between a face 132 of the gasket end portion and the channel base. The gasket may be L shaped.

Description

SECONDARY GLAZING

FIELD OF THE INVENTION

Embodiments of the present invention relate to a secondary glazing apparatus, a secondary glazing panel and a method of assembly. In particular, they relate to a wrap around secondary glazing apparatus for indoor use.

BACKGROUND TO THE INVENTION

A secondary glazing panel is a term of the art for a window that supplements primary glazing to provide benefits including a reduction in noise and a reduction in heat loss. The secondary glazing panel is installed to the room interior side of the primary glazing, forming an insulating air pocket therebetween.

Traditionally, a secondary glazing panel is assembled using the 'wrap around' method. First, a U-shaped flexible gasket (e.g., nitrile) is pushed over the edges of a pane of glass glazing material. Then, frame sections (panel rails) each comprising a U-shaped channel are pushed onto the edges of the pane of glass, until the U-shaped flexible gasket is seated within the channels. Due to the tight fit, the operator will hit the frame sections with a hammer. Once the frame sections are correctly seated around the pane of glass, the operator will secure the frame sections together to complete the assembly of the panel.

The method has several challenges.

It requires skill by the operator to judge if they have inserted the glass-gasket combination too far, or not enough, into the channel.

If the operator hits the frame sections too hard with the hammer, they may dent the frame section. If the operator misjudges and 'bottoms out' the glass-gasket combination within a channel, then when they hit the frame section with the hammer they are actually transferring the impact force to the glass.

If the operator does not center the glass leaving a gap between the glass-gasket 5 combination and the bases of the frame sections, then when they screw the four frame sections together they bottom out the glass-gasket combination and the screwing puts pressure on the glass.

The process is made more difficult by the fact that the glass pane is generally not exactly square cut. Therefore, the glass may be correctly seated around most of its perimeter but bottomed out on one end of its length.

Operator skill is required throughout the process to keep the gasket evenly pushed into the frame section and to neatly trim the excess gasket.

BRIEF DESCRIPTION OF VARIOUS EMBODIMENTS OF THE INVENTION

According to various, but not necessarily all embodiments of the invention there is provided a secondary glazing apparatus comprising: a pane of glazing material; a frame section comprising a pane channel, the pane channel comprising a first channel side, a second channel side and a channel base, the pane channel having a width to receive a first pane edge of the pane, and having a length at least as long as the first pane edge; a first gasket within the pane channel, wherein the first gasket comprises: a gasket side portion configured to separate a first major surface of the pane from the first channel side; and a gasket end portion configured to separate the first pane edge from the channel base, wherein the gasket end portion and/or the channel base is configured so that a compressible cavity is provided between a face of the gasket end portion and the channel base.

This provides the advantage that a secondary glazing panel is easier and quicker to assemble without placing stress on the pane. Further, there is more tolerance to panes that are not precisely square cut.

According to various, but not necessarily all embodiments of the invention there is provided a secondary glazing apparatus comprising: a frame section comprising a pane channel, the pane channel comprising a first channel side, a second channel side and a channel base, the pane channel having a width to receive a first pane edge a pane of glazing material, and having a length of at least tens of centimetres; a first gasket within the pane channel, wherein the first gasket comprises: a gasket side portion configured to separate a first major surface of the pane from the first channel side; and a gasket end portion configured to separate the first pane edge from the channel base, wherein the gasket end portion and/or the channel base is configured so that a compressible cavity is provided between a face of the gasket end portion and the channel base.

According to various, but not necessarily all embodiments of the invention there is provided a secondary glazing panel comprising a first frame section for a first pane edge of a pane arrangement of one or more panes of glazing material, a second frame section for a second pane edge of the pane arrangement, a third frame section for a third pane edge of the pane arrangement, and a fourth frame section for a fourth pane edge of the pane arrangement, wherein each of the first, second, third and fourth frame sections comprises a pane channel as described above within which is a first gasket as described above, the length of each pane channel being at least as long as each corresponding pane edge.

This provides the advantage that the pane can 'float' within the fully assembled frame due to the compressible cavities, until the pane is subsequently wedged into its final position, e.g., by applying a wedge gasket.

