An attic in the County of Grande Prairie No. 1 spends a long stretch of the year under snow that arrived in autumn and will not leave until spring. That changes which part of the attic matters. On the newer houses around Clairmont the open flat area is usually insulated to a reasonable depth and performing acceptably. The part that fails is the last few feet at the eaves, and almost nothing about a standard attic quote addresses it.
The eaves are where a northern attic goes wrong
Three things converge in that narrow space above the exterior wall. The roof slope has pinched the available depth down to almost nothing, so the insulation is thinnest exactly where the wall below it is trying to hand off. The soffit vents are right there, admitting outdoor air. And the top plate of the exterior wall runs along it as a continuous line of air leakage from the house below. The result is that the coldest, thinnest, leakiest part of the ceiling plane is also the hardest part to reach, and it is where a crawl on hands and knees with a bag of loose fill reliably stops short.
Wind washing strips the first few feet
Blown insulation is a still-air product. Air moving through it carries heat away rather than being trapped, and at the eaves there is an air inlet pointed straight at it. On a windy day the outer edge of a blown attic is doing considerably less than its measured depth suggests, which is why the rooms along an exterior wall feel the wind even with a full attic above them. Baffles at each truss bay are what keep the intake path open while blocking that air from washing sideways across the insulation, and sprayed foam at the top plate is what stops the house air escaping into the same space.
Snow does not only sit on the roof
In a northern winter with drifting snow, soffit vents admit more than air. Fine snow gets driven through the perforations and deposits inside the attic along the eaves, where it later melts against the sheathing or onto the insulation below. Homeowners find a damp patch near an exterior wall in spring and reasonably assume the roof leaked. Often the roof is fine and the water arrived through the vent as snow. Properly baffled bays and a sealed ceiling plane do not stop the snow entering, but they keep it out of the insulation and off the drywall.
Ice damming is a heat problem, not a gutter problem
Where warm house air leaks into the attic it warms the underside of the roof, snow on that surface melts, the water runs to the cold overhang and freezes there, and the ridge of ice that builds up backs the next melt up under the shingles. The fix is not a better gutter. It is keeping the attic cold, which means stopping the house air from getting into it. On a roof that holds snow for months there are many melt and freeze cycles available to do the damage, and that is why this region sees it more than the dry south does.
What the foam actually does up here
It is the sealing layer. Sprayed at the top plates, around the plumbing stack, around bath fan housings, around recessed light cans and at the hatch perimeter, it closes gaps that no cut material will. It is not a bulk depth product on an attic that already has depth. A quote to spray an entire attic to full R is the most expensive version of a job that mostly does not need doing here.
The crew on your job
You are dealing with the contractor directly on attic spray foam insulation Clairmont. We quote the job, we schedule it, and our own installers do the work.
Attic Spray Foam Insulation Clairmont: Common Questions
The attic is full and the house is still draughty. Why? Because depth is not a seal. Air leaves through the penetrations in the ceiling and travels straight through anything laid on top of them.
Why is there damp near the outside wall in spring? Frequently snow that was driven in through the soffit vents and melted, rather than a roof leak. Baffles and a sealed ceiling plane keep it from reaching the insulation.
Will insulating stop ice dams? Air sealing will, by keeping the attic cold. Heat leaking out of the house is what melts the snow that refreezes at the overhang.
How much does attic spray foam insulation cost in Clairmont? Attic work is priced per board foot for the sprayed portion plus any blown-in depth on top, so the number follows area and target R-value. The eaves detailing and the ceiling penetrations are small separate items and they are where the value sits on this stock.
Who does attic spray foam insulation in Clairmont? We do. We go up and look, say whether the eaves are the problem, quote that work and stand behind it.
Size the job with the R-value calculator, then get a free Clairmont quote. More on Attic Spray Foam Insulation Alberta province-wide.