Morning All

 

So I have two options for a continuous vapour control layer to meet building regs - according to the architect anyway

either install a membrane all over and use standard plasterboard

 

or his preferred method of duplex / vapour check plasterboard.

 

 

Difference in cost to me is £700 between the two, plus my time to install the membrane (It's a very large area and high ceilings)

Are there pros and cons to either?

 

 

 A separate question,

My local builders mechants only supplies tapered edge plasterboard, is this an issue when skimming? should I find square edge somewhere else?

Duplex all day long

We are hardly ever asked for vapour barriers anymore 

Tapered edge are preferred 

Im not sure why square edge boards are made anymore