Cavity/Non cavity walls

[Freerider]

Alright guys, this probably sounds stupid to some of you but here goes..

On internal rendering..

When its a single skin wall and theres no cavity it obviously needs waterproof rendering right..

So when there is a cavity you dont have to render but can dab or float, right...

Now surely if the wall is a cavity wall, when you plaster the reveals you are bridging over onto the first skin, therefore creating a means of damp getting through to the plaster/dabbed walls?

Let me know if you dont understand what Im getting at, simple if I could show you what I mean! just something that came into my head as I had two jobs recently patching up around a backdoor where the render was blown/damp, one was single skin and the other had a cavity.

 

[Gibbo]

the one with the cavity shoud have a cavity closer on it so you dont bridge it

 

[micky77]

yeah should have a cavity closer so theres no bridge between the 2 skins i been on a few jobs where damp has bridged coz no cavity closer people have dabbed over the gap probably down to builder running out of closer and cant be bothered to buy anymore takes a while to penetrate if external pointing is ok and frame masticed

 

[Freerider]

cheers fellas!