Drywall and Heritage Plaster Work in Niagara-on-the-Lake

Worth understanding properly if you own one of these houses, because it explains most of what goes wrong.

Plaster is applied wet over narrow wooden strips called lath. It is pushed on hard enough to squeeze through the gaps between the strips, and behind the lath that squeezed-out material spreads and hardens into small hooks. Those hooks are called keys.

The keys are the only thing holding the plaster to the building. Over a century and a half of movement, vibration and moisture, they break.

When enough of them fail, the plaster separates from the lath and is held up by nothing but itself. The surface can look completely intact while this is happening, which is why an apparently sound plaster ceiling can come down as a single heavy slab.

Signs worth acting on: a section that sounds hollow when tapped, visible sag, a crack that has widened recently, or fine dust appearing on furniture below.

Here is the part most contractors will not say. Replacing failing plaster with drywall is often cheaper and faster, and in a designated Old Town property it is frequently the wrong answer. Drywall does not carry the same surface character, it changes the wall plane and its relationship to original trim, and it removes original fabric permanently.

Sometimes replacement genuinely is the right call, and we will say so. But it should be a decision, not a default. See plaster repair.

A significant number of Old Town properties are designated under the Ontario Heritage Act, and much of the area around Queen, Johnson, Prideaux and Simcoe Streets sits within a heritage conservation district.

Where a property is designated, alterations affecting its heritage attributes may require municipal approval before work begins. Depending on how the designation is written, interior plaster can fall within scope.

Our approach is to work within those constraints rather than around them. Retain sound original material, match the surface character and profile of what is there, use compatible methods, and make sure any required approval is in hand before we start rather than after.

If you are unsure of your property's status, the municipal heritage planner can confirm it. That call is worth making before any contractor begins quoting.

The hospitality and agri-tourism sector here generates a steady stream of commercial interior work.

Tasting rooms and winery retail spaces across the Niagara River appellation. Inns and bed and breakfasts, many of them in converted heritage buildings where the commercial and the heritage considerations overlap. Restaurant and event spaces, plus the properties that fill up around the Shaw Festival season.

This work almost always has to happen outside the visitor season, between the end of the Shaw run and the spring, and it usually has a fixed date attached to it. We carry $2M liability and full WSIB coverage, and our crews hold WHMIS and Working at Heights certification. See commercial drywall installation.

Heritage and plaster work needs to be seen. Photographs help, and they cannot tell us whether a ceiling is still keyed or how much of a profile survives.

Tell us the age of the property, whether it is designated, and what you are seeing.