GB2130616A

GB2130616A - A damp proof cap for protecting floor joists

Info

Publication number: GB2130616A
Application number: GB08233648A
Authority: GB
Inventors: Albert Symcox
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-11-25
Filing date: 1982-11-25
Publication date: 1984-06-06

Abstract

A cap (4) for protecting the wall supported end of a floor joist (3) from damp brickwork comprises a sleeve, closed at one end and adapted to fit closely around the end of the joist. The sleeve is of sufficient length to extend, at least the full length of the end of the joist support in the wall, and comprises damp-proof material e.g. felt. The sleeve preferably extends along the joist beyond the sides of the cavity (2). <IMAGE>

Description

SPECIFICATION A damp proof cap for protecting floor joists The present invention relates to a cap for protecting the wall supported end of a floorjoistfrom damp brickwork, and for ensuring that the joist is mounted in the wall to the correct depth.

Wherefloorjoists are subjected to prolonged damp, they will eventually, begin to rot, which necessitates their replacement at great expense and inconveni ence. Natu rally, floor joists tend to be most prone to damp attheirwall supported ends as it is through the brickworkthat damp rises to reach them.

In order to protect floorjoists from the effects of damp it is known to treat them with liquid damp proofing chemicals, but this chemical treatment is ineffective if applied to joists which are already damp, and furthermore may take upto a month to cure and become fully effective.

It is an object ofthe present invention to provide a cap wherebythe wall supported end of a floor joist may be simply and effectively protected from damp, and which, fu rthermore, provides a measureofthe depth to which the end ofthejoist is mounted in the wall.

According to the present invention there is provided a cap for protecting the wall supported end of a floor joist from damp brickwork,the cap comprising a sleeve, closed at one end and adapted to fit closely around the end of the joist, the sleeve being of sufficient length to extend, at least the full length of the end ofthe joist support in thewall, and being comprised of damp-proof material.

Preferably the sleeve ofthe cap is of sufficient length to extend overthejoist beyond the edge ofthe wall supporting the same to provide a measure ofthe depth to which the end ofthejoist is supported in the wall.

Preferablythe cap is comprised of a blank of damp proof material which may be erected into a sleeve, one end of which is closed, adapted to fit closely around the end of a joist.

Preferably the damp proof material is damp proof felt.

An embodiment ofthe present invention will now be described, by way of example, with reference to the accompanying drawings, in which Fig. 1 shows an exploded view ofthe wall mounted end of a floor joist provided with a damp proof cap according to the present invention; and Figs. 2 to 4 show a damp proof cap embodying the present invention in various stages of erection from a damp proof felt blank.

Referring to Fig. 1 ofthe accompanying drawings there is shown a brickwall 1 of a building having therein a number of cavities 2, in each or ofwhich the end of a floorjoist 3 is supported.

In order to protectthe brick wall 1 and the joists 3 from the effects of damp rising in the wall 1 a conventional damp proof course is normally provided in the wall belowthe level of the cavities 2. However, because damp proof courses can fail to operate effectively, and furthermore, to provide additional protection against damp for the joists 3, each joist 3 is provided with a cap 4 of damp proof material, which is fitted overthe wall mounted end of the joist 3 before it is mounted in its respective cavity 2. Each cap 4 comprises a sleeve, closed at one end, of for example, damp proof felt, which fits securely around the end of a joist 3.The length ofthe sleeve is such that when the end ofthejoist 3 is mounted in its respective cavity 2, in the wall 1, it extends around joist3 beyond the sides ofthe cavity 2. This ensures that no exposed part of the joist 3 is in contact with the wall 1 where it can be subject to damp, and in addition, provides a measure of the depth into the wall the end ofthe joist is inserted, as the amount of sleeve showing beyond the wall 1 can be measured. In fact, by always ensuring that the length of sleeve of each cap 4 is identical, it is possible, byensuring thatthe sleeve always extends a predetermined distance beyond the wall 1, to position the jOists 3 within their respective cavities 2 to a predetermined depth.

Referring nowto Figs. 2to 4 of the accompanying drawings there is shown a damp prooffelt blank 5 in various stages of erection into a cap embodying the present invention. The method of erection ofthe blank is self evident from the drawings and therefore it is considered unnecessaryto go into detail here. However, by way of explanation, panels 6, 7, 8, and 9 form the sleeve 10 ofthe cap, whilst panel 11 closes off one end ofthe sleeve 10. Tabs 12,13 and 14 ensure that the erected cap is rigid and tab 15, which may be secured in place, holds the erected cap together.

It will be appreciated that the cap according to the present invention may be comprised of any long lasting damp proof material.

It will be realised that the ends of joists fitted with the cap according to the present invention are also fully protected against moisture and dampness circulating in the cavity space of cavity walls, In this instance, condensation may occur on the inside walls of the cavity space and run down onto the joist ends, but these are fully protected by the cap according to the present invention.

The cap according to the present invention also provides protection from damp forjoists in cavity walls where debris has fallen down into the cavity space, above the level ofthe damp course and bridged the inner and outer leafs ofthe wall.

CLAIMS: (Filed on 23.11.83) 1. A captor protecting thewall supported end of a floorjoistfromdamp brickwork,thecapcomprisinga sleeve, closed at one end and adapted to fit closely around the end of the joist, the sleeve being of sufficient length to extend, at least the full length of the end ofthejoist support in the wall, and being comprised of damp-proof material.

