My woodworking shop is ready for insulation. I am on a strict budget and you’ll find I gravitate towards the edges of normality. With that in mind…
The shop is 26′ by 32′ with 10′ sidewalls. Wood and tin at present. I am installing a continuous vent at the peak. Looking up I pondered the following. I could follow the rise of the roof by attaching rigid insulation to the bottom of the 2×4’s that support the roof tin. The rafters would be exposed. I would add a two inch foam with a foil facing to the 2×4’s. The 2×4 roof support cavity would not be insulated and the ribs in the roof steel will allow for ventilation from the outside to the peak. The foam will be a vapor barrier with sealed and taped joints.
As budget allows (in the future) I can add more insulation to the bottom side. I would leave the reflective foil surface as my ceiling. I plan to insulate the walls in the same way – with the addition of a 4′ plywood sheet attached to the wall base to protect the insulation.
I’d like your input regarding the functionality of this idea. I live in Wisconsin so heat and cold are concerns. I am heating an insulated concrete section of the floor. Shop space ventilation in the rafter peak – exhaust fan and windows.
My current shop is around 60 degrees in the Winter – -just right for working. I warm it up for finishing.
I could use Poly Iso but do not like the manufacturing process – not too easy on the environment. Any recomendations? Needs to have the foil facing.