GB1579550A

GB1579550A - Sealing strip for a ridge or hip covering

Info

Publication number: GB1579550A
Application number: GB4509577A
Authority: GB
Original assignee: Redland Roof Tiles Ltd
Current assignee: Redland Roof Tiles Ltd
Priority date: 1976-10-29
Filing date: 1977-10-28
Publication date: 1980-11-19
Also published as: DK479677A; DE2649790B2; FR2369394B1; AT349706B; DE2649790A1; DK145105C; NL7711857A; DK145105B; CH622306A5; ATA748177A; FR2369394A1; IT1116141B; DE2649790C3; NL171734B; BE860118A

Abstract

For reliable sealing of the ridge or arris of a ridge or arris covering, with good ventilation of the roof interior, the invention provides an adapted sealing strip (8, 11), any length of which can be rolled up and which can be laid continuously over the entire length of the roof. The sealing strip comprises two flat, flexible strips which are located one above the other, are connected to each other in the region of their longitudinal centre line and the lower strip (8) of which has ventilation openings (10) and consists of flexurally soft material, with the result that its longitudinal edges rest on the roofing slabs (3). The upper strip (11) consists of a harder material and projects, in the manner of a canopy, beyond the ventilation openings (10) in the lower strip (8). <IMAGE>

Description

(54) SEALING STRIP FOR A RIDGE OR HIP COVERING (71) We, REDLAND ROOF TILES LIMITED, a British Company, of Redland House, Castle Gate, Reigate, Surrey, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a tiled roof and more particularly to a tiled roof having a ridge or hip covering comprising covering caps fastened to a ridge or hip board and forming the upper covering of the ridge or hip, and a sealing strip which is arranged between the caps and the roofing tiles on both sides of the ridge or hip board and which has longitudinal edge portions which rest on the roofing tiles.

A known sealing means for a tiled roof of this type consists of essentially rigid U-section insert in whose lateral portions there are formed ventilation apertures. As a result of its U-shaped profile it is not possible for the known insert to be rolled up and, therefore, it has to be supplied in sections of limited length, normally with a length of 1 m. Of course, a plurality of these inserts are required to cover a roof so that it is necessary for the adjacent inserts to be sealed in relation to one another.

The invention provides a tiled roof having a ridge or hip covering comprising covering caps fastened to a ridge or hip board of the roof structure and forming the upper covering of the ridge or hip and a sealing strip which is arranged between the caps and the roofing tiles on both sides of the ridge or hip board and which has longitudinal edge portions which rest on the roofing tiles, in which the sealing strip comprises two layers, an upper layer of relatively inflexible material and a lower layer of relatively flexible material, said upper and lower layers being joined together only in the region of the longitudinal centre of the strip means, ventilation apertures being formed in the lower layer on at least one side of the ridge or hip and the width of the upper layer being sufficient to cover the ventilation apertures.

Further features and advantages of the sealing strip provided for a tiled roof according to the invention will become apparent from the following description, by way of example, of a preferred embodiment of the invention the description being read with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic sectional view of a ridge or hip covering with a sealing strip provided in a tiled roof in accordance with the invention; Figure 2 is a diagrammatic view in perspective of the sealing strip of Figure 1 which is partly laid out and partly rolled up on the ridge board of the roof; Figure 3 is a diagrammatic view in perspective of a portion of the sealing strip of Figure 1 laid out on the ridge board of the roof and with the covering caps arranged thereover; and Figure 4 is a diagrammatic view in perspective of a ridge or hip covering in which the sealing strip of Figure 1, is arranged beneath partly overlapping covering caps in the form circular segments.

A sealing strip provided in a tiled roof is as shown in the drawings, has at least the following features: a) the sealing strip is made in two layers with an upper strip or layer of relatively inflexible (hard) material and a lower strip or layer of relatively flexible (soft) material; b) both strips are joined together only in the region of the longitudinally extending strip centre; c) ventilation apertures are formed in the lower strip in at least one strip half, and d) the width of the upper strip is sufficient to cover the ventilation apertures.

Both strips preferably consist of a weather-proof and ageing-resistant organic plastics material; suitable materials are polyethylene or polyvinyl chloride for example, polyvinyl chloride preferably being used.

