Attic Heat Loss In Orillia Shows Up On The Roof First
We look at the roof before we look at the attic. A roof that melts its snow in a stripe up the middle while the eaves stay white has warm air reaching the sheathing from below, and the stripe usually maps to the ceiling below it. Bathroom fans venting into the attic, ductwork running through it, and top plates with no seal are the usual sources.
Attic spray foam insulation deals with all three. Closed cell foam seals the top plates, the penetrations and the hatch perimeter, and either the attic floor is then built up to the depth the code asks for, or, where ducts and equipment live in the attic, the underside of the roof deck is sprayed and the whole attic is brought inside the heated house.
Attic Floor Or Roof Deck: The Attic Decides Where The Spray Foam Insulation Goes
A plain attic with nothing in it but framing gets spray foam insulation across the floor, with the sealing pass first and the depth built up after. It is the less expensive job and it leaves the attic cold and vented, which is how a roof in snow country wants to be.
An attic with a furnace, an air handler or the main supply trunk in it is a different case. Every foot of duct up there is losing heat into a cold space, so the better job sprays closed cell foam to the underside of the roof deck and turns the attic into conditioned space. The ductwork comes inside the envelope, the roof still stays cold on the outside, and the ice dams stop. We price both options when both apply.
Frost And Mould On The Underside Of The Roof
Frost on the roof sheathing in February, and the black staining it leaves by April, come from moist house air reaching a cold deck. Orillia sits between two lakes and the indoor humidity that comes with that gives the frost plenty to work with. Sealing the ceiling with foam cuts the moisture off at the source. Where the staining has already started, we will tell you what needs cleaning before the attic is closed up again.
The Attic Spray Foam Insulation Visit In Orillia
We go into the attic, measure the area, check the depth of what is there, look for wet spots and old rodent damage, and check the bathroom and kitchen exhaust runs. The written quote separates the sealing pass, the insulation depth and any removal of failed material so you can see what each part costs. If the existing batts are dry and sound, we say so and leave them in place under the foam.