If I fit some PIR insulation to my log cabin roof (internally - so ceiling) what's going to be the best process I'd like to get a decent thickness but also not lose too much height.
You'd need to include sufficient space for ventilation too, as you;'re making a cold roof - IRIC 50mm is the recommended minimum. Otherwise, you risk condensation & damp leading to rot etc...
Battens & PIR would work, or you could use an insulation blanket (lower W/mK, but much thinner)
If I fit some PIR insulation to my log cabin roof (internally - so ceiling) what's going to be the best process I'd like to get a decent thickness but also not lose too much height.
Like this but only 4 sections