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Wooden shed insulation or wood preservative?

I've had a garden office made; well, glorified shed. The insulation they've used is celotex but not fitted very well. The wall felt damp when I removed the boards and insulation to check. There is no wood preservative or wood treatment on the inside whatsoever; do I need a vapour barrier and what is the best wood preservative to use? Thank you.

Answered by TrustATrader

To start with we would recommend using Cuprinol or other clear paint/spray on preservatives to treat the wood (which can be found at you local Screwfix or Toolstation) and make sure to wear face protection! especially as you are in a confined space.

When the added preservative is dry, refit the insulation and fill in any gaps with expandable foam to reduce moisture entering. After you have refit and sealed the gaps (standard tape should be fine), add a damp proof membrane (vapor barrier) with taped seams, then reboard to finish.

Thank you.

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