eandg Posted September 25, 2019 Share Posted September 25, 2019 How big should they be? I've read in a few places 37/38mm and in others 50mm. Link to comment Share on other sites More sharing options...
Thedreamer Posted September 25, 2019 Share Posted September 25, 2019 11 minutes ago, eandg said: How big should they be? I've read in a few places 37/38mm and in others 50mm. Our service voids were 45mm x 45mm, I did consider going smaller to save on space or prehaps add 10mm onto the insulation, but in the end we decide to keep it simple and to what the electrician and joiner suggested. 1 Link to comment Share on other sites More sharing options...
ProDave Posted September 26, 2019 Share Posted September 26, 2019 25mm battens are plenty for most things. That's what most of our house has. A 25mm batten plus 12.5mm plasterboard is perfect depth for a 35mm electrical back box, and enough room to get 15mm copper pipes (kitchen tap hot and cold drop) I used 45mm battens only in the utility room where I wanted more room for 22mm copper piping. Link to comment Share on other sites More sharing options...
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