According to various, but not necessarily all embodiments of the invention there is provided a method of wrap around assembly of the secondary glazing panel, the method comprising: mating the first pane edge with the pane channel of the first frame section within which is a length of the first gasket; mating the second pane edge with the pane channel of the second frame section within which is a length of the first gasket; securing the first frame section and second frame section to each other; mating the third pane edge with the pane channel of the third frame section within which is a length of the first gasket; securing the third frame section to the first or second frame section; mating the fourth pane edge with the pane channel of the fourth frame section within which is a length of the first gasket; and securing the fourth frame section to the third and first or second frame sections.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of various examples of embodiments of the present invention reference will now be made by way of example only to the 25 accompanying drawings in which: FIG. 1 illustrates an example of a frame section of a secondary glazing apparatus; FIG. 2 illustrates components of an example secondary glazing apparatus; and FIGS. 3A, 3B and 3C illustrate an example assembly method for assembling a secondary glazing panel.

DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS OF THE INVENTION

FIGS. 1-2 illustrate different views of a cross-section through an example frame section 104 of a secondary glazing apparatus 100. FIGS. 3A-3C illustrate steps of assembling a secondary glazing panel 152. The frame section 104 is a panel rail forming part of a window frame. FIG. 2 further illustrates a pane 102 of glazing material, such as glass or laminate glass.

The length of the frame section 104 is represented by an x-axis. The width of the frame section 104 between a room interior side and a room exterior side (towards primary glazing) is represented by a y-axis. The height of the frame section 104 extending towards a pane of glazing material is represented by a z-axis.

Optionally, the frame section 104 has a continuously uniform cross-sectional area and geometry along its length, up to its end joints. For example, the frame section 104 can be an extruded profile having a fixed cross-sectional profile.

The cross-section shape and size of the frame section 104 is not limited to that shown. For example, the frame section geometry could depend on whether the secondary glazing panel 152 is: horizontal sliding; vertical sliding; hinged; fixed; lift-out; or bespoke.

The material of the frame section 104 is any type of material that should not be in direct contact with pane 102, to avoid edge damage to the pane 102. Optionally, the material of the frame section 104 comprises a metal such as aluminium. However, it would be appreciated that the invention could be implemented for frames comprising softer materials such as wood or a polymeric material such as polyvinyl chloride.

The frame section 104 may comprise fixing holes (not shown) configured to enable either a face fix or a reveal fix of the secondary glazing panel 152. A face fix comprises screwing the secondary glazing frame to a primary glazing frame. A reveal fix comprises screwing the secondary glazing frame onto the interior cill and plaster/jamb, leaving a gap of tens of millimetres between panes of the primary and secondary glazing panels.

The material of the frame section 104 may be continuous in the width dimension, without necessarily requiring a thermal break between the interior side of the pane 102 and the exterior side of the pane 102.

Unlike many types of primary glazing, the gaskets described herein are not overmolded and are added during assembly to the finished frame sections. Further, the gaskets hold the pane 102 in place without the need for additional packers.

The frame section 104 in FIGS. 1-2 comprises various channels in the length (x) axis, including a pane channel 112 configured to receive a pane 102 of glazing material. The frame section 104 may be a single-glazing frame section, having a single pane channel 112.

The pane channel 112 comprises a first channel side 114, a second opposite channel side 116, and a channel base 118 therebetween. For example, the pane channel 112 may be U-shaped.

The width of the pane channel 112 is sufficient to receive a first pane edge 120A of the pane 102. The first pane edge 120A refers to the 'thickness' face of the pane 102. The minimum width of the pane channel 112 may be a value selected from the range 1 millimetre greater than the width of the first pane edge 120A to less than double the thickness of the first pane edge 120A.

The frame section 104 and its pane channel 112 may have a length at least as long as the first pane edge 120A. As shown in FIGS. 3A-3C, frame sections 104, 106, 108, 110 may extend continuously along the pane edges and wrap around the pane 102 or panes of the secondary glazing panel 152.

The surfaces of the first channel side 114, the second channel side 116 and the channel base 118 may comprise metal. The pane 102 should not touch these surfaces.

The Figures illustrate a first, L-shaped gasket 122 and a second gasket 148 (e.g., wedge gasket) within the pane channel 112, to separate the pane 102 from the surfaces 114, 116, 118 of the pane channel 112. The first gasket 122 is described first.

The first gasket 122 comprises two main portions: a gasket side portion 124 and a gasket end portion 126.

The gasket side portion 124 is configured to protect a first major surface 128 of the pane 102 from the first channel side 114. The first major surface 128 refers to the front or rear face of the pane 102, occupying the x-z plane. The gasket side portion 124 can have a thickness in the order of 10^-1 or 101'0 millimetres to separate the first major surface 128 of the pane 102 from the first channel side 114.

