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extension cavity tray
- Thread starter RME
- Start date
At school, we were taught English from books such as this (note the price).
Perhaps today's generations should do likewise.
Perhaps today's generations should do likewise.
Bearing in mind the brickwork is in good order and there are 2 windows above, I wouldn't fit trays, even on my own house. I believe it's too disruptive, and serves no benefit.
I was going to make the point about water coming from weepholes myself.
Never seen it yet!
On a exposed gable end with poor brickwork above. Fitting them would be worthwhile.
The BC guys do seem to like them though, although it's not their money they're spending....
I was going to make the point about water coming from weepholes myself.
Never seen it yet!
On a exposed gable end with poor brickwork above. Fitting them would be worthwhile.
The BC guys do seem to like them though, although it's not their money they're spending....
We have had a couple of similar jobs, one of which was a gable wall and bco were happy to apply 2no coats of Thompson water seal to the brickwork, instead of fitting trays, the brickwork and pointing was in good condition.
The majority of rain usually penetrates through the perps. This tends to be the weakest point as the joints are not always properly filled, especially when tip jointed on the face only.
It also depends on the exposure of the wall and what part of the country you live in. Coastal areas or places like the South West are more likely to suffer, where there is a lot of heavy, driving horizontal rainfall.
It also depends on the exposure of the wall and what part of the country you live in. Coastal areas or places like the South West are more likely to suffer, where there is a lot of heavy, driving horizontal rainfall.
Rather than be robotic with 'should' and 'must', just do a quick risk assessment in your head of the likelihood of water getting down the cavity, in such quantities so as to cause a problem.
A surface applied repellent will do in most cases, but often no additional work will be fine. Only in directly exposed locations, with high risk, should the trouble of retrospectively inserting trays be considered
A surface applied repellent will do in most cases, but often no additional work will be fine. Only in directly exposed locations, with high risk, should the trouble of retrospectively inserting trays be considered
Its a wonder we bother fitting cavity trays at all in any cavity wall isn't it! 
It depends if you're stuck in your ways or not! 
Dri-therm insulation IS a cavity moisture barrier.
I may be stuck in my ways, but I also know that taking a row of bricks out of a wall and then fitting them back again with only 30% of the original mortar is generally poor practice.
they are still better than the 60`s builds though 
Makes sense Tony.
Some building inspectors these days are human- and would go with you on this one .
Waterseal on brickwork between new roof and upper window would help.
If it worries you though- It really is no big deal to fit a stepped tray .
Half a day at best and a full day at worst .
I would charge £200 plus tray costs--job done- peace of mind .
Half a day at best and a full day at worst .
I would charge £200 plus tray costs--job done- peace of mind .
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