GB2244730A

GB2244730A - Roof eaves ventilator

Info

Publication number: GB2244730A
Application number: GB9012442A
Authority: GB
Inventors: James Mcgrory
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-06-04
Filing date: 1990-06-04
Publication date: 1991-12-11
Also published as: GB9012442D0

Abstract

An angled roof eaves ventilator has limbs 4, 5 of different length to permit differing amounts of ventilation. <IMAGE>

Description

MULTI-PURPOSE ROOF EAVES VENTILATION MEMBER Technical Field This Invention relates to a multi-purpose ventilation member for installation in the eaves of a building roof.

Background Current Building Regulations and Acts require that the space between the waterproof membrane and insulation layer in roofs must be vertii- ated to certain standards to discourage condensation in the structure and on the inside surfaces of the building. It is required that sufficient ventilation space be provided to equate to a continuous uninterrupted gap of mien. 10 mm wide (or, in some circumstances, min. 25 mm will along the overall length of the eaves.

It is also desirable that such ventilation space be screened or otherwise protected against the entry into the roof space of stall birds or large insects.

Such products as are currently on the market generally provide only the equivalent of 10 m.m of ventilation, or are relatively expensive, or require to be fitted i:- the scffit of the roof, or are not structurally self-supporting, or require relatively complex installation procures.

Technical Features of this Invention This Invention is a continuous member, roughly "L"-shaped. in section, formed from. a narrow strip of flat metal sheet made of corrosion- resistant metal or metal treated or plated to be corrosion-resistant.

The flat metal strip is profiled along its length to give the complex "L"-section, by being twice-bent along each edge and thrice-bert along a line approximately two-thirds of the width, to give the required complex unequal angular section.

Both legs of the "L" section or angle are wholly or partly perforate by the process of incising staggered slits lengthwise and drawing or expanding crosswise across the strip to give a "ciam.ond"-mesh pattern of holes.

The finished member, when fitted in or about the eaves of flat roofs or pitched roofs of any pitch, in roofs of any normal type of covering material, will afford eaves ventilation equivalent to either a 10 mm wide or a 25 mm wide continuous gap along the length of the eaves.

The finished member will be capable of supporting normal working loads imposed by eaves elements, along the axes of both legs of the angle, and at 45 to those axes, when the member is fixed across a span of up to 600 mm.

The mesh will be so dimensioned as to prohibit the passage of birds and large insects.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows in perspective a section of the roof eaves ventilation angle member, in itself.

Figures 2 - 10 show, in section, sample applications of the member, as follows: Fig. 2: mounted on the wall-hea. of a slate or tile roof of 15 + in pitch Fig. 3: mounted at the foot of the rafters of a slate or tile roof of 15 + in pitch, where the line of the ceiling follows the line of the pitch of the roof Fig. 4: mounted under the fascia of a slate or tile roof of 1a + in pitch Fig. 5: mounted over the fascia of a slate or tile roof of 15 + in pitch, where the line of the ceiling follows the line of the pitch cf the roof Fig. 6: mounted on the edges of a valley gutter to offer ventil- action requirements equal to 25 mm and 10 mm continuous gap Fig. 7: mounted on the wall-head of a built-up roof deck of less than 15 in pitch Fig. 8: mounted on the wall-head of a profiled-sheet roof of less than 15 in pitch Fig. 9: mounted under the fascia of a flat roof Fig. 10: mounted on the wall-head of z flat roof Referring to the drawings, a section of the ventilation angle member itself is shown in Fig. 1 with the body of the metal strip 1 twicebent along both edges 2 to increase rigidity and to avoid damage to the underslate felt. The metal strip is alse thrice bent to an elbow 3 along its length to give a more rigid angle section of unequal leg lengths. The legs of the angle are wholly or partly perforated in diamond mesh of a single mesh size but to different widths to yield a ventilation area of approx 3c,ociO mv2ilnr..m. 4 and a ventilation area of approx 12,000 mm2/lin.m. 5.

In Figs. 2 - 10 the ventilation angle member 6 is showr. installed under the underslate felt7and above or below the fascia 11 of tile or slate roofs 10, beneath the roof decking of built-up roofing 8 and profile sheet roofing 9, and behind the fascia 11 or fascia bearers 12 of flat roofs.

In most of the illustrations in Figs. 2 - 10 the ventilation angle member is fully reversible to give the greater or lesser ventilation requirement.

Claims

1. A roof eaves ventilation angle member comprising a single complex perforated metal angle which is reversible to permit

AtWO fixed and different amounts of ventilation when it is installed in or about the eaves of a building roof.

2. A roof eaves ventilation angle member as claimed in Claim 1 wherein the ventilation openings are screened to prohibit the passage of birds and large insects.

3. A roof eaves ventilation angle member as claimed in Claim 1 or Claim 2, wherein the member is constructed of corrosion resistant metal or metal treated or plated to be corrosion resistant.

4. A roof eaves ventilation angle member as claimed in any preceding Claim wherein the member can be used to satisfy all the require ments of current Building Acts and Regula'ions in respect of roof eaves ventilation.

5. A roof eaves ventilat-or angle member as claimed in any preceding Claim wherein the member can be Installec. in or about the eaves of pitched roofs of more ta 15 of pito to give ventil ation equivalent to 2 continuous gap of 10 mm wide along the length of the roof eaves.

7. A roof eaves ventilation angle ember as claimed. in any preceding Claim wherein the member can be installed in or about the eaves of pitched roofs of less than 15 of pitch to give ventil- ation equivalent to a continuous gap of 25 mm wide along the length cf the roof eaves.

8. A roof eaves ventilation ahgle member as claimed in any preceding Claim wherein the member can be installed in or about the eaves of flat roofs to give ventilation equivalent to a continuous gap of 25 mm wide along the length of the roof eaves.

9. A roof eaves ventilation angle member as claimed in any preceding Claim which is suitable for installation in roofs covered in slate or synthetic slates.

10. A roof eaves ventilation angle member as claimed in any preceding.

Claim which is suitable for installation in roofs covered in plain and profiled tiles, or tiles of stone or synthetic stone.

11. A roof eaves ventilation angle member as claimed in any preceding Claim which is suitable for installation in roofs covered in built-up sheathing.

12. A roof eaves ventilation angle member as claimed. in any preceding Claim which is suitable for installation in roofs covered in profiled-sheet sheathing.

13. A roof eaves ventilation angle member as claimed in any preceding Claim wherein the member will support the working loads imposed by the roof covering.