Basement apartment spray foam insulation gives a second unit warm walls, a dry floor edge and a quieter ceiling. We install closed cell foam on the foundation and rim joists and open cell foam between the floors. Each job we do is fully insured.
In March 2025, Belleville changed its zoning to allow up to four homes on most serviced lots in town. That can be a main house plus up to three extra units. Many owners are turning the basement into an apartment first, because the space is already there.
A tenant lives in the basement full time, so it has to stay warm, dry and quiet all year. A cold, musty basement that was fine for storage will not work for a bedroom. The foundation walls need to be insulated and kept dry behind the drywall, and the rim joists need to be sealed.
The building department will also look at fire separation between the units. Spray foam insulation does not replace the fire-rated drywall that goes on the ceiling, but it does sit behind it. We plan our work so your drywall crew can finish to the inspector's requirements.
Footsteps and voices carry through a basement ceiling. Open cell spray foam insulation in the floor joists absorbs a large part of that sound. It is the same reason we use open cell in interior walls between bedrooms and bathrooms.
Closed cell foam is not a good sound absorber. It is the right product on the cold outside walls and the wrong one for the ceiling. Using both in the right places is what makes a basement unit pleasant to live in.
Some owners add a unit over a detached garage or in a finished attic instead. The same rules apply. Closed cell foam goes against the cold surfaces, and open cell foam goes between the units. Our garage insulation page covers rooms over garages.
A typical Belleville basement unit needs closed cell on 600 to 1,200 square feet of wall plus open cell across the ceiling. Local market rates are roughly $1.75 to $3.50 a board foot for closed cell and $0.90 to $1.60 for open cell. We price it at no charge after a visit.
Call (613) 912-7508 before you frame the walls. It is much cheaper to insulate an open basement than to open finished walls later. Our basement insulation page explains the foundation work in more detail, and the home page shows everything else we install.
One visit can price the whole house on a single written quote.
Warm air escaping upward is the main cost of a leaky Belleville attic. Attic spray foam insulation closes those openings, either across the ceiling or up on the roof boards, depending on what the attic is used for. Each attic job is fully insured.
View Attic Insulation
A finished basement goes mouldy when warm room air touches cold concrete. Basement spray foam insulation sticks directly to the poured or block wall so that air never reaches it. Closed cell foam goes on the foundation, the rim joists and the slab edge, and each basement job is fully insured.
View Basement Insulation
Frozen pipes and icy floors usually trace back to the crawl space. Crawl space spray foam insulation goes on the foundation walls and rim joists, over a taped ground sheet, so the space holds close to house temperature. Insurance covers every crawl space we do.
View Crawl Space Insulation
Bedrooms over a garage are cold, and exhaust can drift in from below. Foam closes the shared wall, the ceiling and the outside walls of attached and detached garages alike. Garage work is fully insured.
View Garage Insulation
A Victorian house loses most of its heat through the attic, the knee walls, the basement and the band joist. Century home spray foam insulation goes after those four places first and leaves the old brick alone. Work on heritage homes is fully insured.
View Century Home Insulation
Cold concrete, crawl space walls and the floor over a garage all call for closed cell spray foam insulation. It packs roughly R-6 to R-7 into each inch, stops air outright and stops vapour once two inches are on. Closed cell jobs are fully insured.
View Closed Cell Spray Foam
Noise through a ceiling or a bathroom wall is the usual reason to choose open cell spray foam insulation. It is light and springy, rates about R-3.5 to R-3.8 an inch, stops drafts and soaks up sound. Open cell work is fully insured.
View Open Cell Spray Foam
A new Belleville house only has one chance to be sealed properly, and it is before the drywall. New construction spray foam insulation fills the stud bays, corners and pipe holes while everything is exposed. We fit the builder's calendar, and new-build work is fully insured.
View New Construction Insulation
Sunrooms, additions and closed-in porches are often the coldest rooms in a house, with three outside walls and a chilly floor. Home addition spray foam insulation brings the new room up to the comfort of the old one. Addition jobs are fully insured.
View Home Addition Insulation
New foam will not stick to failed foam, soggy batts or dusty old loose fill. Insulation removal strips the space back to clean wood or concrete first, then new spray foam insulation goes on. We cut, bag and haul it all away, and removal work is fully insured.
View Insulation Removal and ReplacementWe measure the space and send you a written price. The visit is free and you are under no obligation.
Fill in the fields below and we will call you to set up a visit. Prefer the phone? Reach us at (613) 912-7508.
