Bonus rooms do not exist on Devon's original grid. The planned townsite houses were modest and did not have attached garages, let alone rooms built over them. The bonus room arrived with the later subdivisions on the south and east edges of town, and it brought with it the single most reliably uncomfortable room in modern Alberta housing. Bonus room spray foam insulation in Devon is nearly always about one thing: the floor.
The room is surrounded on five sides
An ordinary upstairs bedroom has heated rooms below it and on at least one side. A bonus room has an unheated garage underneath, outdoor air on two or three walls, and a roof above. Five of its six surfaces face something cold, which means the heat loss per square foot is several times that of the bedroom next door, while the heating system treats it as just another room on the same branch.
The garage ceiling is where it is lost
The floor of the bonus room is the ceiling of the garage, and in a lot of houses that assembly was built with batt pushed up between the joists and nothing holding it there. Over a few winters it sags, leaving an air gap against the subfloor, and then the garage ceiling membrane is all that stands between a January garage and the carpet upstairs. The symptom is a floor that is cold to bare feet even when the thermostat says the room is warm.
Closed-cell foam sprayed up into those joist bays adheres to the underside of the subfloor so there is no gap to sag into, and it seals the perimeter of the bay at the same time, which is the part batt can never do.
The cantilever at the front
Many of these rooms overhang the garage door opening by a foot or two. That overhang is a floor assembly with outdoor air directly beneath it, open at the ends into the joist bays running back into the room. Cold air gets into those bays at the cantilever and travels inward under the floor. Sealing the ends of the bays where they cross the exterior wall line is a small, specific piece of work that changes the room noticeably.
The sloped ceiling above
Bonus rooms usually have a vaulted or partly sloped ceiling following the roof line, so the rafter bay has to carry both insulation and a vent path. There is not enough depth for both in fibre. Closed-cell at roughly R-6 to R-7 per inch is what makes that assembly work in the depth available.
The mechanical side of the complaint
Even insulated correctly, a bonus room is often served by one long undersized duct run at the end of the branch. If the room is still behind after the envelope work, that is a balancing and ductwork question rather than an insulation one, and we will say so rather than sell more foam.
Who quotes it and who sprays it
Bonus room spray foam insulation Devon is quoted, scheduled and sprayed by us. Our own installers are on the job, and the number you are given is the number we stand behind.
Bonus Room Spray Foam Insulation Devon: Common Questions
Why is the floor cold when the room is warm? Because there is a garage under it, and the insulation in that floor has usually sagged away from the subfloor. The air gap does the rest.
Is the garage ceiling or the room ceiling the priority? The garage ceiling, nearly always. It is the surface with the biggest temperature difference across it and the one most likely to have failed.
What about the overhang at the front? It gets sealed where the joist bays cross the wall line. Cold air enters there and runs back under the floor, and almost nobody addresses it.
How much does bonus room spray foam insulation cost in Devon? Priced per board foot, so the floor area over the garage plus any sloped ceiling sets the quantity. Access from inside the garage is usually straightforward, which keeps the labour side predictable.
How do I choose a bonus room contractor in Devon? Ask whether they are quoting the garage ceiling, the cantilever and the sloped ceiling as three separate items. If the quote names only one of the three, it will not fix the room.
Size the assembly with the R-value calculator, then get a free Devon quote. More on Bonus Room Spray Foam Insulation Alberta.