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 August 3rd, 2014Just 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.
August 1st, 2014Flat 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.
March 30th, 2014The design of the big marshmallow house calls for a flat roof to build a roof top terrace. Flat roof, it is actually not technically correct. You will never build a house with a real flat roof. Because if you do, you will have problem with water sitting on top of the roof causing damage to the house. The accurate term will be a low slope roof. The “flat roof” still have a slope to facilitate water drainage, just at a very low angle. Any roof that has slope of less than 2:12 or a rise of 2″ over 12″ or 9.5 degrees is considered to be a low slope roof. I have designed my low slope roof with two interior roof drains. But to have proper drainage, the roof needs to be slopes so that the water flows towards the roof drains. And this is what the framer came up with. Below is a top view of the house with the north pointing up. The two circle on the bottom (south side) is where the two roof drains will be located. The four diagonal lines are valleys while the vertical line in the middle is a peak. The north side is about 4″ higher than where the roof drain is. Making this roof with an overall slope of 4″ rise over 15′-8″ or 1.2 degrees. And as you can see with those diagonal valleys and the peak in the middle, the design manages to push all the water towards where the roof drains will be as indicated with the red arrows.
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