The house I bought last year came with an uninsulated 2 car, 2 storey garage out back that I get to use as my workshop. Last year before winter I insulated the lower half, and now as it gets colder I need to get the top half insulated.
The garage will be sporadically heated through the winter, depending on what projects I am working on. I currently am using an electric heater but may upgrade to gas at some later date.
I plan on using Roxul mineral wool insulation, that’s what I used in the downstairs and it worked out well for me. I am finishing up the electrical and then need to start on the insulation. On the outside of the walls is 1.5 inches of styrofoam. The walls are 2×6 and half the rafters are 2×8, the other half 2×6. The roof has only two vents on half the roof (see “workshop outside.jpg”).
My plan is :
1 – install new roof vents on back roof
2 – cut holes in roof joists to connect them for air flow
3 – install rafter vents
4 – install insulation
5 – install vapor barrier
Next I’m not sure. I don’t know what I’m putting on the walls and ceiling, but probably some sort of 1/4″ plywood or maybe even OSB. This loft is only for storage but stuff will be bouncing off the walls so I want it to be relatively durable. I’m not doing drywall because I dislike it.
1 – is the soffit (~2″ width) in the picture big enough for venting the roof? If not what can I do? (That is the back roof, the front roof has a ‘regular’ large overhang and perforated soffit.
2 – do I need to install strapping over the VB on the ceiling before putting up a 1/4″ plywood ceiling? On the walls?
thanks – mark