A bare quonset in Medicine Hat spends most of the year as a solar collector with a condensation problem. The arch presents a huge curved area of uninterrupted steel to the sun, and in the sunniest city in Canada that shell heats fast, then gives it all back the moment the sun drops. Water appears on the inside of the roof in a climate people describe as dry. Quonset spray foam insulation in Medicine Hat has to stop that solar gain as well as the winter loss.
Why the arch is the hardest shape to insulate any other way
There are no stud bays and no flat planes. A quonset is a single continuous curve, which means batt has nothing to sit in and rigid board has nothing to sit flat against. Anything mechanically fastened to the curve leaves gaps behind it, and gaps behind insulation on a cold steel shell are where the water goes. Spray foam is used on these buildings because it takes the shape of the arch and bonds to it, so there is no cavity to condense in.
The southeast heat load is a real design input
Peak solar gain on curved steel here is significant enough that summer becomes its own problem, not just an afterthought to winter. An uninsulated quonset used for equipment, chemical or produce storage will run far above outdoor temperature through the afternoon. Closed-cell foam on the inside face cuts that swing from both directions - it slows the heat coming in and it keeps the interior surface above the dew point when the temperature falls off at night.
What actually stops the dripping
The mechanism matters, because people spend money on the wrong half of it. Dripping stops when the interior surface is no longer colder than the dew point of the air touching it. Adding a ventilation fan to a bare steel arch moves air but leaves the cold surface in place. Foam applied direct to the shell removes the cold surface itself, which is why it solves the problem rather than managing it.
Why closed cell suits an arch
- Closed-cell is the standard choice on an arch: it is structural enough to hold on the curve and it does not absorb water.
- Existing rust should be dealt with before foam goes on, not sealed under it.
- Any interior finish over the foam still needs the thermal barrier the building code requires for the occupancy.
Who you are dealing with
Nobody gets handed your Quonset spray foam insulation Medicine Hat job. We quote the job, schedule it and stand behind it, and our crews are the ones who show up.
Quonset Spray Foam Insulation Medicine Hat: Common Questions
Why does a bare quonset get so hot? It behaves like a solar collector - a curved steel shell in one of the sunniest places in Canada. Foam on the inside slows that as well as the winter loss.
Is condensation still a problem in a dry climate? Whenever the building is heated, yes. The moisture comes from inside, and it condenses on the panel regardless of the outdoor humidity.
Does the arch need a thermal barrier? If the space is occupied, foam needs a covering. A storage building entered only for service is treated differently.
How much does Quonset spray foam insulation cost in Medicine Hat? An arch is the hardest shape to insulate any other way, which is why foam is the material rather than the preference, and the curve is what the pricing follows. The southeast heat load is a real design input here, so the specification answers summer as well as winter.
Best Quonset spray foam insulation contractor in Medicine Hat? Ask what they will do about the heat load, not only the condensation. On an arch in this part of the province the summer side of the problem is the one that gets forgotten.
Estimate the thickness with the R-value calculator, then get a free Medicine Hat quote. See quonset insulation province-wide or agricultural spray foam in Medicine Hat.