A reasonable-sounding suggestion comes up often: do half the building now and the rest next year. Quonset spray foam insulation in Sherwood Park is one of the jobs where that instinct works against you, and it is worth explaining why before a budget gets split rather than after.
A partial envelope leaves a seam that does the damage
Where the treated section meets the untreated section, there is a boundary between warm insulated shell and bare cold steel. Warm moist air reaches that boundary, finds the first cold surface it has met, and condenses there in a concentrated line. The result is often a building that drips worse along one line than the whole thing did before, and owners reasonably conclude the work made it worse. It did not make the building worse; it moved all of the problem to one place.
Half a shell does not give you half the benefit
Air moves. A sealed half joined to an unsealed half is not a sealed building, and the untreated end goes on driving air through the whole structure. The heating improvement people expect from doing half simply is not there, which makes the staged version poor value as well as a condensation risk.
Where staging genuinely does work
By building, not by section. On a yard with more than one structure, doing one whole building this year and another next year is sensible and it is what we would recommend. The rule is that whatever gets done gets finished, because an envelope only behaves like an envelope when it is continuous.
If the budget only stretches partway
Then the honest advice is to reduce the thickness rather than the coverage. Full coverage at a modest thickness outperforms a thick coat over part of the shell, because the areas left bare are where the cold surface survives and the water then concentrates. That is a real option and it is a better one than half a building.
Why the arch needs foam at all
There are no stud bays and no flat planes on a quonset. Batt has nothing to sit in and rigid board cannot follow the curve without leaving voids behind it, and a void against cold steel is where condensation forms out of sight. Foam bonds to the shell and takes its shape, so it is the insulation and the air barrier in a single pass. It needs clean, dry steel with any active rust dealt with rather than sealed under it.
Quonset Spray Foam Insulation Sherwood Park: Common Questions
Can we do half the building this year? We would advise against it. The join between treated and untreated shell becomes a concentrated condensation line, and a Sherwood Park yard with two buildings is better served finishing one of them, and the heating benefit of half a sealed building is not half.
What if the budget will not cover the whole shell? Reduce the thickness, not the coverage. Full coverage at a modest thickness beats a thick coat with parts left bare.
Is staging ever sensible? By whole building, yes. One structure finished this year and another next year is a good plan; half of one is not.
Estimate the thickness with the R-value calculator, then get a free Sherwood Park quote. More on Quonset Spray Foam Insulation Alberta province-wide.