retrofit cavity trays

[Adrian80]

Hi all,

I am on to the roof part of my extension...

I have an abutting roof requiring a secret gutter.. however i am not sure if i should retrofit some cavity trays as well.

http://www.cavitytrays.co.uk/pdf/67-Type-X-Remedial.pdf

seems like a hell of a lot of work, and i would have thought if water penetration was a real problem, i would get damp above my windows..

What do most people do, and what seems to fly with the boys from the BC..

Any thoughts greatly appreciated.

A

 

[freddiemercurystwin]

I've never done an extension where BC didn't insist on them. Rightly so too IMO I gotta say.

Depending on the age of the property you could well have trays above your windows which will be deflecting any penetrating rainfall away from the inner skin.

 

[Adrian80]

Thanks freddy, you might well be right..

Chopping out the bricks seems like a hell of a job, whats the best solution.

Is it these preformed trays? they seem quite expensive, and i think i would need quite a few to.

http://www.dpcproductsdirect.com/product-detail.php?pid=145

do people do this on conservatories/porches and alike, as potentially less of an issue under the soffits? or is it just gables.

I have a porch going in at the same time. which is going on to a rendered wall, which i guess is a lot more water proof than brick work.

Thanks
A

 

[noseall]

Retro-fitting cav trays is an absolute mare!

Coastal or exposed mebbe, otherwise i'd vote no.

 

[Adrian80]

Well two alternative views.

I supposed the only definitive way to find out is ask the BCO.

However i dont want to make unnecessary work for myself, but i also dont want to have a damp problem...

decisions decisions...

 

[datarebal]

personally, I think they should be fitted, there are times when you might get away with out.. a risk you take i guess. A good BCO would expect it

 

[Adrian80]

Looking at all the posts on the site, it seems that lots of people have damp issues if the dont fit them.

So i better get a decent mortar rake to get the bricks out...


Any advice on tools to make it easier,

this thing looks truly fragile....
http://www.toolstation.com/shop/p36489

and i already have one of these..
http://www.toolstation.com/shop/p39281

Any other genius gadgets to make life easier???

 

[peterperfection]

Looking at all the posts on the site, it seems that lots of people have damp issues if the dont fit them.

So i better get a decent mortar rake to get the bricks out...


Any advice on tools to make it easier,

this thing looks truly fragile....
http://www.toolstation.com/shop/p36489

and i already have one of these..
http://www.toolstation.com/shop/p39281

KANGO- ks 26-- that's what i use- if you want to keep the mess down.
Always a few for sale on ebay. Buy one- use it and then put it back on ebay.
But- in all honesty- after you get he first few bricks out- it is pretty easy to get the others out. Grinder- then tap tap tap away with the back of handle of a lump hammer to loosen them.
However- I really have seen some real 'rough' cavity tray jobs.

Find someone who is a decent builder and knows what he is doing - ok- it's a time consuming job- but- what price do you put on peace of mind ?.

I have done quite a few of them. It is one of those jobs you can not rush.

Any other genius gadgets to make life easier???

 

[Adrian80]

Well the BCO, insisted on the cavity trays or render. However to comply with planning i need to use the cavity tray..

16 trays took me all day and was a pig.

I am not quite sure of the wisdom of cutting up a nice gable and fitting them in, however the job is now done.

I ended up using sds heller brick extractor, this worked really well and didn't take to long to get the bricks out.

I pointed them back in the with a pointing gun.

It seems a shame a bit of thompsons water seal wouldn't be allowed.

anyhow thats life..

A

 

[freddiemercurystwin]

Yes yes, blahdy blah.