Vapour Barrier Installation Heritage Valley Town Centre Area Edmonton

Poly and air sealing in Heritage Valley Town Centre Area before the board goes on

Alberta winters put a large vapour drive from inside to outside, so the barrier belongs on the warm side of the insulation. Getting the position right matters as much as getting it sealed: a second barrier on the cold side traps moisture in the assembly with no way to dry.

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

Vapour Barrier Installation Heritage Valley Town Centre Area Edmonton

Renovations, and meeting an existing barrier

Heritage Valley Town Centre Area drywall in context

Poly against smart membranes

Sealing at the electrical boxes

Never two barriers

Inspecting it before it is covered

Top plates, bottom plates and the perimeter

Simple, clean, on schedule — Vapour Barrier Installation in Heritage Valley Town Centre Area Edmonton

Vapour Barrier Installation Heritage Valley Town Centre Area Edmonton: your questions answered

Is poly always the right answer?

No. Some assemblies, such as insulated concrete basements or walls with exterior rigid insulation, are designed to dry inward, and poly stops that. We look at the whole assembly rather than defaulting.

Is the vapour barrier the same as an air barrier?

Not by itself. Poly slows vapour diffusion; sealed properly it also slows air, and unsealed it does very little of either. The sealing is what turns a sheet of plastic into a working assembly.

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.

Does it matter where the sheet meets the ceiling and floor?

It is the whole job. Left loose at the top or bottom plate, warm air simply goes over or under a perfectly installed sheet. The junction into a vaulted ceiling is the most commonly skipped and the wettest point in the room.

Why is there staining around my window reveals?

Usually the vapour barrier return at the window was torn or tucked rather than sealed. It is a cold junction, so condensation shows there first — often as staining or mould at the reveal.

What if there is already a vapour barrier in the wall?

We tie into it, and we check whether there is a second one somewhere that would trap moisture between the two. Older Heritage Valley Town Centre Area renovations quite often have both, and finding that before boarding is worth the hour.