The rim joist is the band of framing that sits on top of the foundation wall and carries the floor above it. In Langdon it has a particular significance, because so many of these houses are young, bought by households that will develop the basement themselves within a few years, and the week that development starts is the week the rim joist becomes unreachable. Rim joist spray foam insulation in Langdon is the smallest job on the list and the one with the shortest window.
The surface that disappears behind somebody's new wall
Walk into an undeveloped Langdon basement and the rim joist is visible all the way around the perimeter, at eye level, with nothing in front of it. Come back after a weekend crew has studded, wired and boarded the space and it is behind a finished wall with a vapour barrier over it. The work that would have taken part of one morning now begins with demolition. Nothing else in the house changes status that completely, that quickly, for that little reason.
Why it is the coldest line in a new building
Everything about this detail works against it. It is framing lumber, not insulation, so there is no thermal value in the member itself. It sits directly on concrete that is in contact with soil. It is the junction of three planes, so it carries the seams of the sheathing, the sill and the subfloor at once. And the sill plate rests on a foundation top that is never perfectly flat, which leaves a gap that runs the full perimeter of the building. Closed-cell foam is well suited to it because it bonds to concrete, wood and steel alike and seals the irregular gap instead of bridging over it.
The cantilever and the deck ledger
Two variants deserve naming because Langdon plans are full of them. Where a bay window, nook or upper floor projects past the foundation, the floor cavity beneath it is open to outside air on three sides, and that assembly needs treating as a floor over exterior rather than as a rim. And where a deck is bolted to the band joist, the fasteners and the flashing have punched the plane repeatedly. Both show up as a cold floor in a specific room, which is how the complaint usually reaches us.
What the occupant notices afterwards
Not a dramatic change in the heating bill, which we would rather say in advance. What people report is that the basement stops smelling like a basement, that the floor at the perimeter of the main level loses its chill, and that a room above a cantilever stops being the room nobody sits in. On a young house with insulation already in the walls and attic, this detail is a disproportionate share of what is left to fix.
Who you are dealing with
There is no handing you off here. We quote and manage rim joist spray foam insulation Langdon start to finish, and our crews do the spraying.
Rim Joist Spray Foam Insulation Langdon: Common Questions
Is this worth doing on its own? It is one of the few items worth a visit by itself, though on an acreage it makes more sense to have it done alongside anything else on the parcel.
Can batt be used instead? It can be installed there, but it cannot seal the gap along the top of the foundation, and that gap is the reason the detail is cold. Fibrous insulation in that position also sits against a surface that gets damp.
We are about to finish the basement. What is the order? Rim joist and foundation wall first, then frame in front of it. Doing it the other way round means paying twice.
How much does rim joist spray foam insulation cost in Langdon? It is priced per board foot over the sprayed band at the depth the detail needs, so the number follows the perimeter of the house and little else. It is the smallest scope we quote and generally the first thing we recommend.
How do I choose a rim joist spray foam contractor in Langdon? Ask whether the quote includes the cantilevers and the deck ledger or only the straight runs. Those are the parts that cause the specific complaints.
Size the detail with the R-value calculator, then get a free Langdon quote. More on Rim Joist Spray Foam Insulation Alberta province-wide.