Cavity closers

[freddiemercurystwin]

But it does make mechanically fixing things to the inside of the opening a tad tricky...

Enlighten me.

 

[ban-all-sheds]

How do you fix into this:

?

 

[freddiemercurystwin]

Why do you need to fix into it?

 

[indus]

So is it always wrong to close a cavity with brick?

Thanks

 

[freddiemercurystwin]

Its OK if its done neatly and BC are OK with it. But it seldom is. BC haven't accepted that method down this way for a about 15 years. NHBC haven't either. Damcors went out with the ARK!

 

[indus]

Its OK if its done neatly and BC are OK with it. But it seldom is. BC haven't accepted that method down this way for a about 15 years. NHBC haven't either. Damcors went out with the ARK!

Thanks Fred.

What is the potential issue with brick closers? ie why don't bc tend to like them?

 

[ban-all-sheds]

Why do you need to fix into it?

You never know.

 

[freddiemercurystwin]

Its OK if its done neatly and BC are OK with it. But it seldom is. BC haven't accepted that method down this way for a about 15 years. NHBC haven't either. Damcors went out with the ARK!

What is the potential issue with brick closers? ie why don't bc tend to like them?

The potential is for poor workmanship, you have to cut slithers of block to build up the closer, that's fine if your bricky is meticulous or you're a keen DIYer but all too often brick's will just throw up a wall rather than take proper care. Hence BC in this neck of the woods (were often quite exposed to coastal winds etc) insist on proper closers, generally speaking. NHBC have gone the same route.

And damcors can just fall out or the flap can easily be left turned back on itself when it should protrude outwards when the fitters fit the windows.

 

[indus]

Thanks Freddy. Is the closure in the pic rubbish then? If it is could you please tell me what problems it could cause? I'll need to know what the issue is to get the builder to put it right otherwise he'll insist he has done it like that for twenty years without any problems

 

[noseall]

Erm...where's the dpc?

 

[indus]

Erm...where's the dpc?

Thanks Noseall.

Are you talking about the normal dpc at the ground/threshold level? Or some kind of dpc related to the cavity?

Thanks again

 

[freddiemercurystwin]

What you have there indus, is a monumental cold bridge! So not only can damp get to the inside masonry but the inside masonry will be very cold too, condensation is abound I'm afraid. Terrible!

 

[indus]

Thanks Freddy.

Could you kindly tell me how it should be appropriately rectified?

 

[freddiemercurystwin]

 

[indus]

Thanks Freddy.

So the basic principle is that the outer wall must not make contact with the inner wall unless it is with an insulating material?

Therefore I understand how that could cause a cold inner wall and therefore condensation. You mentioned that moisture could also get through. Does the cavity closerin the pic have a way of preventing this moisture from getting through.

Really grateful for this timely advice, my bi folds arrive soon!