Vapour Barrier Installation Rural North East South Sturgeon Edmonton

Vapour barrier in Rural North East South Sturgeon, sealed as a continuous plane

A vapour barrier only works as a continuous plane. In Rural North East South Sturgeon the failures are almost never the sheet itself — they are the electrical boxes, the top and bottom plates, the window returns and the penetrations, where the poly is cut and not resealed.

• Left ready for inspection before boarding
• Rim joists air-sealed before insulating
• Window and door returns detailed properly
• Poly on the warm side of the insulation
• Seams lapped at framing and sealed, not just taped
• Electrical boxes poly-hatted and sealed

Vapour Barrier Installation Rural North East South Sturgeon Edmonton

Why the warm side, and why only one

Rural North East South Sturgeon drywall in context

Where poly is the wrong choice

Where the barrier meets the ceiling and the floor

Inspection, and leaving it visible

Bathrooms, kitchens and the wet rooms

Sealing at the electrical boxes

Simple, clean, on schedule — Vapour Barrier Installation in Rural North East South Sturgeon Edmonton

Vapour Barrier Installation Rural North East South Sturgeon Edmonton: your questions answered

Can I add poly over insulation that already has a facing?

Usually no. Two retarders leave any moisture that gets in with no direction to dry. We check what is already in the wall before adding to it rather than assuming the cavity is bare.

Will this pass inspection?

It is built to what the code asks for on your permit, and we leave it visible and sequence to your inspection date rather than boarding ahead. If an inspector raises something, we want the note directly so it is fixed from the actual reason.

Is a basement wall done the same way as an upstairs wall?

No. A basement wall can take moisture from the ground too, so poly detailed like an above-grade wall can trap moisture against the concrete. The insulation is held off the concrete so the wall can dry, with vapour control on the warm side.

Can you install the barrier if someone else did the insulation?

Yes, but we check the insulation first. A barrier over a poorly filled cavity locks the problem in, and once the board is on neither can be corrected without opening the wall.

Is it a problem to have poly on both sides?

Yes. Two barriers trap moisture between them with no direction to dry. It is a real mistake we still find in renovated Rural North East South Sturgeon walls, and it stays invisible until the damage shows.

Does it matter where the sheets overlap?

Yes. A lap must land on solid framing and be sealed with acoustical sealant compressed between layers. An unsupported lap taped across a cavity flexes with pressure changes and works loose.