Jump to content

Garage roof insulation - why?


Adam2

Recommended Posts

Quick one - my architect has spec'd sloping insulation in the garage roof - it will NEVER be converted into a "room". A - sloping = more costly vs the timbers being at an angle so that's mad and B - why even think about this? To me seems a bit odd as the construction is regular single skin blockwork with the side against the house being the house's ICF exterior wall. It will house 1 of our MVHR units but I checked and the supplier says no problem in a regular garage. I would have thought that a garage constructed like this would get to external air temp quite quickly with or without an insulated roof as the double door will not be anywhere near air-tight.

 

Am I missing something in my understanding?

 

This only came to light when I asked for a drainpipe to be moved and saw the detail in the roof structure.

 

Thanks

Link to comment
Share on other sites

What’s the roofing materials?, could be to stop condensation dripping inside. I used roofing felt under my metal roofing on my garage to stop any condensation dripping on my tools etc.

Link to comment
Share on other sites

so if this roof is  going to be a flat one  ,then one would presume its a GRP  skinned type 

tin roof needs a bigger slope or it won,t work  correctly 

so if it  is osb +grp and no insulation --you could easily get condensation on the OSB inner skin -- not a good idea 

I know cos that how my garage was built --hellish hot in summer and cold as hell in winter-I got seconds +co insulation and jammed it up between the rafters --

much more civilised now and no freezing of tap in there ,then bursts  in garage in winter 

the taper insulation does not give a big slope ,certainly much less than you would need with a tin one  and cuts out condensation problem 

something to ponder 

 

Link to comment
Share on other sites

22 hours ago, scottishjohn said:

presume its a GRP  skinned type 

He said Alwitra, and given the sloping insulation spec I’d guess it’s warm roof construction....possibly in line with rest of house.  So maybe the insulation has to be outside the deck if at all.  I’d guess if tell architect to ditch insulation he’ll do a condensation risk analysis if any doubts.

Link to comment
Share on other sites

Thanks - very helpful info. @scottishjohn just not sure that only insulating the roof and  not the other 3 sides (1 side is against the house) will help with temp? Another factor is that the garage is mostly elevated - it extends out on a slope supported on a steel frame so the underside (beam+block) will get cold so adding to the argument I think that just insulating the roof may not make much difference 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...