ᐅ Insulating a Garage Roof: Correct Order of Installation

Created on: 3 Jun 2016 10:52
T
tomtom79
I have now had three contractors come to seal our garage roof, and I have received three different opinions and price quotes.

For a 6x6 meter (20x20 feet) garage, the prices range from 1400 to 3800 euros.

I just want a watertight garage that doesn’t develop mold inside.

What is the correct method for sealing a garage roof?

Are two layers of bitumen enough?

Is a layer of insulation required in between?

Is a vapor barrier needed?

How was it done in your case?
S
Sebastian79
6 Sep 2016 10:34
Where do you get 80% humidity outside at -10 degrees Celsius (14°F)? And 50% inside is probably wishful thinking as well.
AOLNCM6 Sep 2016 10:48
Oops, sorry, my mistake. I was a bit too quick. The outdoor humidity obviously needs to be reduced. The one inside the garage, however, should not. The result shouldn’t be much better.

I’ll leave the file as it is anyway. The approach should be clear.
Anyone who wants to check their individual project can do so there.