Hi there
I am trying to make a decision on how best to upgrade the shallow mono-pitch roof on my bungalow. I'm hoping for abit of advice if possible!
The existing roof (100 metre sq) across the whole property is a cold deck construction, with rockwool insulation packed tightly between joists. The cold deck is not ventilated.
Essentially, I am hoping that it will be possible to build a new 'warm roof' construction over the existing roof (leaving the mineral felt, and existing insulated 'cold deck' in place). The roof covering would be zinc.
What is keeping me awake at night is the concern about condensation. The current cold deck is insulated but not ventilated. There is no vapour check. I'm hoping that with new insulation added over the top, the existing felt will act as a sufficient vapour check (albeit above the existing rockwool & ply)?
I'd really value any input on this. Thanks in advance for your help!
I am trying to make a decision on how best to upgrade the shallow mono-pitch roof on my bungalow. I'm hoping for abit of advice if possible!
The existing roof (100 metre sq) across the whole property is a cold deck construction, with rockwool insulation packed tightly between joists. The cold deck is not ventilated.
Essentially, I am hoping that it will be possible to build a new 'warm roof' construction over the existing roof (leaving the mineral felt, and existing insulated 'cold deck' in place). The roof covering would be zinc.
What is keeping me awake at night is the concern about condensation. The current cold deck is insulated but not ventilated. There is no vapour check. I'm hoping that with new insulation added over the top, the existing felt will act as a sufficient vapour check (albeit above the existing rockwool & ply)?
I'd really value any input on this. Thanks in advance for your help!