Ceiling spray foam insulation in St. Albert is the job for the ceilings an attic crew cannot get to. The multi-level plans that fill this city put ceilings in positions a simple house does not have, and those are reliably the surfaces an owner is calling about.
A stepped plan puts ceilings in odd places
Where a house changes level, a ceiling ends up under a floor at a different height, under a landing, or beneath the short run of roof joining two parts of the building. Each of those is an exterior surface behaving as a ceiling, and each was insulated, if at all, to whatever was convenient during construction. None of them connect to the main attic, so nothing done through the attic hatch reaches them, and a plan drawing does not show which ones are exposed.
The low-slope link between two roof levels
The commonest single problem is the shallow roof section joining a higher part of the house to a lower one. It has a cavity a few inches deep, no access, frequently no air barrier and no way to vent it properly. It is the surface most likely to be over the room somebody has stopped using in winter, and it cannot be improved by adding anything to the main attic.
Under a canopy the vents are the part that stops working
A vented ceiling assembly depends on air actually moving from the eave to the high point, and that depends on openings staying open. Under the mature tree cover that runs through most of St. Albert they frequently do not. Needles, seed and leaf litter pack into soffit perforations and into the gap above the insulation, and unlike a blocked gutter nobody sees it happen. The assembly then behaves as an unvented one that was detailed as vented, which is the worst of the two. Where a roof is under heavy canopy it is worth either committing to the vented route and treating the openings as something that gets cleared, or building the assembly so that it does not need them.
Vented or unvented, decided before anything goes on
A shallow roof cavity can be built as a vented assembly with a maintained air path above the insulation, or as an unvented one with insulation applied directly to the underside of the deck so the cavity becomes interior. Both are legitimate. Half of each is not, and it is the usual reason moisture turns up in one of these St. Albert ceilings a year or two later. That decision is made on site and it is made before anything is sprayed.
Ceiling Spray Foam Insulation St. Albert: Common Questions
Why is one room cold with no attic above it? On a split-level plan that is normal. It is under a low-slope link or a floor at another level, and the attic hatch does not reach it.
Can we add more insulation up there? Not where there is no room. The question becomes what can be achieved in a shallow cavity and whether it can be sealed.
Vented or unvented? One or the other, settled before anything is applied. Half of each causes the later moisture.
Size the assembly with the R-value calculator, then get a free St. Albert quote. More on Ceiling Spray Foam Insulation Alberta.