I'm relatively new to the site and a novice DIY'er.
I seem to read a lot about condensation due to lack of ventilation between the insulation and roof. 100mm insulation between the rafters with 50mm insulation covering the rafters and 50mm air gap seems the norm.
Would 75mm between, 75mm covering and 50mm air gap insulate the room better?
And:
50mm between, 100mm covering and 75mm air gap prevent condensation and ventilate better?
I seem to read a lot about condensation due to lack of ventilation between the insulation and roof. 100mm insulation between the rafters with 50mm insulation covering the rafters and 50mm air gap seems the norm.
Would 75mm between, 75mm covering and 50mm air gap insulate the room better?
And:
50mm between, 100mm covering and 75mm air gap prevent condensation and ventilate better?