Commercial and Industrial Flat Roofing in Kitchener, Waterloo and Cambridge

Why do converted brick industrial roofs behave badly?

Because the conversion changed the building physics and often not the roof. Raise the interior temperature and humidity, and moisture drives upward into an assembly that may have no vapour retarder at all, condensing on cold surfaces and wetting insulation. Thick masonry parapets that used to be uniformly cold now have a warm inner face, which changes where freezing happens within the wall. The Ontario Building Code lists climatic design data by municipality in Supplementary Standard SB-1, and Waterloo Region's inland position gives it colder winter design temperatures than the Toronto lakeshore, which sharpens all of this.

Then there is the geometry. These buildings rarely have one simple flat roof. They have multiple levels from successive additions, saw-tooth or monitor sections, original skylights and light wells, valleys between bays, and internal drainage running through the building. Every change of level and every skylight kerb is a detail that can fail, and there are a great many of them per square metre compared with a modern warehouse. Add masonry parapets whose copings and joints have taken a century of frost, and the roof edge becomes as much of a project as the field.

What we do differently on a conversion roof

We start with the interior environment, not the membrane. Before specifying anything on a converted Kitchener building we want to know what the space is used for, how it is heated and humidified, whether there is a vapour retarder in the existing assembly, and where the current cold surfaces are. Without that, a new membrane can make a condensation problem worse by sealing the assembly more tightly.

• Assembly design with a continuous vapour control layer and insulation sized for the interior conditions.
• Skylight, monitor and light well detailing that keeps daylight without keeping the leaks.
• Parapet and coping rebuilds coordinated with masonry restoration where the wall itself is failing.
• Multi-level tie-ins and valley detailing on buildings assembled from successive additions.
• Phasing around occupied tenancies, with access frequently limited to a narrow lane or a small yard.

For budget planning start with the flat roof cost calculator, but be aware that on a heritage conversion the detail count, not the area, drives the number. Our scope is described on the commercial roofing page.

Permits and heritage in Kitchener

The City of Kitchener publishes a plain list of what needs a permit. It states that installing new shingles on an existing roof does not require one, while removing a load-bearing wall, column, lintel or beam does, and notably that re-insulating walls, ceilings or floors does require a permit. That last item is directly relevant to conversion roof work, because upgrading a roof assembly's insulation is a normal part of correcting a converted building's performance. Check the City's when you need a building permit page and confirm your scope with Kitchener's building division, or with Waterloo or Cambridge if your building is there.

Many of downtown Kitchener's brick industrial buildings are also heritage-designated or sit within heritage districts, which can bring a separate approval for changes to visible exterior elements such as parapets, copings, chimneys and roof monitors. Establish the heritage status of the property before you design the roof edge, not after. You can start a conversation with us through the contact page.