The gasket end portion 126 is a leg extending approximately perpendicularly to the gasket side portion 124 and protects the first pane edge 120A from the channel base 118. The first pane edge 120A abuts or nearly abuts the gasket end portion 126. The gasket end portion 126 can have a thickness similar to that of the gasket side portion 124.

The first gasket 122 may comprise a polymeric material such as polyvinyl chloride material. The material properties may be selected to make the first gasket sufficiently flexible to achieve the functions described in this specification. Regardless of which material is used, a Shore D hardness of the first gasket 122 may be a value of at least 55 but less than 100, such as approximately 70.

The gasket side portion 124 and the gasket end portion 126 may be integrally extruded or coextruded to form an extruded first gasket 122. They may form an L-shape.

Further, the gasket end portion 126 is resiliently deformable to allow loose movement of the pane 102 in the x-z plane during assembly of the secondary glazing apparatus 100, until the wedge gasket 148 is pressed in.

This is achieved using a compressible cavity 130, such as an air pocket, between a face 132 of the gasket end portion 126 and the channel base 118.

The gasket end portion 126 can resiliently deform into the compressible cavity 130 if the pane 102 shifts during assembly or if the pane 102 not exactly square cut.

In the illustrated example, the compressible cavity 130 is an enclosed cavity.

The gasket end portion 126 may act as an at least partially effective seal, or the compressible cavity 130 may be unsealed.

In the illustrated example, the compressible cavity 130 is between the underside of the gasket end portion 126 and the channel base 118. In an alternative example, the compressible cavity 130 is substantially enclosed inside the gasket end portion 126. However, the illustrated implementation makes the first gasket 122 easier to manufacture and enables the first gasket 122 to have a lower profile height with better compression performance.

A portion of the illustrated gasket end portion 126 diverges away from the channel base 118 in the z-axis when viewed in the y-z cross-section plane, creating the compressible cavity 130 therebeneath. The illustrated gasket end portion 126 has a convex shape relative to the channel base 118. The gasket end portion 126 may be curved to define the convex shape. The gasket end portion 126 may be continuously curved, following an arc. The compressible cavity 130 may adopt a convex shape in the manner of a circle segment. In an implementation, the convex shape may have a diameter or circle equivalent diameter greater than the thickness of the pane 102, e.g., a diameter of the order 10^1 millimetres. This diameter creates the compressible cavity 130.

Although the illustrated channel base 118 is substantially flat, in other examples the channel base 118 may have a non-flat shape to provide at least part of the compressible cavity 130.

The convex shape extends across the width of the pane channel 112. The 15 convex shape may extend at least 80% of the width of the channel base 118. The channel base 118 may be wider than the thickness of the pane 102.

The gasket end portion 126 may meet the gasket side portion 124 at the corner 134 of the '12 shape of the first gasket 122. The corner 134 of the first gasket 122 may abut a first corner region 136 (first corner) of the channel base 118.

The gasket end portion 126 may extend all the way across the channel base 118 and abut the opposite, second corner region 138 (second corner) of the channel base 118.

The gasket end portion 126 may only touch the pane channel 112 at the first corner 136 and at the second corner 138. This maximises the width of the compressible cavity 130. The maximum width of the compressible cavity 130 may be at least approximately 80% of the width of the channel base 118, from the first corner 136 to the second corner 138.

Regarding the thickness of the compressible cavity 130, this depends on whether the gasket end portion 126 is resiliently deformed. When the gasket end portion 126 is in a neutral undeformed state as shown in the Figures, the compressible cavity 130 has a maximum thickness from the channel base 118 to a portion 140 of the gasket end portion 126. In FIG. 1, the portion 140 refers to the underside of the gasket end portion 126 at the apex of the convex shape.

The maximum thickness is approximately equal to or greater than an average thickness of the gasket end portion 126. The maximum thickness may be in the order of 10^-1 or 101'0 millimetres, but no less than 0.5 millimetres, for example.

If the gasket end portion 126 is resiliently deformed by the pane 102 during assembly, the portion 140 of the gasket end portion 126 shifts towards the channel base 118 to reduce the maximum thickness of the compressible cavity 130, until the portion 140 of the gasket end portion 126 contacts the channel base 118. This is achieved by selecting a sufficiently flexible material for the gasket end portion 126/first gasket 122.

