Bonus room spray foam insulation in Claresholm is a small slice of the work and almost all of it is on the newer houses at the edges of town — the infill and the acreage builds that put a room above an attached garage. The complaint is always the same and the cause is almost never where the owner is looking.
The room is cold because the floor is
People report an upstairs room that will not warm up and assume the ceiling or the roof is the problem. On a room over a garage it generally is not. That floor has heated room above it and an unheated garage below it, which makes it part of the building envelope — and it is the one envelope surface that gets built like an interior floor.
The joist bays run from the house wall out over the garage. In most of them the batt was pushed up against the subfloor, or it sagged, or it was never installed over the last bay at all because the drywaller got there first. Underneath there is garage ceiling board with gaps at the perimeter. So you have a cold air space in direct communication with the garage, separated from your feet by a layer of insulation that is not continuous and is not sealed to anything.
Cold air moves along the joist bays
Here is the mechanism that makes it worse than the numbers suggest. Those joist bays are open channels. At the outside end they often connect to the soffit or to the rim at the garage wall; at the inside end they run into the wall cavity of the house. Air entering at the exposed end travels the length of the bay under the floor, stripping heat as it goes, and there is nothing in a batt-filled bay to stop it.
That is why a bonus room floor measured with a thermometer at the register looks fine and the room still feels cold at the skirting. Insulation slows heat through a material; it does not stop air moving around it. Closed-cell foam sprayed to the underside of the subfloor adheres across the full width of each bay and closes those channels, which is the part that changes how the room feels.
There are three other surfaces, and they all count
A bonus room over a garage typically has a sloped ceiling following the roof line, two small kneewall sections behind the side walls, and the end gable. Every one of those is an envelope surface with attic or outdoor conditions on the far side, and the kneewalls are the ones that get skipped because they are behind a stud wall nobody opens.
West-facing gables deserve a particular mention around Claresholm. Late afternoon sun off the open ground toward the Porcupine Hills loads that wall hard in summer, and a sloped ceiling with a shallow cavity above it has very little capacity to absorb it. Dealing with the room as a complete six-sided box is the only approach that actually works.
Do it in one visit if the ceiling is open
If the garage ceiling is already coming down, or the room is being finished for the first time, that is the moment. Opening a garage ceiling later to reach the floor is most of the cost of the job, and the floor is the surface worth paying for. If it is staying closed, we would rather tell you that up front than quote the ceiling and let you discover the floor next winter.
One company, start to finish
We quote the job, schedule it and stand behind it, and our own installers do the work on bonus room spray foam insulation Claresholm. You deal with us from the first site visit to the last pass of foam.
Bonus Room Spray Foam Insulation Claresholm: Common Questions
The room over our garage never warms up. Where do we start? Underneath. The floor between the room and the garage is the envelope surface, and in most houses it is the one that was built worst.
Why does adding more batt not help? Because the joist bays are open channels and air moves along them. Depth does not close a path; an adhered layer does.
Do the kneewalls matter? Yes, and they are usually untouched. Behind each one is attic space at outdoor temperature with nothing sealing the stud cavities.
How much does bonus room spray foam insulation cost in Claresholm? Priced per board foot over the sprayed surfaces, so the number follows how many of the six surfaces are in scope and whether the garage ceiling has to come down to reach the floor.
How do I choose a bonus room spray foam contractor in Claresholm? Ask whether the floor over the garage is in the quote. If the proposal is only the sloped ceiling, it is addressing the surface that was already insulated.
Size the assembly with the R-value calculator, then get a free Claresholm quote. More on Bonus Room Spray Foam Insulation Alberta province-wide.