For an uninsulated attic, it’s important to install a vapour barrier on the interior side of your roof before filling it with insulation.
When installing your batts, make sure to fit them tightly end-to-end as gaps in the insulation can greatly reduce your R-value. Make sure you don’t block any ventilation areas.
For electrical areas, slide the batts under the wires wherever possible, keeping it away from vents, exhaust fans, chimneys and any other heat-emitting objects and light fixtures. For exact information, consult your local building codes.
Alternatively, you could use loosefill insulation instead of laying down batting. Brands like Owens Corning can be blown in with the proper machinery and when they’re applied this way, the insulation doesn’t settle, ensuring consistent and long-lasting insulation for years to come.
Ensure you use a foam sealant to seal and insulate around any attic windows. You can attach rafter vents - if needed – at the eaves of every joist to ensure optimal ventilation.
If your attic just needs a top up, you can apply a second layer of batting perpendicular to your current one. Just lay the new batting right on top of your current, between-joist batting.
When insulating, check to make sure that your insulation fits snug to the boards and joists for optimal energy efficiency.
Follow the same rules as if you were doing it from scratch (above) and ensure that all spaces are covered and that there aren’t any gaps.