Roof Space Insulation Saves You Money
Add roof space insulation to lower heating and cooling costs by as much as $600 per year.
Blanket-type insulation comes in different widths. It’s designed to fit with typical framing. Or as a blanket to provide easy DIY installation
Save about $600 per year by boosting the amount of attic insulation from R- 1.5 to R- 3.5. Depending on the type of materials you use, cost will vary however the pay back period is about three years in most average homes. You’ll spend about half that to do the job yourself.
Do you need more attic insulation?
A good, quick way to check if you need insulation is to look across your attic floor. If the existing insulation comes up just to the tops of the joists, then you probably need to add insulation. If you can’t see the joists and the insulation is well above the tops of the joists, you’re probably okay and you won’t recoup the cost of adding more.
Methods for insulating an attic or roof space
Add insulation to your attic one of three ways:
Roll-on or blanket-type insulation comes as rolls of fibreglass batts, come in various widths —designed to fit between the width of typical framing. If your roof space already has some insulation in the attic floor, roll out the batts at right angles to insulate over the framing members.
If you’re doing the job yourself, blanket-type material is easiest to work with. Be careful not to compress it or it won’t be as effective.
Loose-fill or blown-in insulation requires a machine that shoots a stream of loose-fill cellulose over the existing attic floor framing. This is typically a job for an insulation contractor. The advantage is that loose-fill insulation does a great job of filling in small crevices and other hard-to-reach areas.
Sprayed foam polyurethane is an option if you plan to turn your attic into a finished room. In that case, you’ll want to insulate the roof—not the floor. Sprayed foam polyurethane molds to rafters, blocks water vapour, and has a high R-rating per inch. Expect to pay about double the per-square-metre cost of roll-on and loose-fill insulation.
How much attic insulation is enough?
To determine how much to add, look up the recommended amount for your area, then subtract the value of your existing insulation. If you don’t know, you can figure it out using the Home Energy Saver online energy audit tool.
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