Siding selection is one of the most consequential decisions in Northern Idaho home construction and renovation. The Idaho Panhandle's climate -- heavy snowfall, freeze-thaw cycles, significant rainfall, and high UV in summer -- creates a demanding environment that exposes the weaknesses of every siding material. Here's the honest comparison.
James Hardie Fiber Cement
James Hardie is Vandenberg Construction's top recommendation for Northern Idaho exterior siding. Fiber cement is made from a mixture of cement, sand, and cellulose fiber. It doesn't absorb water, doesn't rot, doesn't provide food for insects, and doesn't experience the dramatic expansion and contraction with humidity changes that causes problems with wood siding.
Hardie siding comes factory primed and requires painting, but properly painted and maintained fiber cement siding should last 30 to 50 years in Northern Idaho's climate. The paint finish (Hardie's own ColorPlus finish) has a 15-year warranty against peeling and chipping.
The tradeoff: Hardie is heavier than wood or vinyl and requires specific installation techniques. Cutting creates silica dust that requires respiratory protection. Installation by a contractor who doesn't know the product leads to problems. Vandenberg installs Hardie correctly -- fastener schedule, joint flashing, and trim integration per Hardie's installation requirements.
LP SmartSide Engineered Wood
LP SmartSide is engineered wood siding -- wood fiber treated with a zinc borate borate treatment for rot and insect resistance, coated with an overlay, and factory primed. It's lighter and easier to cut than fiber cement, takes paint well, and has a very natural wood appearance.
LP SmartSide performs well in Northern Idaho's climate when properly installed and maintained. The key variables are paint maintenance (LP recommends repainting every 5 to 7 years in harsher climates) and maintaining the factory-applied primer/finish at all cut edges.
LP SmartSide costs slightly less than James Hardie and is a good choice where the natural wood look is important and the homeowner is willing to maintain the paint finish on schedule.
Traditional Wood Siding
Cedar and other wood sidings require the most maintenance but offer the most natural appearance and the best long-term repairability -- damaged boards can be replaced individually without matching issues.
In Northern Idaho, wood siding requires annual inspection, periodic spot repairs, and repainting on a 7 to 10 year cycle. Homes with traditional wood siding that have fallen behind on maintenance are among the most common exterior renovation projects we take on.
For new construction, wood siding is typically only specified when the architectural character of the project specifically calls for it.
Vinyl Siding
Vinyl siding is inexpensive and maintenance-free in mild climates. In Northern Idaho, it has two significant weaknesses: it becomes brittle in extreme cold and is more susceptible to impact damage (hail, ice, debris), and it has more thermal movement than other siding materials, which can cause fastener backing and panel gap issues over time.
For Northern Idaho homes that will be exposed to harsh conditions, we don't recommend vinyl as the primary siding choice.
Matching Existing Siding on Additions
One of the most common challenges in addition construction is matching existing siding. For Hardie and LP SmartSide, the product profiles are generally available in standard patterns. For vintage wood siding profiles, matching often requires sourcing custom millwork or selecting a complementary profile. Vandenberg discusses siding matching options with every addition client before framing begins.
For siding replacement or addition siding questions, call (208) 582-8733.