James Hardie Siding Installation Process
What happens from the first visit to the final walkthrough, and the details that decide how well the siding performs.
Every house is different, so treat this as the usual sequence, not a fixed script. Your installer will adjust it to your walls, the season and what’s found under the old siding.
1. Consultation and inspection
The walls are measured and the existing exterior is checked: siding condition, signs of moisture, trim, soffit and fascia, and how windows and doors are flashed. This is also when you talk about what you want the house to look like.
2. Design and material selection
You choose products (lap, vertical panel, shingle), textures, trim style and colours. Samples help a lot here. Colours look different in Calgary’s strong sun than on a screen.
3. Exterior preparation
Old siding comes off and is disposed of. The sheathing underneath is inspected, and any soft or damaged areas are repaired before anything new goes on.
4. Weather barrier and flashing
This is the part you’ll never see again, and it matters most. A weather-resistive barrier goes over the sheathing, and windows, doors, roof-wall intersections and penetrations are flashed so water that gets behind the siding drains out.
5. Siding and trim installation
Boards and trim are cut, fastened and spaced according to James Hardie’s installation instructions for the product. The manufacturer publishes specific requirements for fastening, joints and clearances above roofs, decks, steps and grade. Following them protects both performance and warranty.
6. Finishing and quality inspection
Joints are caulked where required, cut edges and nicks are touched up, the site is cleaned, and you walk the job with the installer.
Details worth asking about
| Detail | Why it matters |
|---|---|
| Clearances | Keeping siding off roofs, decks and soil stops the bottom edge sitting in water and snow. |
| Flashing | Directs water out at windows, doors and where roofs meet walls. |
| Fastening | Correct fasteners and placement keep boards secure in wind. |
| Cut edges | Field-cut edges need to be sealed as the manufacturer directs. |
| Dust control | Cutting fibre cement creates silica dust. Crews should use proper cutting methods and protection. |
How long does it take?
It depends on the size of the home, the complexity of the walls, weather and what turns up after tear-off. Your written quote should include an expected schedule.
Winter installation
ColorPlus boards arrive finished, so painting isn’t weather-dependent. Cold, snow and short days can still slow a job, and some sealants have temperature limits. A local installer will plan around that.