3 Flat Roofing Tips

Dec 28, 2021Construction, Education, Planning, Product

1. Drains

a. Hercules Retrodrain (Our Pick)

    1. For flat roofs, the best type of drain is a Hercules Retrodrain. This downspout drain allows for water to fall into the center of the roof instead of pooling up and eventually sliding down a gutter.
    2. The Hercules Retrodrains we use offer larger diameters such as 3,4,5 & even 6 inch openings for maximum drainage efficiency. This is especially helpful in the rainy PNW conditions where we get lots of rain.
    3. The flange on these drains is coated with TPO or PVC for easy membrane seal (explained in #3)
Poulsbo Leading Residential Roofing Expert
Poulsbo Leading Residential Roofing Expert

b. Traditional Gutters

    1. You can also use normal gutters with cladded metal flashing attached to the eave.
    2. The flashing has a special coating that chemically welds with the TPO or PVC roofing material.
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c. Bird Cages

    1. These are a much cheaper and accessible option and will do the job, but they’re not very durable and won’t last as long or do as good of a job filtering out debris which could lead to more clogs.

2. Framing a Skylight On a Flat Roof

    1. Skylights offer lots of natural light for your home and provide energy efficiency during the day as well.
    2. With a flat roof, framing in a skylight is simpler than a pitched roof. You don’t have to deal with as many angles this way.
Poulsbo Leading Residential Roofing Expert

3. Depending on the depth of your ceiling, you may need to build out a skylight tunnel (pictured below), which will require more material, so that’s something to keep in mind.

If you’re interested in having one built into your flat roof, give us a call to help you get it installed properly.

Poulsbo Leading Residential Roofing Expert

3. Roof Welding

    1. Your PVC or TPO roofing membrane is welded together using high-heat machines that chemically bond the pvc membrane with the special coated metal flashings attached to the edge of your roof for a watertight seal.
    2. Each pass of PVC or TPO material is heated by a special rolling tool (pictured below) that is heated to thousands of degrees to create the same chemical weld for a strong watertight seal.
Poulsbo Leading Residential Roofing Expert
Poulsbo Leading Residential Roofing Expert
If you found these tips helpful, leave a comment below. Reach out to us if you need any assistance setting up a consultation, or if you have any general roofing questions!