The complaint that brings us to a self storage site is never about temperature. It is about water. A tenant opens a unit after a few weeks away, finds the top of a stack damp or stained, and the operator is asked to explain a roof leak that is not there. Self storage spray foam insulation in Athabasca is nearly always about that: condensation forming on the underside of a steel roof and dripping onto the one thing in the unit that was stacked highest.
Why an unheated steel building rains on its contents
The roof sheet is thin steel with nothing behind it. On a clear night it radiates heat and drops below the temperature of the air in the building, and any moisture in that air condenses on it. The moisture comes from the ground under the slab, from snow and wet vehicles brought into the drive aisle, and from whatever the tenants stored, which in this part of the world includes a lot of things that were put away damp. The building does not need to be warm for this to happen. It only needs a cold surface and air with water in it, and an unheated steel roof supplies the first reliably.
Tempering, not heating
Operators are often told the answer is a heated building, which is an expensive conclusion. In most cases what is wanted is to keep the roof surface from being the coldest thing in the building and to stop the air moving in and out freely. Closed-cell foam sprayed in direct contact with the underside of the roof sheet does both: it removes the cold surface entirely, because there is no longer an air gap where moisture can reach cold steel, and it seals the building at the same time. Whether any heat is added afterwards becomes a separate, smaller decision.
Why anything hung below the steel does not solve it
A liner, a blanket or board fixed under the purlins leaves an air space between it and the sheet. Air gets into that space, reaches the cold steel, condenses, and now the water is above the insulation where nobody can see it until it comes through. It also wets the insulation, which stops it working. Contact with the steel is the thing that matters, and that is why foam is used on these roofs rather than something that can be cut and fitted.
Which units suffer and which do not
It is rarely the whole site. Interior units with neighbours on both sides stay closer to equilibrium. End units have an extra exposed wall. Units under a low section of roof or at the bottom of a slope where meltwater collects behave differently again. Walking the site and identifying the rows that actually have a problem usually produces a smaller and better-targeted scope than treating every building, and it lets the work be done in stages across seasons.
The slab and the drive aisle
Bare concrete on grade is a moisture source. If the slab was poured without a vapour break under it, water moves up through it continuously, and in a sealed building that water has to go somewhere. It is worth knowing whether that is the case before deciding how tight to make the building, because sealing a building with a wet slab in it and no ventilation moves the problem rather than solving it.
What to tell a tenant afterwards
This matters commercially. A tempered, sealed building is dramatically better than an unheated one and it is not a climate-controlled unit, and the difference should be described accurately in whatever the tenant signs. A modest, true claim survives a winter. An ambitious one generates the same complaint the work was meant to end.
Who quotes it and who sprays it
Self storage spray foam insulation Athabasca 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.
Self Storage Spray Foam Insulation Athabasca: Common Questions
Tenants say their boxes got wet but the roof is fine. What is it? Condensation on the underside of the roof steel. On a clear cold night the sheet goes below the air temperature and the moisture in the building collects on it.
Do we have to heat the building? Usually not. Removing the cold surface and sealing the building deals with most of it. Heat is a separate decision afterwards.
Why not fix a liner under the purlins? Because it leaves an air gap against the steel, which is exactly where the water forms. The insulation has to be in contact with the sheet.
How much does self storage spray foam insulation cost in Athabasca? It follows the roof and wall area treated and the thickness chosen, and it is often staged building by building. Treating only the rows that have the problem keeps the first phase small.
How do I choose a self storage spray foam contractor in Athabasca? Ask whether they intend to spray in contact with the steel and which rows they think need it. A site-wide quote with no walk-through has not looked at where the water actually appears.
Size the assembly with the R-value calculator, then get a free Athabasca quote. More on Self Storage Spray Foam Insulation Alberta province-wide.