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Paragon
Water behind a partially framed addition here can linger, causing damage before the exterior closes up. Protect your investment with a weather-tight solution that ensures your new space stays dry from day one.
Consider how an addition can enhance your outdoor living. Expanding your home can create a seamless transition to your yard, providing more room for entertaining or relaxing while boosting curb appeal.
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| Home Additions Thornhill Addition Type | Standard Finish Price | Basic Finish Price | Upgraded Finish Price | Premium Finish Price |
|---|---|---|---|---|
| Second Floor Addition | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 400 – CAD 600 |
| Rear Extension | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 400 – CAD 600 |
| Side Extension | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 400 – CAD 600 |
| Garage Conversion | CAD 250 – CAD 400 | CAD 250 – CAD 400 | CAD 250 – CAD 400 | CAD 250 – CAD 400 |
| Rear Addition | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 350 – CAD 550 | CAD 400 – CAD 600 |
Weatherproof Home Additions
Adding living space to your home shouldn’t mean dealing with a tarp-covered site for months. When you plan a home addition in Vancouver, the biggest risk is moisture getting in before the new space is sealed. A single rainstorm can warp framing and cause mould to grow behind walls.
That’s why Paragon Exteriors builds the outside first. We wrap the new addition in a weather-resistant barrier while we work inside. Your new room stays dry from day one, and the finished space is fully insulated and fits well with your home’s existing structure.
In Thornhill, where the rainy season lasts from October to April, a home addition can quickly become a soggy mess if the crew isn’t ready. Wet weather requires a construction process that keeps the job site covered and the framing dry during the build.
Many older homes in the area have wood siding and single-pane windows that don’t handle moisture well. By connecting the new addition’s weather barrier to the existing exterior, we stop leaks at the seam and make sure the whole structure works together.
Exterior Assembly Techniques
We frame the addition and quickly cover the walls with plywood or oriented strand board that can handle high humidity, common in Thornhill. A full-height, non-perforated housewrap is attached over the sheathing, with horizontal seams overlapping like shingles to direct rainwater outward. This weather-resistant barrier stays behind the final cladding, creating a drainage plane that protects the framing from the constant moisture in the Fraser Valley.
We flash the window and door openings with flexible, self-adhered membrane before installing any units. Pan flashing at each sill guides any water back to the outside of the weather barrier. In Thornhill, where wind-driven rain is common, this step makes sure that the most vulnerable parts of the addition are sealed against moisture before we start interior work.
For the tie-in, peel-and-stick underlayment is applied up the existing wall and onto the new roof deck, then step-flashing is integrated into the original siding. This creates a shingled junction that stops water from pooling at the seam where the new structure meets the old, which is crucial on the sloped lots typical of Thornhill.
The connection between the existing home and the new addition is the weakest point in the building envelope, especially in a climate where outside surfaces can stay wet for weeks. We connect the new wall’s drainage plane with the old by cutting back the original siding and overlapping the new weather barrier behind the existing housewrap. This creates a clear path for any water to drain down and exit at the bottom of the wall.
We keep a continuous air barrier across the transition to stop warm, moist air from reaching the cold sheathing in winter. This lowers the risk of condensation forming inside the wall cavity, which is a common issue in the coastal climate of Thornhill. The exterior insulation layer also extends across the seam to reduce thermal bridging that can cause cold spots prone to condensation.
At the foundation level, we install a capillary break between the new concrete stem wall and the sill plate and apply a self-adhered damp-proofing membrane to the below-grade part of the foundation wall. These steps prevent ground moisture from moving up into the wood framing, which is essential due to the high water table and heavy seasonal rain in the area.
Thornhill Addition Permit Requirements
For a home addition in Thornhill, you need a residential building permit from the City of Maple Ridge. Homeowners must check that the addition meets the Zoning Bylaw rules about setbacks, height limits, lot coverage, and any environmental or development permit area conditions before applying for a building permit with detailed plans through the city’s permit process.
Home additions to single-family homes must follow the Maple Ridge Zoning Bylaw. This includes rules about height, siting, and lot coverage limits for the specific zone. The City’s Single Family/Accessory Addition Guide explains these zoning rules, which must be followed before a permit is issued.
For properties near the Fraser River escarpment or steep slopes, there may be extra requirements. Drainage from additions must connect to the city storm system, and a geotechnical engineer’s report and a Section 219 covenant on title may be needed before a permit is issued. A limited exemption allows a one-time, single-storey slab-on-grade addition up to 460 sq. ft. if a geotechnical report about stability and retrogression is accepted by the Chief Building Official.