Both strips have such a degree of flexibility that the sealing strip can be rolled up into a roll. Furthermore, the upper strip has such a small degree of flexibility, that the upper strip is practically self-supporting and does not noticeably sag downwards due to its own weight when the upper strip is supported only in the region of the strip centre. The desired effect is that the upper strip resting roof-like on the ridge board projects beyond the longitudinal edges of the ridge board and does not sag downwardly merely due to its weight. The lower strip is intended to be so soft or flexible that it sags downwards due to its own weight and rests on the roofing tiles or slabs at least with its longitudinal edges, and comes into close contact with the surface of said slabs to form a seal.In a preferred embodiment the upper strip consists of relatively inflexible PVC and the lower strip consists of relatively flexible PVC, the relative flexibility of the two strips being determined by the plasticizer content of the PVC. When using other plastics it is easily possible to adjust the required flexibility of the upper and lower strips by corresponding choice of material, by appropriate thickness of the two strips and/or by different plasticizer content in the two strips. In a preferred embodiment, the thickness of the lower strip is between 1.0 mm and 1.4 mm and that of the upper strip between 0.5 mm and 1.0 mm. The upper strip is joined to the lower strip solely in the region of the longitudinally extending strip centre of the sealing strip. The connection may be effected by means of an adhesive or the like.Preferably, both strips are welded together in the connection zone. The connecting zone should only be of such a size as to ensure a reliable bond between the two strips, without appreciably affecting the ability of the lower strip to droop downwards; a connecting zone is particularly suitable having a width of about 5 to 20 mm.

Ventilation apertures are formed in the lower strip. In many cases it may be adequate to provide ventilation apertures only in one half of the lower strip. Preferably, however, ventilation apertures are formed in both halves of the lower strip. By way of example the ventilation apertures correspond to circular openings with a diameter of about 15 to 30 mm.

The ventilation apertures are preferably disposed parallel to the strip centre of the lower strip and spaced apart therefrom.

The upper strip rests on the lower strip and is joined thereto solely in the region of the longitudinally extending strip centre of the sealing strip. The width of the upper strip which is preferably between 80 mm and 120 mm must be sufficient to cover the ventilation apertures in the lower strip the width of which is preferably between 220 mm and 260 mm when both strips are placed flat on a horizontal support. Accordingly, it is advantageous to arrange the ventilation apertures outside the connecting zone but not too far distant from the strip centre, so that even with a moderate width of the upper strip reliable covering of the ventilation apertures is ensured.

Markings are applied on to the top side of the upper strip, preferably along the longitudinally extending strip centre of the sealing strip. These markings facilitate the laying and fixing of the sealing strip parallel and centrally to the ridge board. In the simplest case these markings may comprise weld seams or impressed notches.

Further details are indicated below in tabular form for the preferred embodiment of the sealing strip shown in the drawings.

Dimensions of the preferred sealing strip: Sealing strip length about 15 M Upper strip: material hard PVC Width 100 mm Thickness 0.7 mm Lower strip: Material soft PVC Width 240 mm Thickness 1.2 mm Ventilation apertures: Circular, diameter 20 mm Distance from centre line 20 mm, approximately The sealing strip illustrated is to a large extent adapted to the different requirements of the ridge or hip covering for roofs tiled with roofing slabs. The use of this sealing strip is particularly advantageous in conjunction with flat roofing slabs, since in this case the two longitudinally extending edge portions of the lower strip are applied flush against the roofing slabs. A suitable roofing consists, for example, of flat roofing slabs provided with grooves in the connecting zone, or of plain tiles.In view of the fact that in the ridge or hip covering the upper essentially horizontal strip overlaps in roof-like fashion the ventilation apertures in the lower strip, narrow joints can be tolerated between adjacent covering caps; accordingly, the covering caps may thus be fitted to abut against one another. Moreover, the sealing strip is also suitable for a ridge or hip covering in association with circular segmental covering caps which are laid with partial overlap.

The ridge or hip covering is described below with particular reference to Figures 1 to 4.

As illustrated in Figure 1 for example, roof battens 2 are fastened to rafters 1, said battens in turn supporting the roof slabs or tiles 3. Also fastened to the rafters I is a ridge-board support 4 whose upper portion 5 has a U-shaped attachment 6 for accommodating a ridge board 7. The lower strip 8 of the sealing strip is placed on the ridge board 7. On either side of the ridge board 7, the lower strip 8 droops downwards in its unsupported region and rests with its longitudinal edge portions 9 flush against the flat surface of the roofing slabs 3. Ventilation apertures 10 are situated in the lower strip 8 laterally in relation to the ridge board and ensure satisfactory ventilation of the roof space, as indicated by the arrows. The upper strip 11 is joined to the lower strip 8, said upper strip overlapping the ventilation apertures 10 in the manner of a roof.Circular segmental covering caps 12 serve to complete the ridge or hip covering and are secured to the ridge board 7 at intervals by means of engaging clips or clamps 13. As illustrated, the width of the upper strip 11 may be chosen so that the latter is resiliently applied with its two longitudinal edges against the inside of the covering cap 12.

