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PostPosted: Sun Feb 05, 2017 1:12 pm 
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Hello all. Getting ready to order the plasterboard for our selfbuild external walls. The walls are 145 timber frame with the frame filled with frametherm 32 (mineral wool) and then Recticel 30mm foil faced insulation over the studs and fully taped with 45mm x 45mm studs to form the unventilated service void. The plans show 15mm duplex plasterboard as the VCL. Will the taped insulation not be the VCL meaning that I can use plain plasterboard and save around £400, or does the duplex stop any moist air getting to the service void. Many thanks.


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PostPosted: Sun Feb 05, 2017 1:46 pm 
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AFAIK no tape on the market has been tested for its' adhesive ability over, say, a 50 year life span so relying on tape alone is possibly (probably?) going to be a bit iffy. Certainly on our current project the dry liners have gone the belt and braces route to ensure that they meet the standards

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PostPosted: Sun Feb 05, 2017 2:18 pm 
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Cheers for that. The taped joints are under the service void timbers....so the tape is well compacted to the joints. Surely that's a better VCL join than what you'd get with the duplex plasterboard as its just butted together. Using duplex will definately be the belt and braces as you say.....I'd effectively have 2 VCL's.


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PostPosted: Sun Feb 05, 2017 4:58 pm 
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The taped joints are fine on the foil,no need for duplex boards.
12.5mm boards are fine as well,no need for 15mm Just use green(moisture resistant) boards in the bathroom external walls,
I'm assuming this is a timber kit?
You wouldn't have 2 vapour control layers either as the switches and socket cut outs would break them anyway,hence framing out for a service void.


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PostPosted: Mon Feb 06, 2017 7:25 pm 
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Hi Steve. Many thanks for the reply. Thats what I thought and I spoke to the insulation company today who said the same......don't know why its specified on drawings. The 15mm is for strength.....against the kids. The internals are all 12.5 as the walls are at 400 centres.....the externals are 600.


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