islanderre
Registered User
- Messages
- 26
Hello all,
I'm currently building an ICF Dormer style house. All walls are complete and roof has just been felted.
My original plan to achieve good air tightness and insulation levels (as going to install a HRV system) was to put Insulation panels on the roof and THEN felt over them but that plan went out the window when my engineer said I'd have to drill through the panels and install the slate type roof ventilators to allow the roof to breath.
Anyway, from my preliminary BER, I've to put x amount of insulation between the rafters to get the roof u value within limits. My concern is that yes, i may get the u value within limits but what about the house air tightness?????
From reading here and researching on line, I came across the spray foam type insulation which if all the info on it is to be believed, should solve my insulation and air tightness concerns in one go. Only one company I have come across so far has the important BBA cert. I've not seen any with a IAB cert.
So, has anyone used the foam spray insulation to achieve what I want to achieve????? and most importantly, has anyone suggestions how to satisfy the roof breathing concerns my engineer has.
Thanks for reading and looking forward to all replies.
I'm currently building an ICF Dormer style house. All walls are complete and roof has just been felted.
My original plan to achieve good air tightness and insulation levels (as going to install a HRV system) was to put Insulation panels on the roof and THEN felt over them but that plan went out the window when my engineer said I'd have to drill through the panels and install the slate type roof ventilators to allow the roof to breath.
Anyway, from my preliminary BER, I've to put x amount of insulation between the rafters to get the roof u value within limits. My concern is that yes, i may get the u value within limits but what about the house air tightness?????
From reading here and researching on line, I came across the spray foam type insulation which if all the info on it is to be believed, should solve my insulation and air tightness concerns in one go. Only one company I have come across so far has the important BBA cert. I've not seen any with a IAB cert.
So, has anyone used the foam spray insulation to achieve what I want to achieve????? and most importantly, has anyone suggestions how to satisfy the roof breathing concerns my engineer has.
Thanks for reading and looking forward to all replies.