Attic spray foam insulation in Wetaskiwin is work on genuinely old roof spaces. About 72% of homes here predate 1991, and unlike most towns on this site that is not a share of the stock, it is effectively the stock.
Four owners have added something and none of them sealed anything
On a Wetaskiwin house that has been through several hands there is rarely one insulation layer. There is whatever the builder put in, something blown over it in the seventies, a batt run added when somebody did the bathroom, and a patch where a previous owner ran a cable. Together they add up to a depth that sounds adequate on paper, and underneath the whole stack is a ceiling nobody has ever treated as an air barrier. Depth was accumulated. Sealing was never done, by anybody, at any point.
A roof that has been re-covered more than once
On a Wetaskiwin house of this age the roof itself has usually been done two or three times, and each of those left something behind in the space underneath. New sheathing over old with the original still in place, a ridge vent added at one point and a set of static vents from an earlier one still sitting alongside it, and occasionally an old chimney flashing left in a roof that no longer has a chimney. The consequence is a roof space with more openings than any single design would have given it, some of them working against each other. Establishing what the ventilation is actually doing, rather than what the current arrangement was meant to do, is most of the assessment.
Knob and tube, and why it gets established first
On a stock this old it has to be checked before anything covers anything. Where original wiring is still live in a ceiling, no insulation goes over it until an electrician has established what is there and dealt with it. That is not a formality and it is not negotiable, and it is one of the few places on this site where the honest answer to an enquiry is that somebody else needs to attend before we can quote.
Where the eave was blocked by somebody's top-up
Almost every one of these has had material blown in at some point without baffles at the eave, which means the roof has stopped ventilating the way it was designed to. It is visible in a minute with a light, it is cheap to correct alongside anything else, and it has to be done as part of sealing the plane, because a sealed ceiling under a blocked attic is a worse assembly than the one it replaced.
Attic Spray Foam Insulation Wetaskiwin: Common Questions
Why did topping it up not fix it? Most houses here have. What matters is what it was topped up over, and that is rarely sealed.
Is there old wiring up there? On this stock it has to be established before anything is covered. An electrician goes first.
Should we add more depth? Rarely. On an old ceiling full of penetrations, sealing does far more for less.
Size the assembly with the R-value calculator, then get a free Wetaskiwin quote. More on Attic Spray Foam Insulation Alberta.