- Joined
- 14 Feb 2016
- Messages
- 23
- Reaction score
- 0
- Country
Hi all
currently having my vaulted ceiling built.
Roof construction is 150 x 50 rafters .
Breathable membrane then rafters will have 120 mm foil faced pir and foil faced 60 mm pir underneath .(maybe 50 mm if building regs flex)
Then it will be battoned and plasterboarded creating a void for cables , but mainly for downlights to be installed without cutting into PIR.
we have to achieve 0.13 u rating which above just about does .
Should this void be kept free of insulation , or should I stick some more pir in between the battons (just not around the downlights)
The additional pir will be if anything left in the bank
thanks all for any thoughts/guidance
currently having my vaulted ceiling built.
Roof construction is 150 x 50 rafters .
Breathable membrane then rafters will have 120 mm foil faced pir and foil faced 60 mm pir underneath .(maybe 50 mm if building regs flex)
Then it will be battoned and plasterboarded creating a void for cables , but mainly for downlights to be installed without cutting into PIR.
we have to achieve 0.13 u rating which above just about does .
Should this void be kept free of insulation , or should I stick some more pir in between the battons (just not around the downlights)
The additional pir will be if anything left in the bank
thanks all for any thoughts/guidance