Attic spray foam insulation in Strathmore is mostly work on houses built in the last thirty years, on open ground where there is nothing between the roof and the weather coming off the plain.
Nothing upwind, and what that does above the ceiling
An exposed site changes an attic more than it changes the rest of a house. Wind entering at the eave does not simply pass through a vented attic, it drives into the insulation at the perimeter and lifts the fibres, and loose fill on an open lot ends up thinner at the edges than it was the day it was blown in. That is wind washing, it happens where the ceiling is already shallowest because of the truss heel, and it is why the perimeter of a Strathmore attic frequently performs well below whatever number is written on the invoice.
The gable vents, which face the wind here
Most roofs in this town carry vents in the gable ends as well as at the eave, and on an open lot at least one of those gables is facing whatever is coming across the plain. That turns a vent designed to let air drift out into an opening that air is being pushed through, which is a different thing entirely. The result is a roof space that is scoured rather than ventilated, insulation disturbed around anything near that end of the building, and driven snow finding its way in during a storm and sitting on the ceiling until it melts. Establishing which vents are on the pressure side, and how they are screened and baffled, is worth doing before anything is added above the ceiling.
Baffles, and whether anybody fitted them
Where insulation has been blown into a truss attic without baffles at the eave, two things happen at once: the material blocks the airflow the roof needs, and the airflow that does get through blows the material around. Both are common here and both are cheap to correct at the same time as anything else. It is the single most useful thing to look at on a first visit, and it is visible in about a minute from inside the attic with a light.
What to do about a ceiling that is already at its number
On most houses in this town the honest scope is not more depth. It is sealing the plane, baffling the eave properly, and restoring the depth at the perimeter where the wind has thinned it. That is a smaller and cheaper job than the one people ring about, and on an open site it produces a change the household actually notices, because the perimeter of the ceiling is where the rooms feel it.
Attic Spray Foam Insulation Strathmore: Common Questions
Why did blown-in insulation not help much? Check the perimeter and the baffles. On an exposed lot the edges thin out and the eave gets blocked.
Should we just add more? Rarely. Sealing the plane and fixing the eave does more than depth on a ceiling already at its number.
How would we know? A look in the attic with a light. The eave and the hatch tell you most of it in a minute.
Size the assembly with the R-value calculator, then get a free Strathmore quote. More on Attic Spray Foam Insulation Alberta.