Spray foam insulation cost in St. Paul is driven by one local fact more than any other: about 73% of the housing here was built before 1991, and the farm and commercial buildings are older still. On a building that has been worked on several times, the cost is not just the foam. It is the foam plus whatever has to be dealt with before the foam can go on, and the quotes that surprise people are the ones that priced the first part and discovered the second part later.
How the number is actually built
Foam is priced per board foot, which means one square foot sprayed one inch thick. So the figure follows two things: the area being sprayed and the thickness that area needs. Thickness comes from the target R-value and from the job the layer has to do; closed-cell gives roughly R-6 to R-7 per inch and becomes a vapour barrier at about two inches, so an assembly that needs vapour control has a minimum thickness regardless of its R-value target. Open-cell, at roughly R-3.5 to R-3.8 per inch, fills a cavity to its depth and is used where sound and interior applications are the point. Area times thickness is the material and the spray labour. Everything else on a quote is preparation, access or finishing.
The preparation items that move the number here
On older buildings in this district, four things recur. Removing an existing assembly, because batt with a poly or foil facing cannot be sprayed over without creating a moisture trap. Cutting access, because the bay, the crawl space or the knee wall void is closed in. Clearing the work area, which on a farm building means moving equipment and on a basement means emptying the perimeter. And repairing what the inspection found, which is usually a drainage or water issue that has to be solved first because foam is not waterproofing. None of those are padding. They are the reason two quotes on the same square footage can differ honestly.
Finishing, and when it is not optional
Where foam is left exposed in an occupied space, a thermal barrier over it is a code requirement. In a shop, a garage or a basement that is being used, that finish is part of the job and should be a line on the quote rather than an upgrade mentioned afterward. In a washdown environment like a bird barn or a food area, the required coating is heavier again. A quote that omits the finish is not cheaper; it is incomplete.
Where the money gives the most back on this stock
The rim joist, first, nearly always: a small quantity of material on the leakiest accessible part of an older house. Then sealing the ceiling plane, as distinct from adding depth to it. Then the specific junctions that an extended building creates, such as the old exterior wall now standing inside an attic. Bulk depth in an open attic is the cheapest R-value available and it should be bought as blown-in material rather than as foam, and a contractor who tells you so is saving you money in the place it is easiest to overspend.
What to ask for so two quotes can be compared
An itemised scope by assembly, with the thickness stated for each one. The existing material named and a separate line for removing it. Access and preparation listed rather than assumed. The finish over the foam included where it is required. And what is deliberately being left alone, with the reason. Two quotes written that way can be compared directly. Two single-figure quotes cannot be compared at all, and on a building with sixty years of history the single figure is the one most likely to move.
Who quotes it and who sprays it
You are dealing with the contractor directly on spray foam insulation cost St. Paul. We quote the job, we schedule it, and our own installers do the work.
Spray Foam Insulation Cost St. Paul: Common Questions
How is spray foam priced? Per board foot, meaning one square foot at one inch thick. Area and required thickness therefore set the material and spray labour, and preparation and finishing are priced on top.
Why is one quote so much higher than another? Usually because one includes removing an existing assembly, cutting access or the required finish over the foam, and the other left those out and will find them later.
Is foam always the cheapest way to add R-value? No, and in an open attic it is not. Depth there is cheaper as blown-in material over a properly sealed ceiling plane.
How much does spray foam insulation cost in St. Paul? It is quoted per building after a look at what is in the assemblies, because the preparation on older stock varies far more than the foam does. Expect the quote to list area and thickness per assembly rather than a single figure.
How do I get a spray foam insulation quote in St. Paul? Tell us the building, which rooms or bays are the problem, and what you already know has been done to it. Then we look, measure each assembly and quote them separately.
Size the job with the R-value calculator, then get a free St. Paul quote. More on Spray Foam Insulation Cost Alberta province-wide.