2. A cap according to claim 1, wherein the sleeve of the cap is of sufficient length to extend overthe joist beyond the edge of the wall supporting the same to provide a measure of the depth to which the end ofthe

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A damp proof cap for protecting floor joists The present invention relates to a cap for protecting the wall supported end of a floorjoistfrom damp brickwork, and for ensuring that the joist is mounted in the wall to the correct depth. Wherefloorjoists are subjected to prolonged damp, they will eventually, begin to rot, which necessitates their replacement at great expense and inconveni ence. Natu rally, floor joists tend to be most prone to damp attheirwall supported ends as it is through the brickworkthat damp rises to reach them. In order to protect floorjoists from the effects of damp it is known to treat them with liquid damp proofing chemicals, but this chemical treatment is ineffective if applied to joists which are already damp, and furthermore may take upto a month to cure and become fully effective. It is an object ofthe present invention to provide a cap wherebythe wall supported end of a floor joist may be simply and effectively protected from damp, and which, fu rthermore, provides a measureofthe depth to which the end ofthejoist is mounted in the wall. According to the present invention there is provided a cap for protecting the wall supported end of a floor joist from damp brickwork,the cap comprising a sleeve, closed at one end and adapted to fit closely around the end of the joist, the sleeve being of sufficient length to extend, at least the full length of the end ofthe joist support in thewall, and being comprised of damp-proof material. Preferably the sleeve ofthe cap is of sufficient length to extend overthejoist beyond the edge ofthe wall supporting the same to provide a measure ofthe depth to which the end ofthejoist is supported in the wall. Preferablythe cap is comprised of a blank of damp proof material which may be erected into a sleeve, one end of which is closed, adapted to fit closely around the end of a joist. Preferably the damp proof material is damp proof felt. An embodiment ofthe present invention will now be described, by way of example, with reference to the accompanying drawings, in which Fig. 1 shows an exploded view ofthe wall mounted end of a floor joist provided with a damp proof cap according to the present invention; and Figs. 2 to 4 show a damp proof cap embodying the present invention in various stages of erection from a damp proof felt blank. Referring to Fig. 1 ofthe accompanying drawings there is shown a brickwall 1 of a building having therein a number of cavities 2, in each or ofwhich the end of a floorjoist 3 is supported. In order to protectthe brick wall 1 and the joists 3 from the effects of damp rising in the wall 1 a conventional damp proof course is normally provided in the wall belowthe level of the cavities 2. However, because damp proof courses can fail to operate effectively, and furthermore, to provide additional protection against damp for the joists 3, each joist 3 is provided with a cap 4 of damp proof material, which is fitted overthe wall mounted end of the joist 3 before it is mounted in its respective cavity 2. Each cap 4 comprises a sleeve, closed at one end, of for example, damp proof felt, which fits securely around the end of a joist 3.The length ofthe sleeve is such that when the end ofthejoist 3 is mounted in its respective cavity 2, in the wall 1, it extends around joist3 beyond the sides ofthe cavity 2. This ensures that no exposed part of the joist 3 is in contact with the wall 1 where it can be subject to damp, and in addition, provides a measure of the depth into the wall the end ofthe joist is inserted, as the amount of sleeve showing beyond the wall 1 can be measured. In fact, by always ensuring that the length of sleeve of each cap 4 is identical, it is possible, byensuring thatthe sleeve always extends a predetermined distance beyond the wall 1, to position the jOists 3 within their respective cavities 2 to a predetermined depth. Referring nowto Figs. 2to 4 of the accompanying drawings there is shown a damp prooffelt blank 5 in various stages of erection into a cap embodying the present invention. The method of erection ofthe blank is self evident from the drawings and therefore it is considered unnecessaryto go into detail here. However, by way of explanation, panels 6, 7, 8, and 9 form the sleeve 10 ofthe cap, whilst panel 11 closes off one end ofthe sleeve 10. Tabs 12,13 and 14 ensure that the erected cap is rigid and tab 15, which may be secured in place, holds the erected cap together. It will be appreciated that the cap according to the present invention may be comprised of any long lasting damp proof material. It will be realised that the ends of joists fitted with the cap according to the present invention are also fully protected against moisture and dampness circulating in the cavity space of cavity walls, In this instance, condensation may occur on the inside walls of the cavity space and run down onto the joist ends, but these are fully protected by the cap according to the present invention. The cap according to the present invention also provides protection from damp forjoists in cavity walls where debris has fallen down into the cavity space, above the level ofthe damp course and bridged the inner and outer leafs ofthe wall. CLAIMS: (Filed on 23.11.83)

1. A captor protecting thewall supported end of a floorjoistfromdamp brickwork,thecapcomprisinga sleeve, closed at one end and adapted to fit closely around the end of the joist, the sleeve being of sufficient length to extend, at least the full length of the end ofthejoist support in the wall, and being comprised of damp-proof material.

2. A cap according to claim 1, wherein the sleeve of the cap is of sufficient length to extend overthe joist beyond the edge of the wall supporting the same to provide a measure of the depth to which the end ofthe joist is supported in the wall.

3. A cap according to claim 1 or 2, wherein the cap is comprised of blank of damp proof material which may be erected into a sleeve, one end ofwhich is closed, adapted to fit closely around the end of a joist.

4. A cap according to any preceding claim wherein the damp proof material is water proof felt.

5. A cap for protecting the wall supported end of a floorjoistfrom damp brickwork substantially as hereinbefore described.