Rim joist spray foam insulation in Lacombe treats the band of timber sitting on top of the foundation. On the older housing in this town that band is doing something it does not do on a modern house, and it is the reason this small item is the first one worth buying.
The bottom end of a house that is open to the roof
Where the walls above are balloon framed, the joist bays at the foundation are not a dead end. They open into the wall cavities, and those cavities run the full height of the building. So the band is not simply a leak into the basement, it is the intake for the whole house, and every stream of cold air entering there is on its way upward through the walls. Closing it changes conditions on floors nobody has been working on.
What is in there now on a house of this age
Open a basement ceiling on one of these streets and the bays hold anything or nothing: original material long since compressed, a piece of batt from a renovation, newspaper, or bare timber. None of it seals, and on a house this old the joint between the sill plate and the top of the foundation has frequently opened slightly as the building settled. Foam applied as a liquid gets into that joint and stays stuck to both surfaces, which is exactly what the detail needs and what nothing fitted can do.
Additions and porches each bring their own band
Houses here have grown over a century. A back addition, an enclosed porch, a lower level put in under part of the building, a garage attached at some point. Every one of those has its own band and its own junction with the original structure, and those junctions are the least likely part of the whole house to have been sealed by anybody. They get done in the same visit, because sealing one and leaving the others simply moves the draught.
Reached in a day where the basement is open
The practical argument is access. In an unfinished basement the bays are visible from below, there is nothing to demolish and the work is generally done in part of a day. Where a Lacombe basement has already been finished it is a different conversation and the cost of reaching the band is real. Anyone planning to develop a basement in one of these houses should do this before the ceiling goes up, not after.
Rim Joist Spray Foam Insulation Lacombe: Common Questions
Why does this matter more on an older house? Because the joist bays open into wall cavities that run to the roof. It is the intake for the whole building.
What does it cost to reach a rim joist behind a finished ceiling? Then reaching it is a real cost and it gets priced honestly rather than glossed over.
How long does it take? Usually part of a day where the ceiling is open, with no demolition.
Size the assembly with the R-value calculator, then get a free Lacombe quote. More on Rim Joist Spray Foam Insulation Alberta.