FIG. 1 further illustrates a clip 142 configured to secure the first gasket 122 within the pane channel 112. Optionally, the clip 142 is a self-locking clip that engages without operator intervention when the operator has inserted the first gasket 122 into its operating position. The self-locking clip 142 may secure the first gasket 122 against movement in the z-axis. The clip 142 is useful to prevent the first gasket 122 from falling out before the pane 102 and wedge gasket 148 have been inserted. This facilitates cutting of mitre joints 154 (FIG. 3A) while the first gasket 122 is already inserted, to ensure that the first gasket 122 is not too long or short and mates accurately at the joints.

In order to provide the illustrated self-locking clip 142, the first channel side 114 comprises an undercut 144. The surface of the gasket side portion 124 that faces the first channel side 114 comprises a corresponding lip 146 configured to fit within the undercut 144. The undercut 144 and/or the lip 146 may extend continuously or discontinuously for a length at least as long as the first pane edge 120A.

The interior angle of the undercut 144 may be substantially a right angle or an acute angle. The exterior angle of the lip 146 may be 360 -the interior angle of the undercut 144, so that the lip 146 is securely retained by the undercut 144. Once clipped in place, the first gasket 122 may be compressed in the z-axis between the undercut 144 and the channel base 118 to provide additional frictional resistance to sliding in the x-axis.

Optionally, the second channel side 116 can comprise the same undercut 144 as the first channel side 114, so that the first gasket 122 can alternatively be clipped in place facing the opposite direction FIG. 2 further illustrates the wedge gasket 148 to be inserted into the pane channel 112 after the pane 102 of glazing material to immobilise the pane 102. The wedge gasket 148 may comprise any suitable non-overmolded gasket. The wedge gasket 148 is configured to separate a second major surface 150 of the pane 102 from the second channel side 116. The second major surface 150 is opposite the first major surface 128.

In other implementations, the wedge gasket 148 could be replaced by another means for achieving the same effect, such as a bead of polyvinyl chloride or alum inium.

FIGS. 3A-3C illustrate steps A-I of an example wrap around assembly method for assembling a secondary glazing panel 152 out of a rectilinear pane(s) 102 of glazing material and frame sections 104, 106, 108, 110 having the features defined above.

The resulting secondary glazing panel 152, as shown in FIGS. 3B-3C, comprises a first frame section 104 for a first pane edge 120A of a pane arrangement of one or more panes 102 of glazing material, a second frame section 106 for a second pane edge 120B of the pane arrangement, a third frame section 108 for a third pane edge 120C of the pane arrangement, and a fourth frame section 110 for a fourth pane edge 120D of the pane arrangement. The pane edges may be edges of a same pane 102, or edges of different panes if the secondary glazing panel 152 is the sliding type with multiple panes.

The method steps can be performed in any order except where a particular order is explicitly required Some method steps can be omitted, depending on the implementation of the secondary glazing panel 152.

Step A comprises providing an uncut length of frame section profile 1040 (e.g., metal extrusion). The uncut lengths may be several metres as standard, needing to be cut down into frame sections 104, 106, 108, 110 to meet the customer's requirements.

Step B comprises inserting an uncut length of the first gasket 122 into the uncut length of frame section profile 1040. The first gasket 122 may be clipped into place using the self-locking clip feature 142.

Step C comprises cutting the uncut length(s) of frame section profile 1040 into the first, second, third and fourth frame sections 104, 106, 108, 110, for example using a saw. The cutting operation may comprise cutting diagonal mitre joints 154. A single cutting operation also cuts the first gasket 122 at the diagonal mitre joints 154 to ensure a good seal at the corners.

Step D comprises mating the first pane edge 120A with the pane channel 112 of the first frame section 104, while the first gasket 122 but not the wedge gasket 148 is within the pane channel 112 of the first frame section 104.

Once the first pane edge 120A has been inserted into the pane channel 112 of the first frame section 104, Step E comprises mating the second pane edge 120B with the pane channel 112 of the second frame section 106, while a length of the first gasket 122 but not the wedge gasket 148 is within the frame channel of the second frame section 106.

Step E further comprises securing the first frame section 104 and second frame section 106 to each other at mitre joints 154, for example using fasteners 156 (e.g., screws) or integral crimps. During this time, the pane 102 is 'floating' and able to translate in two dimensions in the x-z plane, with the assistance of the compressible cavities 130.

Step F comprises mating the third pane edge 120C with the pane channel 112 of the third frame section 108, while a length of the first gasket 122 but not the wedge gasket 148 is within the frame channel of the third frame section 108.

