Siding for four seasons
Boise's semi-arid climate brings hot, dry summers, with a record high of 111°F, and cold winters with around 20 inches of snow in an average year, according to the National Weather Service. NOAA's engineering weather data for Boise records about 78 freeze-thaw cycles a year. Siding here has to handle intense summer sun, winter cold and the expansion and contraction between them.
Vinyl in Boise
Vinyl is affordable and low maintenance, but it expands in summer heat and becomes more brittle in winter cold. Installation must allow for movement, and panels can crack if struck in cold weather. Insulated vinyl is stiffer and more impact resistant.
Fiber cement and engineered wood
Fiber cement and engineered wood are more dimensionally stable. Both need cut edges handled according to the manufacturer's instructions and clearances from the ground, decks and roofs so snow and meltwater don't sit against the bottom edge.
Snow at the base of walls
Snow drifts and piles from shoveling can sit against siding for weeks. Keep the bottom edge at the manufacturer's required clearance above grade, avoid piling snow against walls, and make sure downspouts carry meltwater away.
Sun and finishes
Boise's summer sun fades paint and factory finishes on south- and west-facing walls. Quality finishes and lighter colors last longer. Inspect caulk annually.
Behind the siding
A new water-resistive barrier, properly flashed windows and doors, and kickout flashing where roofs meet walls protect the walls from winter moisture and summer storms.
Before you hire
Ask Boise siding contractors which product suits your exposure, how they'll handle expansion and clearances, whether they'll inspect sheathing, and what warranties cover. Look up the contractor's Idaho registration with DOPL.
Hail and summer storms
Summer thunderstorms in the Treasure Valley occasionally bring hail and strong winds. Vinyl can crack from hail, especially older vinyl that has become brittle. Fiber cement and engineered wood resist impact better. If your siding is damaged after a storm, photograph it and check with your insurer before repairs.
Wildfire considerations
Homes near Boise's foothills and open space sit close to grass and brush that can burn in summer. Noncombustible siding such as fiber cement, ember-resistant vents and a clear zone between plants and walls reduce risk. Check whether local codes require ignition-resistant materials at your address.
Maintenance
Wash siding gently with a hose and soft brush, inspect caulk every spring, touch up paint on primed products, and trim plants back so walls can dry. Check the bottom edge for damage after snowy winters.
Permits
Re-siding may need a permit from the City of Boise or Ada County, particularly when sheathing or structural repairs are involved. Ask the contractor whether it's included in the price.
Windows and doors
If windows are aging, replace them with the siding so the flashing can be integrated properly and the new siding isn't disturbed later.