Figure 2 illustrates a preliminary stage in the operation of covering the ridge or hip. The sealing strip is supplied in practically endless length in the form of a roll 14. This roll 14 is unrolled on to the ridge board 7 and the sealing strip is secured using fastening means, such as nails 15, which are driven into the ridge board 7. Once again it is clearly shown that the longitudinal edges 9 of the lower strip 8 are applied flush against the flat surface of the roofing slabs 3, whereas the ventilation apertures 10 are covered by the upper strip 11 which projects in the manner of a roof. Along the top side of the upper strip 11 there is a marking 16 along which the fastening means 15 are driven in. The marking is formed by the weld joining the upper and lower layers of the sealing strip together.

As shown in Figure 3, another form of covering cap 17 is arranged over the partly laid sealing strip. This covering cap 17 is designed to be laid in abutment against adjoining covering caps 17; to ensure adequate ventilation they are provided with recesses 18 in both longitudinal edges. As also indicated by the arrows, the air entering and leaving the roof space follows a labyrinth-like path which reliably prevents the ingress of rain, driving snow, dust and the like into the roof space.

In the embodiment illustrated in Figure 4 plain tiles are used as roofing slabs 3. The covering caps 12 have circular segmental cross-section and are laid partly overlapping. This partial overlap ensures adequate ventilation of the roof space even in the case of the covering caps 12 having straight longitudinal edges. The longitudinal edges of the upper strip 11 are applied resiliently against the inside of the covering caps 12; the upper strip 11 overlaps in roof-like fashion the ventilation apertures 10 in the lower strip 8, so that satisfactory ventilation of the roof space may take place.

WHAT WE CLAIM IS: 1. A tiled roof having a ridge or hip covering comprising covering caps fastened to a ridge or hip board of the roof structure and forming the upper covering of the ridge or hip and a sealing strip which is arranged between the caps and the roofing tiles on both sides of the ridge or hip board and which has longitudinal edge portions which rest on the roofing tiles, in which the sealing strip comprises two layers, an upper layer of relatively inflexible material and a lower layer of relatively flexible material, said upper and lower layers being joined together only in the region of the longitudinal centre of the strip means, ventilation apertures being formed in the lower layer on at least one side of the ridge or hip and the width of the upper layer being sufficient to cover the ventilation apertures.

2. A tiled roof as claimed in claim 1, in which ventilation apertures are formed in the lower layer on both sides of the ridge or hip.

3. A tiled roof as claimed in claim 1 or claim 2 in which the upper layer consists of relatively inflexible polyvinyl chloride.

