About 70% of homes in Cardston were built before 1991, and in an attic that statistic has a very practical meaning. A house of that age has usually been added to at least once, which means what the owner calls the attic is actually two or three separate roof spaces at different heights, joined by walls that used to be exterior walls.
There is rarely one attic up there
The original house gets a rear addition, then a porch is enclosed, then a bedroom goes over part of it. Each stage was roofed separately. The result is a main attic you can walk in, a low space over the addition you cannot, and a short run of roof between them with almost no depth at all. Insulation gets topped up in the part that is easy to reach, and the awkward sections keep performing the way they always did. On this stock the cold rooms are almost always under the parts nobody could get to.
The old exterior wall is now a hole
Where an addition meets the original house, the wall between them is often still a framed exterior wall with its top plate open to the roof space above. That plate line is a continuous slot from the heated house into the attic, and it runs the full width of the junction. It is invisible from inside the house and obvious from above once the insulation is pulled back. Sealing it is usually the single most valuable thing done in an older attic here, and it is the thing a depth top-up never touches.
Check what is already up there before anything is disturbed
Attics on pre-war and early post-war houses sometimes hold loose fill that is not fibreglass: sawdust, wood shavings, slag wool, or a granular mineral fill. Loose granular fill in an attic of that era should be tested rather than assumed, because some of it carries asbestos, and disturbing it is the wrong way to find out. We will say plainly if we think something needs testing before we work, and we will not spray over an unknown material and call it solved.
Chimneys, knee walls and the bits that are not flat
Older houses here commonly have a masonry chimney running through the roof space, a knee wall on either side of a finished upper storey, and a stair bulkhead. None of these are flat attic floor. A knee wall is an insulated wall with unconditioned space behind it, and on most houses of this vintage it has batt pushed into the studs with nothing on the cold face, so air moves freely through it. These are foam details: adhered, sealed to the framing, continuous around the corner where the floor meets the wall.
Why depth alone disappoints on this stock
Insulation slows heat conduction. It does nothing about air moving through a hole, and an older house with additions has a lot of holes in its ceiling plane. Blow another layer across the flat and the warm air leaving through the plate lines, the chimney chase and the stair bulkhead keeps leaving. The owner pays for material, feels very little, and concludes the attic was a waste. The depth was not the problem.
The crew on your job
You are dealing with the contractor directly on attic spray foam insulation Cardston. We quote the job, we schedule it, and our own installers do the work.
Attic Spray Foam Insulation Cardston: Common Questions
One bedroom is cold and the rest of the house is fine. Why? Usually because that room sits under a section of roof added at a different time, with less depth and an open wall plate feeding it. That is an access and sealing problem, not a depth problem.
There is grey granular fill in our attic. Can you just spray over it? No. Older granular fill should be identified first, because some of it contains asbestos. Testing comes before any work that disturbs it.
Do we need the whole attic sprayed to full depth? Rarely. The usual job is foam at the junctions, the plate lines and the knee walls, with blown depth over the open flat where the depth is all that is missing.
How much does attic spray foam insulation cost in Cardston? Attic work is priced per board foot over the sprayed area plus the blown depth on top, so the number follows area and target R-value. On an older house with additions, access to the low sections is what moves the figure most.
How do I choose an attic spray foam contractor in Cardston? Ask how many separate roof spaces your house has and how they plan to reach the lowest one. Anyone who has not been up there cannot answer that, and that answer is the job.
Size the job with the R-value calculator, then get a free Cardston quote. More on Attic Spray Foam Insulation Alberta province-wide.