Fibre Cement and James Hardie Siding St. Thomas

Specifying for St. Thomas conditions

What suits a wall in St. Thomas:

• Insulated vinyl on the uneven older frame walls near the core, where the contoured backing hides wall irregularity.
• Fibre cement on the exposed south and southwest elevations that take the driven rain.

St. Thomas sits roughly 15 km inland from Lake Erie on the Elgin plateau. The practical effect is south and southwest driven rain: the lake-side elevation of a house here takes more wind-driven water than the equivalent wall in London, and that is where seam and J-channel detailing matters most.

How fibre cement and james hardie siding is done properly

• Ground clearance and roof-to-wall clearance are specified minimums. This is the detail most often missed on Ontario installs.
• Cutting generates crystalline silica dust. Score-and-snap or a dust-collecting shear is the correct method, not a dry circular saw in the driveway.

Where fibre cement and james hardie siding goes wrong

• Boards run tight to a deck or roof line with no clearance, wicking water into the core.

Where the water has to go in St. Thomas

St. Thomas handles this through Property Standards rather than a drainage by-law: no storm water run-off from a downspout or any surface may be drained onto neighbouring property, and the owner is required to grade and maintain the lot so water does not pond or find its way into a basement.

The City has pushed householders to disconnect downspouts that run into the ground and cap the buried pipe, as part of its basement flooding work. Its published guidance is to get the water 1.8 metres away from the foundation — a recommendation rather than a bylaw minimum, and more than twice the distance London writes into WM-4.

On the tight nineteenth-century lots near the old Canada Southern corridor, 1.8 metres of downspout extension can be most of the way to the property line, and the Property Standards rule about a neighbour's land starts to matter at the same moment. Those two constraints are usually solved together or not at all.

What drives the price in St. Thomas

Fibre cement carries a meaningfully higher labour cost than vinyl — heavier boards, dust control, and per-board fastening rather than hung courses.

St. Thomas is 30 km from the London base. About 30 minutes south of London down Highbury Avenue or Wellington Road. Travel affects scheduling, not the price, and either way it is stated before you book.