Roof Insulation Services in the Lower Mainland, BC
Roof insulation is insulation installed in the roof itself – in vaulted and cathedral ceilings, flat roofs and unvented roof assemblies – rather than on an attic floor. Western Insulation insulates roofs across Langley, Metro Vancouver and the Fraser Valley with closed-cell spray foam, rigid foam and batts, with the ventilation and thermal barrier BC code requires.
When You Need Roof Insulation (Not Attic Insulation
If your home has an open attic, the cheapest fix is usually attic insulation on the attic floor. Roof insulation is for spaces with no attic: vaulted and cathedral ceilings, bonus rooms under the roof, flat roofs and homes being converted to an unvented (‘hot’) roof.
Vaulted and cathedral ceilings
Flat and low-slope roofs
Rooms in the roof (bonus rooms, lofts)
What Roof Insulation Fixes
Hot, cold rooms under the roof
Vaulted rooms and lofts often have too little insulation for their shallow rafters.
Condensation in the roof
Air-sealed insulation stops warm, damp air reaching the cold roof deck – see attic condensation in winter.
Ice dams
Less heat escaping through the roof means less snow melting at the eaves.
Summer heat
Better roof insulation keeps upper floors cooler in heat waves.
Roof Insulation Options
Insulation Options
Closed-cell spray foam (unvented roofs)
Sprayed to the underside of the roof deck to insulate and air-seal shallow rafters. Must be covered with a thermal barrier – see our spray foam thermal barrier guide.
Rigid foam above or below the deck
Rigid foam board for flat roofs and re-roofing projects, installed with your roofer.
Batts with vent baffles
For vented cathedral ceilings with enough rafter depth, with baffles to keep an air gap under the deck.
Hybrid flash-and-batt
A layer of spray foam for air sealing plus batts to reach the target R-value at lower cost.
Why Homeowners Choose Western Insulation for Roof Insulation
Established 1998 and based in Langley Township – local crews who know Lower Mainland homes
In-house installation crews
Rebate-ready invoices showing area, R-value before and after, and insulation type
Workmanship warranty
Before-and-after photos of the finished work
What Our Customers Say
Roof Insulation Rebates (HPCN Contractor Required)
Current BC Rebates Include
Attics and flat or cathedral ceilings: $0.02 × R-value added × sq ft, minimum R-12 added, up to $900 (replaces 'Up to $1,200')
Other areas: $0.07 × R × sq ft, minimum R-20 added, up to $1,000
Bonus up to $2,000 for more than one upgrade
Details on our rebates page.
Related Services
Roof projects often go hand in hand with attic insulation, rigid foam insulation and spray foam insulation, depending on your roof style and attic space.
Roof Insulation Across Langley, Metro Vancouver and the Fraser Valley
Our crews are based in Langley Township and do most roof insulation work in Langley, Surrey, White Rock, Aldergrove, Abbotsford and Maple Ridge, with regular projects across the rest of Metro Vancouver and the Fraser Valley.
Reviews and Accreditation
Book a Roof Insulation Assessment
We’ll check how your roof is built, whether it’s vented, and how much depth you have, then recommend the right system.
Frequently Asked Questions
What is the difference between roof insulation and attic insulation?
Attic insulation sits on the attic floor above your ceiling, with a ventilated attic above it. Roof insulation is installed in the roof itself, between or above the rafters, and is used where there is no attic: vaulted and cathedral ceilings, flat roofs, lofts and unvented roof assemblies. Attic insulation is usually cheaper when you have an attic.
Can you insulate a cathedral or vaulted ceiling?
Yes. If the rafters are deep enough, we use batts with vent baffles to keep an air gap under the roof deck. If they are shallow, closed-cell spray foam or rigid foam gives more R-value per inch and air-seals at the same time. Spray foam must then be covered with an approved thermal barrier such as drywall.
What R-value should a cathedral ceiling have?
Aim for about R-28 to R-40 in cathedral ceilings, depending on rafter depth and the material used; new construction must meet the BC Building Code and your municipality’s Step Code level. Attics with room for loose fill should reach about R-50. We recommend a target after seeing your roof construction.
Does roof insulation qualify for BC rebates?
Yes, when an HPCN contractor installs it. BC Hydro and FortisBC treat flat and cathedral ceilings like attics: $0.02 × R-value added × square feet, with at least R-12 added, up to $900. Other eligible areas earn $0.07 × R × sq ft, with at least R-20 added, up to $1,000.
How long does roof insulation take?
Most vaulted-ceiling or roof-deck insulation jobs take one to two days. Spray foam needs a curing and ventilation period before the thermal barrier goes on, and flat-roof work is scheduled with your roofer, so total project time depends on the other trades involved.
