Where A New Build Loses Heat Is Not Where The Batts Go
A framed wall filled with batts insulates the middle of each stud bay well and the edges badly. The rim joist, the corners, the headers over windows, the cantilevers and the cathedral ceilings are where a new house actually leaks, and none of them take a batt well. Closed cell spray foam insulation fills every one of them to the sheathing, seals the air path and adds racking strength to the frame at the same time. The rest of the wall can then be filled with open cell foam, closed cell foam or a batt, depending on the budget and the target R-value.
Spray Foam Insulation Under Cathedral Ceilings And Cottage Rooflines
Half the new builds around the lakes have a vaulted great room with the roof deck exposed above it. A vented cathedral ceiling in snow country is hard to get right and easy to get wrong, and the result is frost, drips and stained pine. Spray foam insulation sprayed to the underside of the roof deck makes an unvented roof that stays dry, meets the code depth in a shallower rafter, and never settles. It is the most common spray foam job on a new cottage in Orillia and the one where the product earns its price most clearly.
Meeting Current Ontario Code On The First Try
Ontario's code sets minimum effective R-values for attics, walls and basements in new work, and a builder can meet them with several combinations of products. Foam lets a standard two by six wall or a two by ten rafter hit the number without furring out the framing, and closed cell foam in the basement covers insulation and vapour control in one inspection. We work from the drawings, state the thickness for each assembly in the quote, and the depth gauge on the day confirms it.
Scheduling On A New Build
The foam goes on after the rough-ins pass inspection and before the drywall is booked. A whole house is usually two days, an addition one. The space is ventilated while the foam cures and nobody works in it until it has, so we set the dates with the site supervisor rather than showing up between trades. Where the plans call for a thermal barrier over the foam, the drywall crew provides it, and we confirm that hand-off in writing.