Flat roof drainage follow up

Just over a day and a half since that thunderstorm passed through, it hasn’t rained since, I went up the roof to check if there’s any more standing water left.

This is a view from the east side. The water around the skylight curbs are all gone. The entire roof looked dry.


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Flat roof drainage

Flat roofs are not very good on water drainage, especially if you want to have a roof top terrace which is what my design is. If you don’t have a roof top terrace, you can have a consistent pitch on your flat roof and drain the water to one side. That’s proven to be pretty effective. You can always have a higher pitch if you don’t have a roof top terrace, since no one will be walking on it. But in my case because of the roof top terrace and the accompanied parapet wall, the roof has to be designed to drain into interior points. This creates the necessity of creating complex low pitches on the roof to drive water towards where you wanted. And sometimes these pitches might not work the way you wanted.

No that the roof top is pretty much completed, I need to make sure that any standing water on the flat roof is within an acceptable range. And just so happens that today right after the metal sidings are installed, a quick thunderstorm passed through. A good time to check to see if the drainage is working the way it should be.

So here’s what I have immediately after the storm. The south side is the low side and that’s where the roof drains are. The south side mostly drained well. But the two skylight curb created a bit of a high point and is preventing some of the water from flowing towards the low points. This is a view from the west side. As you can see there’s a small body of water right around the skylight curb.


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Roofing day 7

The roofers are here to try to finish up the work. This is one complicated job. Already day 7 for the roofing, with yet more work to come later.

The front shade is completed. Looked pretty good. I will need to buy a few can of spray paint to paint the drain black later. I will have to do the same to the scuppers.

Front shade

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Roofing day 5 & day 6

The roofers continued their work on Saturday and Sunday. They were hoping to have it finished by end of Sunday but the weather was not cooperating. Even though the forecast calls for no rain, right in the middle of a nice afternoon, rain started to fall. So the work will have to wait until Tuesday since the next Monday is Victoria Day holiday.

They did have a lot of the work done. To the left was the original placement of the east side scupper. It wasn’t a good placement since it it directly over windows below. So I have asked them to move the scuppers 32″ to the east. The new scupper is now located at a good place. The scupper is installed at 2″ above the deck so that it serves as a backup scupper only and angled a bit downwards for better water flow.


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Roofing day 4

Today the roofer Tom & Kevin from Resco Roofing & Renovation came to continue on my roof.

Here’s the skylights. The larger one is Velux VCE 3030 electric powered skylight. There are two of them, one for the bathroom and one for the recreation area on the 2nd floor. The smaller one is Velux FCM 2222 fixed skylight. There’s three of them that will go right on top of the front open section.


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Roofing day 3

Today is Saturday and the roofers from Resco Roofing & Renovation is here to work on my main roof. I have called for 3 base layer in total plus the cap sheet for a total of 4 layers on the main roof. A typical flat roof will have 1 layer of base and 1 layer of cap sheet for 2 layers in total. Here’s the 2nd layer being installed. The first layer goes north-south. So the second layer goes east-west.


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Roofing day 2

Roofing day 2. Today the main roof on top of the second floor and the roof on the third floor is being worked on.

The entire parapet wall is covered with a layer of roofing membrane.


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Roofing day 1

With framing completed, the first thing I need to do is get the roofing done. This way at least water is not pooling in the house every time it rained. So Tom and Kevin from Resco Roofing & Renovation is here to do the flat roof. They will also be doing the skylight installation. And possibly they will also be installing the vertical siding on the parapet walls.

Early in the morning a load of roofing material is delivered.

Roofing material  Roofing material

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