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Those drafts force your furnace to run longer just to maintain a steady temperature. Exterior insulation stops that by sealing the building envelope from the outside. It’s a direct fix that pays off every time the wind picks up.
This upgrade also defends against the rain that soaks the coast for months. By adding a continuous layer to your exterior walls, it keeps moisture out of the structure before rot or mold can start. For homes here, that peace of mind is as valuable as the energy savings.
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| Exterior Insulation Dunbar-Southlands Insulation Material Type | R-40 Tier Prices | R-20 Continuous Tier Prices | R-30 High Performance Tier Prices |
|---|---|---|---|
| Whole-Home Exterior Insulation | CAD 18,000 – CAD 34,000 | CAD 12,000 – CAD 22,000 | CAD 15,000 – CAD 28,000 |
| Spray Foam Insulation | CAD 4,500 – CAD 9,800 | CAD 2,200 – CAD 4,800 | CAD 3,200 – CAD 7,000 |
| Rigid Foam Board | CAD 3,800 – CAD 7,900 | CAD 2,000 – CAD 4,200 | CAD 2,800 – CAD 5,800 |
| Blown-In Cellulose Insulation | CAD 1,200 – CAD 2,600 | CAD 650 – CAD 1,400 | CAD 900 – CAD 1,900 |
| Fiberglass Batt Insulation | CAD 4,200 – CAD 8,900 | CAD 2,200 – CAD 4,800 | CAD 3,100 – CAD 6,500 |
Thermal Protection Benefits
Drafts and cold walls make your home uncomfortable and force your heating system to work harder. Adding a continuous layer of rigid Exterior Insulation to your home’s outside walls stops heat loss right where it starts, keeping indoor temperatures steady. This method makes your building envelope act like a thermal shield.
Putting insulation on the outside of the framing removes thermal bridges where studs let cold in. You get a tighter envelope, lower energy bills, and less outdoor noise. It’s a long-lasting solution that improves comfort all year.
Dunbar-Southlands has tree-lined streets and homes built from the 1920s to the 1960s. Many of these houses have little to no insulation in their outside walls, letting damp coastal air chill the rooms.
Our wet winters and sudden cold snaps make that missing thermal layer a big problem. Adding exterior insulation to your Dunbar home stops moisture-driven heat loss and protects original siding from weather damage, all without affecting your interior.
Rigid Board Installation Techniques
For homes in Dunbar-Southlands, we use rigid foam boards like EPS, XPS, or polyiso. These boards go directly over the existing sheathing. We fasten them with long screws through furring strips into the studs. This creates a thermal break outside the framing. This method keeps the interior untouched while wrapping the house in a continuous layer of insulation.
Choosing the right material is important in our damp climate. XPS and polyiso offer a higher R-value per inch and better moisture resistance than EPS, which can absorb water over time. For older homes in Dunbar, we often recommend mineral wool boards. They are vapor-permeable, allowing the wall to dry outward while still providing good thermal resistance.
The order of installation is critical. After adding the insulation layer, we create a rainscreen gap behind the new siding using vertical strapping. This gap helps moisture drain and air circulate, protecting both the new insulation and the original wall sheathing from Vancouver’s long wet season.
The key principle is outward drying potential. Older homes in Dunbar-Southlands were built without a vapor barrier, relying on leaky walls to dry. Adding exterior insulation changes the wall’s temperature profile. It moves the dew point outward and away from the sheathing, which helps prevent condensation inside the wall during cold snaps.
Proper flashing integration is essential in our rainy region. The insulation layer must include head flashings over windows and doors and base flashings at the bottom of the wall to direct water out over the siding. This layered approach ensures water sheds at every horizontal transition, protecting the structural framing from rot.
Fastening patterns must consider the added weight of the insulation and cladding, plus wind forces common to coastal Vancouver. Long fasteners transfer the load back to the studs, creating a strong assembly that resists both gravity and uplift. This keeps the entire exterior secure against winter storms from the Strait of Georgia.
Dunbar-Southlands insulation bylaws
The Vancouver Building By-law 2019 (Division B, Section 9.25 – Heat Transfer, Air Leakage and Insulation) requires that any exterior wall, ceiling, or floor separating heated space from the outside air or soil must have enough thermal insulation. This insulation helps prevent winter-side condensation and keeps occupants comfortable. Loose-fill insulation is allowed in wood-frame walls of existing buildings, so any upgrades to exterior insulation must meet these thermal and moisture-control requirements when retrofitting walls on homes. Additionally, the Vancouver Building By-law 2019 (Division B, Section 11.3 – Alternative Compliance Measures for Existing Buildings) mandates that when adding exterior insulation to existing combustible exterior walls, the wall’s fire-resistance rating must be kept. Voids in the wall assembly must be filled with noncombustible insulation and properly fire-stopped if combustible construction is kept, ensuring that energy retrofit work does not lower fire protection performance. Lastly, the Noise Control By-law No. 6555 (City of Vancouver) sets construction-noise limits for exterior insulation work: on or near residential properties, construction noise is allowed only from 7:30 a.m. to 8:00 p.m. on weekdays and from 10:00 a.m. to 8:00 p.m. on Saturdays. No construction-related noise is allowed on Sundays or holidays unless a noise by-law exception permit is obtained.
