About 74% of homes in Barrhead were built before 1991, so most of the roof spaces in this town were framed and vented to a standard set a long time ago. Attic spray foam insulation in Barrhead is retrofit work on those roofs, and the detail that decides the outcome is not how much material is lying on the ceiling. It is how much air is getting past the ceiling, and how little chance that air has of ever leaving the attic again.
A sheltered roof is a roof that barely ventilates
Attic ventilation is almost entirely wind-driven. Soffit vents and a ridge or gable outlet work because air is being pushed in one side and drawn out the other, and the amount of air that actually moves depends on there being wind at roof level to do it. Barrhead houses sit among mature spruce and poplar, on lots and acreages where the shelter is the whole point of the planting, and at roof height on a still January night there is close to nothing driving that flow.
So whatever moisture reaches the attic tends to stay in the attic. It arrives as humid house air, it condenses or frosts on the cold underside of the sheathing and on the nail points, and it accumulates over weeks because there is no wind-washing to carry it away. The homeowner finds it in March as damp patches on the top of the insulation, stained sheathing, or a dusting of frost that reads as a leak. The roof is intact. The ceiling is leaking.
The chimney chase is the biggest single hole on this stock
On houses from this era there is very often a chase that used to carry a wood or oil-fired chimney, and whether or not the chimney is still in service the hole cut around it through the ceiling and the attic floor usually remains. It was framed to give clearance to something hot, which means it was deliberately left open, and nobody closed it afterwards. It is a vertical shaft from the warmest part of the house straight into the coldest part of the roof, and it runs every hour of a heating season that starts in September here.
The repair is not insulation. It is a proper fire-safe closure at the ceiling plane with sealing around it, and then insulation over the top of that. A quote that proposes to blow insulation across an open chase has made the problem invisible rather than smaller.
The rest of the ceiling plane, and the tenants
The top plates where interior partitions meet the ceiling, which on older framing are frequently open into the wall cavities below. The plumbing stack. A bathroom fan added in a renovation and left terminating under the roof. Recessed lights put into a kitchen ceiling in the eighties. Each one is small; together they are a continuous opening.
There is also a problem specific to building in the bush. Mice and red squirrels get into attics from overhanging branches and along service lines, and fibrous insulation is nesting material to both of them. We routinely open attics here and find tunnelled, matted batt with runs through it. Foam is not a rodent product and we would not sell it as one, but a sealed ceiling plane removes the warm air current that leads them to the openings in the first place, and it does not shelter a nest the way a loose blanket does.
Why depth on its own disappoints here
Air leaving through the ceiling goes straight up through anything laid on top of it. Add a foot of material over a leaking ceiling in a poorly ventilated attic and you have insulated the moisture problem rather than fixed it. The order that works on a Barrhead house is to close the chase, seal the penetrations, check that the soffits are actually open and not packed solid, and only then build depth across the flat where depth is inexpensive.
The crew on your job
We are the contractor on attic spray foam insulation Barrhead, not a referral service. We quote the job, schedule it and stand behind it, and our own installers carry it out.
Attic Spray Foam Insulation Barrhead: Common Questions
There is frost on the underside of our roof boards. Is the roof leaking? Almost certainly not. House air is getting into the attic and depositing moisture there, and a sheltered roof moves too little air to clear it, so it builds up all season.
What is the chase beside our chimney for? It was framing clearance for the flue. On houses of this age it is usually still open into the attic and it is often the largest single leak in the ceiling.
Our attic is full of insulation and the house is still draughty. Insulation does not stop air; air sealing does. Depth sits on top of the leaks rather than closing them.
How much does attic spray foam insulation cost in Barrhead? Attic work prices as board feet of sprayed foam at the penetrations and wherever depth will not fit, plus blown material on top, so the figure follows area and target R-value. On this stock the chase and the top plates are small items that do most of the work.
How do I choose an attic spray foam contractor in Barrhead? Ask what they found at the chimney and whether the soffits are clear. Anyone who quotes a depth without having been into the attic has not seen the part that is costing you.
Size the job with the R-value calculator, then get a free Barrhead quote. More on Attic Spray Foam Insulation Alberta province-wide.