Choose finishes with the wall

Start with compatibility

Ask the system designer which internal and external finishes are compatible with the intended moisture behaviour and exposure. A finish is part of the assembly, not a decoration-only decision.

What research shows

University of Bath experiments found moisture-buffering performance changed with wall linings and paints. Tested synthetic trade paint reduced buffering in those assemblies; this does not establish the performance of every paint or finished wall.

Prepare a sample specification

Record the substrate, preparation, primer if required, finish coats and manufacturer guidance. Ask for a sample panel to review colour and texture before committing.

Keep the water strategy intact

The choice of a vapour-open finish does not remove the need for sound roof, base and opening details or a ventilation strategy.

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