Hillside neighbourhoods like Promontory sit higher and more exposed, where wind and the occasional heavier snowfall make load, fastening, and ice-dam detailing matter. Across the agricultural land in Yarrow and Greendale, farm buildings and acreage homes frequently run metal roofing chosen to handle open-field wind. Even at the dry end of the valley, the region still gets serious rain, so rainscreen drainage cavities and solid flashing stay essential on new builds and re-clads alike.
A century of housing stock under one valley
Chilliwack’s homes span more than a hundred years of building habits, and that history shows up on every roofline. The downtown core around Five Corners still holds early-1900s houses and tidy post-war bungalows, most now on their second or third roof with cladding that has been patched more than replaced. Many of those original core houses also carry add-ons and enclosed porches tacked on through the 1970s, and the roof-to-wall transitions there are exactly where leaks tend to start. From the 1960s to the 1990s, subdivisions filled in around Little Mountain and Fairfield Island with wide-eaved bungalows and split-levels. The 2000s redevelopment of the former CFB Chilliwack lands into Garrison Crossing added a dense run of craftsman-styled homes leaning on fibre cement and board-and-batten trim, while newer construction keeps climbing Chilliwack Mountain and the eastern slopes.
Temperature swings and why ventilation matters
Sitting at the dry, inland end of the valley, Chilliwack swings harder between summer heat and winter cold than anywhere on the coast. Those extremes drive asphalt and metal through wider expansion-and-contraction cycles, and they bake attics through the heat-dome summers the Fraser Valley now sees regularly. Balanced intake-and-exhaust roof ventilation does more here than most owners expect: it slows shingle ageing, eases summer attic heat, and helps keep winter deck temperatures even. Asphalt shingles stay the practical default for the bulk of Chilliwack homes, and on more exposed lots up the hillsides a standing-seam metal roof earns its cost through that same temperature cycling and the wind coming off the mountains. When an older core roof finally gives up, it usually shows itself as a ceiling stain after a wind-driven downpour rather than a clean tear-off decision, so quick leak diagnosis matters as much as the eventual re-roof.
Cladding, water, and the wildland edge
Fibre cement has become the go-to re-clad around Garrison Crossing and the newer subdivisions for good reason — it shrugs off the valley’s humidity swings and offers real fire resistance for homes sitting close to the wildland edge along the mountains. Fibre cement siding suits that mix far better than the aging stucco and painted wood still found on many downtown-core houses, which tend to need targeted repair before water works its way in behind them. And whatever covers the walls, the sheer volume of rain still rolling off Fraser Valley roofs means correctly sized gutters and downspouts are no afterthought — undersized runs overflow against fascia and foundations through every heavy autumn system. Getting drainage, flashing, and material choice right for each neighbourhood is the work that keeps these homes dry.