4. A tiled roof as claimed in any one of the preceding claims in which the lower layer consists of relatively flexible polyvinylchloride which contains more plasticiser than the upper layer.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. The sealing strip illustrated is to a large extent adapted to the different requirements of the ridge or hip covering for roofs tiled with roofing slabs. The use of this sealing strip is particularly advantageous in conjunction with flat roofing slabs, since in this case the two longitudinally extending edge portions of the lower strip are applied flush against the roofing slabs. A suitable roofing consists, for example, of flat roofing slabs provided with grooves in the connecting zone, or of plain tiles.In view of the fact that in the ridge or hip covering the upper essentially horizontal strip overlaps in roof-like fashion the ventilation apertures in the lower strip, narrow joints can be tolerated between adjacent covering caps; accordingly, the covering caps may thus be fitted to abut against one another. Moreover, the sealing strip is also suitable for a ridge or hip covering in association with circular segmental covering caps which are laid with partial overlap. The ridge or hip covering is described below with particular reference to Figures 1 to 4. As illustrated in Figure 1 for example, roof battens 2 are fastened to rafters 1, said battens in turn supporting the roof slabs or tiles 3. Also fastened to the rafters I is a ridge-board support 4 whose upper portion 5 has a U-shaped attachment 6 for accommodating a ridge board 7. The lower strip 8 of the sealing strip is placed on the ridge board 7. On either side of the ridge board 7, the lower strip 8 droops downwards in its unsupported region and rests with its longitudinal edge portions 9 flush against the flat surface of the roofing slabs 3. Ventilation apertures 10 are situated in the lower strip 8 laterally in relation to the ridge board and ensure satisfactory ventilation of the roof space, as indicated by the arrows. The upper strip 11 is joined to the lower strip 8, said upper strip overlapping the ventilation apertures 10 in the manner of a roof.Circular segmental covering caps 12 serve to complete the ridge or hip covering and are secured to the ridge board 7 at intervals by means of engaging clips or clamps 13. As illustrated, the width of the upper strip 11 may be chosen so that the latter is resiliently applied with its two longitudinal edges against the inside of the covering cap 12. Figure 2 illustrates a preliminary stage in the operation of covering the ridge or hip. The sealing strip is supplied in practically endless length in the form of a roll 14. This roll 14 is unrolled on to the ridge board 7 and the sealing strip is secured using fastening means, such as nails 15, which are driven into the ridge board 7. Once again it is clearly shown that the longitudinal edges 9 of the lower strip 8 are applied flush against the flat surface of the roofing slabs 3, whereas the ventilation apertures 10 are covered by the upper strip 11 which projects in the manner of a roof. Along the top side of the upper strip 11 there is a marking 16 along which the fastening means 15 are driven in. The marking is formed by the weld joining the upper and lower layers of the sealing strip together. As shown in Figure 3, another form of covering cap 17 is arranged over the partly laid sealing strip. This covering cap 17 is designed to be laid in abutment against adjoining covering caps 17; to ensure adequate ventilation they are provided with recesses 18 in both longitudinal edges. As also indicated by the arrows, the air entering and leaving the roof space follows a labyrinth-like path which reliably prevents the ingress of rain, driving snow, dust and the like into the roof space. In the embodiment illustrated in Figure 4 plain tiles are used as roofing slabs 3. The covering caps 12 have circular segmental cross-section and are laid partly overlapping. This partial overlap ensures adequate ventilation of the roof space even in the case of the covering caps 12 having straight longitudinal edges. The longitudinal edges of the upper strip 11 are applied resiliently against the inside of the covering caps 12; the upper strip 11 overlaps in roof-like fashion the ventilation apertures 10 in the lower strip 8, so that satisfactory ventilation of the roof space may take place. WHAT WE CLAIM IS:

1. A tiled roof having a ridge or hip covering comprising covering caps fastened to a ridge or hip board of the roof structure and forming the upper covering of the ridge or hip and a sealing strip which is arranged between the caps and the roofing tiles on both sides of the ridge or hip board and which has longitudinal edge portions which rest on the roofing tiles, in which the sealing strip comprises two layers, an upper layer of relatively inflexible material and a lower layer of relatively flexible material, said upper and lower layers being joined together only in the region of the longitudinal centre of the strip means, ventilation apertures being formed in the lower layer on at least one side of the ridge or hip and the width of the upper layer being sufficient to cover the ventilation apertures.

5. A tiled roof as claimed in any one of claims 1 to 4, in which both layers exhibit such

flexibility that the sealing strip can be rolled up into a roll.

6. A tiled roof as claimed in any one of the preceding claims in which an uninterrupted sealing strip extends over the entire length of the roof.

7. A tiled roof as claimed in any one of the preceding claims in which the width of the lower layer is greater than the width of the upper layer.

8. A tiled roof as claimed in claim 7, in which the width of the lower layer is between 220 and 260 mm.

9. A tiled roof as claimed in claim 8 in which the width of the lower layer is 240 mm.

10. A tiled roof as claimed in claim 7, in which the width of the upper layer is between 80 and 120 mm.

11. A tiled roof as claimed in claim 10 in which the width of the upper layer is 100 mm.

12. A tiled roof as claimed in any one of the preceding claims in which the thickness of the lower layer is between 1.0 mm. and 1.4 mm., and the thickness of the upper layer is between 0.5 and 1.0 mm.

13. A tiled roof as claimed in claim 12 in which the thickness of the lower layer is 1.2 mm. and the thickness of the upper layer is 0.7 mm.

14. A tiled roof as claimed in any one of the preceding claims in which a marking is formed on the top side of the upper strip layer along the centre line extending in the longitudinal direction of the sealing strip.

15. A tiled roof as claimed in claim 14, in which the marking takes the form of a weld seam.

16. A tiled roof substantially as hereinbefore described with reference to and as shown in the accompanying drawings.

17. A sealing strip for a tiled roof substantially as hereinbefore described with reference to and as shown in the accompanying drawings.