cwr

Air tightness membrane for hollow core ends

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Hi folks

What is the recommended air tightness membrane for sealing the ends of hollow core slabs?

 

Does it need to be a specialist membrane or would a 1200 gauge PE sheet or wide dpc do?

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Without knowing your airtightness strategy, I would think membrane and tape would be tricky to detail on hollowcore slabs.

 

Take a look at FM330 foam and blowerproof liquid.

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Tony tray, or fill ends with foam 

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Thanks for the suggestions.

 

I have read a little about Tony Trays. I like the concept and it works with out air tightness plan of wet plastering the inner block skin. The hollow cores are for the first floor by the way, so wet plastering above and below.

 

Just wondering about exactly what to use for the membrane.

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I used an airtight breather membrane,  I see poly as too slippy, dpc as bit too stiff 

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12 hours ago, cwr said:

Hi folks

What is the recommended air tightness membrane for sealing the ends of hollow core slabs?

 

Does it need to be a specialist membrane or would a 1200 gauge PE sheet or wide dpc do?

 

43 minutes ago, tonyshouse said:

I used an airtight breather membrane,  I see poly as too slippy, dpc as bit too stiff 

Hi cwr.

 

Run this by your SE. The thing is that the SE may be relying on the frictional / bond resistance between the floor slab and the wall to provide lateral stability to the building. If you introduce a slippy bit of plastic between the slab and the wall as tonyshouse says you could be making a rod for your back.

 

Foaming up the ends of the slab looks a bit simpler as suggested.

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