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VCL, regs vs improved?


Jenni

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Hello. 

 

I'm converting a barn, single storey, warm loft / vaulted ceilings. 

 

I'm not aiming for a super-efficient house, nothing near passiv. But I do want it to be suitable for MVHR. 

 

    My regs document states -

"Between each rafter 30mm cavity with 70mm Celotex FR 5000 insulation, 60mm FR 5000 under rafter with joints taped to form VCL and air leakage barrier. 25mm barrier using 25mm x47mm battens and 12.5mm Gyproc wallboard. Design to achieve 0.16w/m2k." 

 

My question is - does taping the joins of the insulation make a good enough / reliable VCL? 

 

If not, I'd welcome some recommendations for what to use instead please. 

 

 

 

 

 

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  • 4 weeks later...

Yes VCL on the warm side. You could certainly tape the insulation boards with foil tape, I did the same on my latest vaulted ceiling, however you have to look carefully over the whole surface of the boards and ensure any nicks or imperfections are taped over too, if your boards are a bit beaten up, may be worth just using expanding foam in any gaps and then an AVCL over the top held in place by your battens.

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