Digmixfill Posted June 25, 2019 Share Posted June 25, 2019 Is there a rule of thumb percentage add on for tongue and groove pir cavity board ordering? I've had a quick look around for wastage figures for t&g pir in cavity installations but haven't turned up anything yet. Link to comment Share on other sites More sharing options...
Declan52 Posted June 25, 2019 Share Posted June 25, 2019 You don't waste that much as you use the bit left over from a cut to start another row. Like you do with wooden flooring so the joints are all staggered. It will be small triangle bits that you will be left with when you come to the peaks. Link to comment Share on other sites More sharing options...
Digmixfill Posted June 26, 2019 Author Share Posted June 26, 2019 Perfik! Link to comment Share on other sites More sharing options...
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