Attic spray foam insulation in Crossfield is almost always work at the edges of the attic rather than in the middle of it. The flat area over the ceiling is the easy part and it is usually adequate on anything built in the last thirty years. The eaves are not, and on a town laid out across open prairie with nothing to break the wind, the eave is where the attic gives up.
Wind washing at the heel
Where the roof meets the wall there is a wedge of space only a few inches tall. Soffit vents sit directly outside it, by design, so outdoor air arrives there first and under pressure. Loose insulation in that wedge gets pushed back, thinned and in bad cases blown clear of the top plate entirely, leaving the coldest, thinnest part of the ceiling exactly over the outside wall of the room. That is the mechanism behind cold outside walls, cold corners and the frost line that appears on the ceiling two feet in from the wall. A sheltered house does this slowly. An exposed Crossfield lot does it fast and keeps doing it.
Depth at the heel is a geometry problem
On a truss roof with a standard heel there is simply not room at the edge for the depth the flat area carries, so the assembly is thinnest at the point where the temperature difference is greatest. No amount of blown material fixes that, because the space is not there. Closed-cell foam does, because at roughly R-6 to R-7 per inch it reaches a usable R-value in the inches available, and because it holds its position against incoming air instead of being displaced by it. Sprayed at the heel it also becomes the air seal over the top plate, which is a second leak nobody can see.
Older roofs in the townsite grid have their own edge
On the pre-1991 houses near the rail line the problem is often not a truss heel but a roof framed with rafters over a low knee wall, or a storey-and-a-half with sloped ceilings behind the upstairs bedrooms. Those spaces have no flat attic to add depth to at all. The insulated plane runs up the slope, behind the knee wall and across the small flat above, and in houses of that age there is usually nothing sealing the knee wall cavity from the eave. Air enters at the soffit, runs up behind the bedroom wall and out the top. Foam on the sloped plane and across the knee wall cavity closes the path; adding material to the little flat section does nothing about it.
Baffles, bath fans and the stack
Three items get checked on every Crossfield attic regardless of age. Ventilation baffles, because sealing at the heel without maintaining a clear air path at the roof deck trades one problem for another. Bathroom fan ducting, because a fan terminating in the attic instead of through the roof puts the household's moisture directly onto a cold deck, and under chinook cycling that water sits, releases and refreezes repeatedly. And the plumbing stack penetration, which is a hole with warm air going up it every hour of the winter.
We take care of the work
For attic spray foam insulation Crossfield, we quote and manage the whole job and our own installers do the work. The free quote comes from the people who will be on site.
Attic Spray Foam Insulation Crossfield: Common Questions
Why is the ceiling cold near the outside wall but fine in the middle? Because the insulation is thinnest where the roof meets the wall and outdoor air arrives there first. The middle is deep and sheltered; the edge is shallow and exposed.
Can blown insulation be blown around by the wind? At the eave, yes. That wedge sits right behind the soffit vents and loose material gets displaced there, which is why the fix at the edge is a material that stays put.
Our upstairs has sloped ceilings and no real attic. What then? Then the sloped plane and the knee wall cavity are the job. There is no flat area to add depth to, and the air path behind the knee wall is usually the actual fault.
How much does attic spray foam insulation cost in Crossfield? Attic work prices as board feet of sprayed foam at the edges plus any blown depth over the flat, so the number follows area and target R-value. On most Crossfield attics the sprayed portion is the perimeter and the penetrations, not the whole ceiling.
How do I choose an attic spray foam contractor in Crossfield? Ask what they plan to do at the eave and whether baffles are included. A quote that only prices the open flat is pricing the part that was not broken.
Size the job with the R-value calculator, then get a free Crossfield quote. More on Attic Spray Foam Insulation Alberta province-wide.