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New Flat Roof Over Home Addition London Ontario

We’re at a home where the client has installed an addition at their home, and they have called Legacy Flat Roofing in to install a brand new flat roof over the new section.

We have to say that we may like new flat roof installations the best, especially when the company that framed the building did such a great job of making sure the building was square and level, it makes our lives so much simpler when people do quality work. We like to think that our high standard of work is what makes our clients lives so much simpler too!

Because the building is new, we start out with a brand new substrate to install our system on. There was a perimeter detail around the edges which was built at a 45 degree angle. This is fantastic for our team as we install a 2ply mod bit system and the 45 degree angle creates a much smoother transition for the membrane.

The roof has been built to shed water, with a slight angle the roof sends water to the front corder of the roof where there will be a new scupper (drain) to get the water off the roof. While we say that a new roof is an easier roof, we still want to make sure we do careful and precise work, as the client intends to install a composite deck on the roof once our part of the install is completed. So we want to make sure there will be no issues at all.

Once we are ready we install a waterproof membrane over the entire roof area, then we install our metal flashing around the perimeter of the roof. This ensures that water will not be able to escape into the roof, as once the metal is installed, we put our cap sheet on as the final layer, going up to the edge and over part of the metal flashing. Not only is it very powerful protection against water, ice and snow, it also looks fantastic from the ground level looking up.

The cap sheet is a peel and stick system, which is used in combination with an adhesive primer which is rolled onto the waterproof membrane. This allows it to properly stick onto the roof and remove any issues such as bubbles. We’ve inspected other roofs where the adhesive isn’t used, and often after a while you could use your foot to lift up the membrane, which if you can imagine the effects of a strong wind, isn’t good for a homeowner.

The final phase of the cap sheet installation is heat welding the seams. We activate the asphalt on the back of the cap sheet, and it creates a watertight seal as it binds to the other cap sheet.

It was a new roof but there were a few tricky details. There was a concrete slab step where the patio door is. To avoid any damage and yet at the same time not compromise on the flat roof’s effectiveness, we opted for a polyurethane coating along the underneath of the concrete step, which ends up driving into a dry rubberized compound and it will protect the section from leaks. Also with the deck being installed it keeps it out of the weather which makes it last even longer.

On the scupper detail we put another coating down as you can see in the video. The reason for this method is that often when water comes over to that section, it can sit there for a while, so as an added step we almost create a pool liner with the polyurethane coating so it’s as water proof as possible.

The project turned out great, and we know that the homeowner is going to enjoy that spot for years to come!