Step F further comprises securing the third frame section 108 to the exposed end of the first or second frame section 104, 106, for example at mitre joints 154. A similar method of securing may be used as Step E. During this time, the pane 102 is still floating.

Step G comprises mating the fourth pane edge 120D with the pane channel 112 of the fourth frame section 110, while a length of the first gasket 122 but not the wedge gasket 148 is within the frame channel of the fourth frame section 110.

Step G further comprises securing the fourth frame section 110 to the exposed ends of the third and first frame sections 108, 104 or third and second frame sections 108, 106, for example at mitre joints 154. A similar method of securing may be used as steps E and F. During this time, the pane 102 is still floating even though it has been fully wrapped and enclosed by frame sections 104, 106, 108, 110. This is facilitated by the compressible cavities 130 at all four sides of the pane 102.

Up to this point, substantially no stress has been placed on the pane 102, which is in contrast to the background method explained at the beginning of the specification.

If fasteners 156 are used to secure the frame sections 104, 106, 108, 110 to each other, Step H comprises tightening the fasteners 156 which initially were not tightened to their final tightness (torque). The fasteners 156 at each mitre joint 154 are tightened to the final tightness. Even after this tightening operation, the pane 102 is still floating within the frame, by compressing the compressible cavities 130. The compressible cavities 130 and gasket end portions 126 act as compressible springs to self-centre the pane 102 and impart substantially no stress on the pane 102.

Step I comprises inserting lengths of wedge gasket 148 into each frame section 104, 106, 108, 110 to immobilise the pane 102 in a required position. The wedge gasket 148 may be inserted by force applied in the z-axis, normal to the length of the wedge gasket 148 and frame section 104, 106, 108, 110, to minimise friction damage or stretching of the wedge gasket 148.

The examples described herein provide an environmental benefit by reducing wastage. The reduced wastage is enabled by encountering fewer stress-related breakages and by being able to work with out-of-square glass panes without rejecting the panes. A further environmental benefit is that the thermal seal is improved due to the improved method of cutting and securing the gaskets.

Although embodiments of the present invention have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the examples given can be made without departing from the scope of the invention as claimed.

Features described in the preceding description may be used in combinations other than the combinations explicitly described.

Although functions have been described with reference to certain features, those functions may be performable by other features whether described or not.

Although features have been described with reference to certain embodiments, those features may also be present in other embodiments whether described or not.

Whilst endeavoring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.

I/we claim:

