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Wanderers Ways. Neil Thompson 1961-2021

Cavity Wall Insulation


gonzo

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We are thinking of rendering the whole house in K rend which I believe is silicon based and water repellent (to an extent)

 

Would this then reduce the risk of cavity wall insulation getting damp?

K rend is good but you need a good dry spell when it's applied, any rain/moisture on it will RUIN it. Also the colour pigments fade quite a bit over time.
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I wouldn’t expect it to last forever, i’m assuming it’s a simple paint job every few years rather than a full re render?

Should be OK to paint over with a normal masonry paint, but because of the silicone content of the k rend I would seek advice.
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Is it compulsory for renderers to coat windows and frames with bastard render every time they apply it? The fuckers get more on the window than on the wall.

 

Always wondered why new windows can't go in after the render has taken place??

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I'm not an expert on this as it's not really structural but..

 

The cavity is the last line of defence if water gets in. It's bloody difficult to get buildings 100% watertight, the cavity will redirect water via the tray at the bottom.

 

Now if you fill the cavity with insulation, water that would otherwise leave the building has a pathway inside.

 

So good or bad idea, it depends.

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