Timber frame on existing rendered cavity extension

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osmol

osmol

New Member
We're currently building a timber frame extension on top of our existing extension which is rendered. I know I can cement board then render over the timber frame but what's the best way to deal with the section where the timber frame meets the old extension but keep a cavity open for drainage if any water was to get behind?
 
themucky1 said:
Pictures please
Click to expand...
PXL_20230326_104406681~2.jpg


Best I can show as the other side is covered in tarp.
 
You need a vented channel at the bottom of the carrier board and make sure that the render manufacturer you use says their materials are ok to go onto the board you’re using
 
themucky1 said:
You need a vented channel at the bottom of the carrier board and make sure that the render manufacturer you use says their materials are ok to go onto the board you’re using
Click to expand...

Any idea how we can achieve this whilst trying to match up the renders of the new and old extension? We are using EWI base and top coats which they state are good to use on all cement boards. I did just realise I forgot to buy some primer though
 
osmol said:
Any idea how we can achieve this whilst trying to match up the renders of the new and old extension? We are using EWI base and top coats which they state are good to use on all cement boards. I did just realise I forgot to buy some primer though
Click to expand...
Is this a self build and you're going to render it yourself?
 
osmol said:
Any idea how we can achieve this whilst trying to match up the renders of the new and old extension? We are using EWI base and top coats which they state are good to use on all cement boards. I did just realise I forgot to buy some primer though
Click to expand...
What manufacturer is the board
 
essexandy said:
Is this a self build and you're going to render it yourself?
Click to expand...

No it'll be contracted.

themucky1 said:
What manufacturer is the board
Click to expand...

I'm actually unsure, it was picked up by my builder. EWI just states it can be used on cement boards. We spoke with them on the phone and they seemed okay with it all but we didn't discuss a way to vent the bottom where it joins the old extension.

Just need to work that part out...
 
osmol said:
No it'll be contracted.



I'm actually unsure, it was picked up by my builder. EWI just states it can be used on cement boards. We spoke with them on the phone and they seemed okay with it all but we didn't discuss a way to vent the bottom where it joins the old extension.

Just need to work that part out...
Click to expand...
It also needs venting around the soffit too!
Around window frames need ventilating and a deflection head needs installing too. I’m sure you’ll be fine, sounds like you got it all under control
 
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