Claims

CLAIMS1. A secondary glazing apparatus (100) comprising: a pane (102) of glazing material; a frame section (104) comprising a pane channel (112), the pane channel comprising a first channel side (114), a second channel side (116) and a channel base (118), the pane channel having a width to receive a first pane edge (120) of the pane, and having a length at least as long as the first pane edge; a first gasket (122) within the pane channel, wherein the first gasket comprises: a gasket side portion (124) configured to separate a first major surface (128) of the pane from the first channel side; and a gasket end portion (126) configured to separate the first pane edge from the channel base, wherein the gasket end portion and/or the channel base is configured so that a compressible cavity (130) is provided between a face (132) of the gasket end portion and the channel base.
2. The secondary glazing apparatus of claim 1, wherein the gasket end portion has a convex shape relative to the channel base, wherein the convex shape extends across the width of the pane channel, and wherein the compressible cavity comprises an air pocket between the convex shape and the channel base.
3. The secondary glazing apparatus of claim 1 or 2, wherein the gasket end portion and the gasket side portion meet at a corner (134) of the first gasket abutting a first corner region (136) of the channel base, and wherein the gasket end portion extends across the width of the pane channel to substantially abut a second opposite corner region (138) of the channel base.
4. The secondary glazing apparatus of any preceding claim, wherein a maximum width of the compressible cavity is at least approximately 80% of a width of the channel base.
5. The secondary glazing apparatus of any preceding claim, wherein when the gasket end portion is in a neutral undeformed state, the compressible cavity has a maximum thickness from the channel base to a portion (140) of the gasket end portion, wherein the maximum thickness is approximately equal to or greater than an average thickness of the gasket end portion, and wherein the gasket end portion is configured to be sufficiently resiliently deformable that the maximum thickness of the compressible cavity is reducible until the portion of the gasket end portion contacts the channel base.
6. The secondary glazing apparatus of any preceding claim, wherein the first gasket is an extruded gasket integrating the gasket side portion and the gasket end portion.
7. The secondary glazing apparatus of any preceding claim, wherein the gasket side portion and the gasket end portion together approximately form an L20 shape.
8. The secondary glazing apparatus of any preceding claim, wherein the pane channel and the first gasket and the compressible cavity are at least as long as the first pane edge.
9. The secondary glazing apparatus of any preceding claim, wherein the first gasket comprises a polymeric material and/or wherein the first gasket has a Shore D hardness of at least 55.
10. The secondary glazing apparatus of any preceding claim, comprising a self-locking clip (142) configured to secure the first gasket within the pane channel.
11. The secondary glazing apparatus of claim 10, wherein the self-locking clip is provided by a combination of an undercut (144) in the first channel side and a corresponding lip (146) in the gasket side portion to engage with the undercut.
12. The secondary glazing apparatus of claim 11, wherein the second channel side comprises an undercut (144) so that the first gasket can be clipped to the pane channel facing a first direction and can be clipped to the pane channel facing a second opposite direction.
13. The secondary glazing apparatus of any preceding claim, wherein the frame section comprises metal.
14. The secondary glazing apparatus of claim 13, wherein the metal comprises alum inium.
15. The secondary glazing apparatus of any preceding claim, wherein the frame section is an extruded frame section.
16. The secondary glazing apparatus of any preceding claim, wherein the frame section is a single-glazing frame section.
17. The secondary glazing apparatus of any preceding claim, wherein the frame section comprises mitre joints (154) at end portions thereof.
18. The secondary glazing apparatus of any preceding claim, comprising a second, wedge gasket (148) within the pane channel, wherein the wedge gasket is configured to separate a second major surface (150) of the pane opposite the first major surface of the pane, from the second channel side of the pane channel of the frame section.
19. A secondary glazing panel (152) comprising a first frame section (104) for a first pane edge (120A) of a pane arrangement of one or more panes of glazing material, a second frame section (106) for a second pane edge (120B) of the pane arrangement, a third frame section (108) for a third pane edge (120C) of the pane arrangement, and a fourth frame section (110) for a fourth pane edge (120D) of the pane arrangement, wherein each of the first, second, third and fourth frame sections comprises a pane channel as claimed in any preceding claim within which is a first gasket as claimed in any preceding claim, the length of each pane channel being at least as long as each corresponding pane edge.
20. A method of wrap around assembly of the secondary glazing panel as claimed in claim 19, the method comprising: mating (D) the first pane edge with the pane channel of the first frame section within which is a length of the first gasket; mating (E) the second pane edge with the pane channel of the second frame section within which is a length of the first gasket; securing (E) the first frame section and second frame section to each other; mating (F) the third pane edge with the pane channel of the third frame section within which is a length of the first gasket; securing (F) the third frame section to the first or second frame section; mating (G) the fourth pane edge with the pane channel of the fourth frame section within which is a length of the first gasket; and securing (G) the fourth frame section to the third and first or second frame sections.
21. The method of claim 20, comprising initially cutting (C) one or more uncut lengths of frame section profile (1040) into the respective first, second, third and fourth frame sections, after insertion (B) of the first gasket into a pane channel (122) of the uncut length of frame section profile so that the cutting operations also cut the first gasket.
22. The method of claim 20 or 21, further comprising inserting (I) a wedge gasket as claimed in claim 18 into each frame section to immobilise the pane arrangement, after the securing of the fourth frame section.
23. The method of claim 22, wherein the frame sections are secured to each other by fasteners (156), and wherein the method comprises: tightening (H) the fasteners to a final tightness after the securing of the fourth frame section, wherein after the fasteners have been tightened to the final tightness, the pane arrangement is floating within the assembled frame sections and able to translate by compressing the compressible cavities, and wherein the subsequent insertion of the wedge gasket immobilises the pane arrangement.
24. A secondary glazing apparatus (100) comprising: a frame section (102) comprising a pane channel (112), the pane channel comprising a first channel side (114), a second channel side (116) and a channel base (118), the pane channel having a width to receive a first pane edge (120) of a pane of glazing material, and having a length of at least tens of centimetres; a first gasket (122) within the pane channel, wherein the first gasket comprises: a gasket side portion (124) configured to separate a first major surface (128) of the pane from the first channel side; and a gasket end portion (126) configured to separate the first pane edge from the channel base, wherein the gasket end portion and/or the channel base is configured so that a compressible cavity (130) is provided between a face (132) of the gasket end portion and the channel base.