GB2193515A

GB2193515A - Roof space ventilator

Info

Publication number: GB2193515A
Application number: GB08619482A
Authority: GB
Inventors: Kenneth Douglas James
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-08-09
Filing date: 1986-08-09
Publication date: 1988-02-10
Anticipated expiration: 2006-08-09
Also published as: GB2193515B; GB8619482D0

Abstract

A ventilator for ventilating a roof space through the lining felt laps of a tiled or slated roof, has a member 1 to hold the layers of felt 5 apart at their overlaps and permit a limited flow of air through it. The ventilator has means 4 to hold it in position and to hold the felt close to the ventilator and with means 2 to prevent access of larger insects. Figs. 1 and 6 show two configurations for the ventilator. A variety of alternative configurations are also described. <IMAGE>

Description

SPECIFICATION Roof space ventilator This invention relates to a ventilator for ventilating the roof space beneath a tiled or slated roof, which is felted beneath the tiles or slates.

The increased risk of condensation in roofs of buildings, brought about by reduced heat and ventilation to roof spaces, has led to the use of various eaves, ridge, tile and other ventilators and, as a consequence of the thicker insulation used, trays laid between rafters to maintain air routes. Building Regulations require such ventilation as these devices have attempted to provide and which have answered the problems for new simple rectangular roofs with insulation at ceiling level. However, roofs complicated by valleys, hips reduced eaves length, dormers, rooflights and other trimmings and particularly in roofs with rooms in them where ceilings follow the roof slope, render those devices unsuitable.Their use can also invoive considerable cost particularly in existing roofs, which have to be brought up to minimum standards by added insulation and other factors, because of the need for scaffolding, the alteration of-construction details, the cost of the devices themseives and labour costs. Tile and ridge vents and other special vents used to answer some of the problems are protruberances on the roof not desired on aesthetic grounds.

The present invention provides a roof space ventilator for a tiled or slated roof, which is felted beneath the tiles or slates, comprising a member adapted to fit between the lapped parts of the felt in order to provide an air channel communicating between the roof space beneath the flet and the upper air space between the felt and the tiles or slates.

A number of such ventilators would be used in a roof and the maximum number is determined by the felt width and lap adopted. Their use permits ventiiation to the whole roof or to the small isolated areas found in all but the simplest of roof configurations. They operate by allowing the entry and exit of air from side to side of a roof by wind action and also by the stack effect from the lower to the higher on the same side of the roof, which is important in lean-to, monopitch and any trimmed roof spaces. The ventilator can be applied from inside or outside during construction of the roofing and from the inside after construction i.e. to both new and existing roofs, without the need of scaffolding, equipment or the removal of tiles or other parts of the roof construction. It can be fitted upside down from above the felt when reroofing, renovating and repairing.It can be fitted by unskilled labour and therefore suits both the contract and DIY fields.

Specific embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which Figs. 1 to 3 show one embodiment of the invention and Figs. 4 to 6, Figs. 7 to 9, Figs. 10 to 12, Figs. 13 to 15, Figs. 16 and 17 and Figs. 18 and 19 respectively show differing modifications of the invention.

Example 1.

Refering to Figs. 1 to 3, there is shown the ventilator in Fig. 1 in three dimensions, Fig. 2 in longitudinal section between layers of felt shown dotted and Fig. 3 in elevation of the open end with insect mesh beyond and between layers of felt shown dotted.

The ventilator comprises a shallow segmental shaped tube 1, flat topped and curved bottom, with mesh insect guard 2 closing the tube at one end and the other 3 left open.

Fixing lugs 4 at the open end are positioned at the ends of the curved bottom to hook over the felt 5 to hold the ventilator in position and as shown in Fig. 3 hold the felt close to the ventilator to prevent gaping at the sides.

Example 2.

Refering to Figs. 4 to 6 there is shown the ventilator in Fig. 4 in three dimensions, Fig. 5 in longitudinal section between layers of felt shown dotted and Fig. 6 in elevation of the open end with insect guard beyond and between layers of felt shown dotted.

The ventilator comprises a corrugated form 1 with boundaries of a prism of segmental cross section, flat topped and curved bottom with insect guard 2 closing one end the other end 3 left open. Fixing lugs 4 at the open end are positioned at the ends of the curved bottom to hook over the felt 5 to hold the ventilator in position and as shown in Fig. 6 hold the felt close to the ventilator to prevent gaping at the sides.

Example 3.

Refering to Figs. 7 to 9 there is shown the ventilator in Fig. 7 in three dimensions, Fig. 8 in longitudinal section between layers of felt shown dotted and Fig. 9 in end elevation and between layers of felt shown dotted.

The ventilator comprises a corrugated form 1 with boundaries of a prism of segmental cross section, flat topped and curved bottom, wherein the corrugations have spaces between of a size to be a guard against insects. Fixing lugs 4 at one end are positioned at the ends of the bottom curve to hook over the felt 5 to hold the ventilator in position and, as shown in Fig. 9, hold the felt close to the ventilator to prevent gaping at the sides.

Example 4.

A ventilator as described in Examples 1, 2 and 3 wherein the cross section is triangular, the bottom having a boundary with two sides as shown in Figs. 10 to 12.

Example 5.

A ventilator as described in Examples 1, 2 and 3 wherein the cross section is polygonal, the bottom having a boundary with more than two sides as shown in Figs. 13 to 15.

Example 6.

A ventilator as described in Examples 1, 2, 3, 4 and 5 wherein the end opposite the lugs 4 is splayed 6 to facilitate the entry of the body between the felt layers 5, as shown in Fig. 16.

Example 7.

A ventilator as described in Examples 2, 3, 4, 5 and 6 wherein the lugs 4 are shaped 7 so that as they ride over the felt edge they clamp the felt to the body by wedge action as shown in Fig. 17.

Example 8.

A ventilator as described in- Examples 2, 3, 4, 5 and 6 wherein the lugs 4 form extensions of one of the planes of the body 1 and which can be bent to fit over the felt 5 as shown in Figs. 18 and 19.

Claims

1. A roof space ventilator for a tiled or slated roof which is felted beneath the tiles or slates, comprising a member adapted to fit between the lapped parts of the felt in order to provide an air channel communicating between the roof space beneath the felt and the upper air space between the felt and the tiles or slates.

2. A ventilator as claimed in claim 1, bearing means which attach to the edge of the felt to hold the air channel member in position.

3. A ventilator as claimed in claim 1 and claim 2 bearing means which hold the felt close to the ventilator.

4. A ventilator as claimed in claim 1 or claim 2 or claim 3 wherein the- air channel member is a flat segmental cross section shape, having a flat surface on one side and a shallowly curved convex surface on the other side.

5. A ventilator as claimed in claim 1 or claim 2 or claim 3 or claim 4 wherein the air channel member has an insect guard at least at one end.

6. A roof space ventilator substantially as described with reference to Figs. 1 to 3 or Figs. 4 to 6 or Figs. 7 to 9 or Figs. 10 to 12 or Figs. 13 to 15 qr Fig. 16 or Fig. 17 or to Figs. 18 and 19 of the accompanying drawings.