Hi, the roof of my house is being retiled and felted with a breathable membrane.
The house is a period property with yorkshire stone roof, however it has suffered from dry rot in parts.
Now seems the perfect time to add insulation as it has none.
I measured the roof trusses gap and it is around 5.8 - 7 cm. in parts.
I ordered 45mm kingspan insulation and left a gap to allow airflow to prevent any condensation.
As I understand I will need a vapour barrier before installing the insulation on the warmer side.
Would I see any benefit in installing multi layer foil insulation and using as the vapour barrier instead of a plastic roll?
I have looked on the internet and it appears that single foil / bubble wrap causes condensation whereas multi foil does not?
Also I notice it is questionable as to how well it works, however surely it should work well for reflecting radiant heat?
The price of the foil is £120 so it does not appear too expensive.
Any advise would be great.
The house is a period property with yorkshire stone roof, however it has suffered from dry rot in parts.
Now seems the perfect time to add insulation as it has none.
I measured the roof trusses gap and it is around 5.8 - 7 cm. in parts.
I ordered 45mm kingspan insulation and left a gap to allow airflow to prevent any condensation.
As I understand I will need a vapour barrier before installing the insulation on the warmer side.
Would I see any benefit in installing multi layer foil insulation and using as the vapour barrier instead of a plastic roll?
I have looked on the internet and it appears that single foil / bubble wrap causes condensation whereas multi foil does not?
Also I notice it is questionable as to how well it works, however surely it should work well for reflecting radiant heat?
The price of the foil is £120 so it does not appear too expensive.
Any advise would be great.
