System 04
The waterproofing backbone behind every finish. Get the barrier and flashing right and the wall stays dry, air-tight and durable — for the life of the building.
The backbone
A weather-resistive barrier (WRB) or air/vapour barrier over the sheathing prevents moisture infiltration and delivers air-tightness — the single biggest factor in envelope durability and energy performance. We install self-adhered and liquid-applied membranes and integrate precision-engineered flashing to safeguard the structure against the elements.
See the full wall assembly →
Scope
The membranes, transitions and sealant that make a wall watertight.
Self-adhered or liquid-applied membranes for air-tightness and moisture control, applied to a clean, prepared substrate.
Windows, penetrations, corners and terminations tied in so the barrier is genuinely continuous.
Fabricated flashing at heads, sills, parapets and transitions — shaped to shed water away from the assembly.
Correctly specified, tooled and backed joints that stay flexible and watertight through thermal movement.
Why it matters
Continuous insulation and premium cladding only perform if air and water are controlled first. Gaps at transitions are where walls fail. We treat the barrier and flashing as the foundation of the whole assembly — not an afterthought.
See the full assembly →Reduces uncontrolled air leakage — and the energy loss and condensation risk that come with it.
Keeps bulk water and vapour out of the assembly, protecting insulation and structure.
Well-detailed transitions prevent the leaks that shorten a facade's service life.
Supports energy-code targets and a healthier, more comfortable interior.
Materials
Common questions
Air-tightness, transitions and the products we trust.
A WRB, or air/vapour barrier, is a membrane over the sheathing that prevents moisture infiltration and delivers air-tightness — the single biggest factor in envelope durability and energy performance. We install both self-adhered and liquid-applied systems.
Gaps at transitions — windows, penetrations, parapets, sills — are where walls leak. Precision flashing sheds water away from the assembly and ties the barrier together so it's genuinely continuous.
Yes. Reducing uncontrolled air leakage supports energy-code targets and a healthier interior. Continuous insulation and rainscreen cladding only perform if air and water are controlled first.
Proven systems including Henry Blueskin SA LT and VP160, Soprema and 3M Air Barrier 3015VP — specified to the wall assembly and performance targets.
Start your project
Send us the details and we'll scope the barrier, flashing and sealant work — usually within one business day.
Licensed & insured · WSIB · Serving Toronto & the GTA since 2012