Flat roof coating

[John Warren]

Hi all,

I have a fourplex with a six year old flat roof that is around 3600 square feet. There are a few spots where water is puddling, and it looks like it could use a protective coating rolled on. Does anyone have any advice on which coating to use? Home depot and Menards both carry multiple types of products, and since it is going to cost a good bit I want to make sure I get the right type!

[Eric Rosner]

John Warren - There is no such thing as torch down rubber. Nine chances out of ten the roof is a modified roof (asphalt chemical composition; essentially a one square shingle) which is applied using a torch or set in cold process (roof cement). Are the seams approximately 33" apart? If so, that's definitely modified. Ponding generally forms when there is deflection in the substrate (deck) or the insulation is crushed or wet. If the insulation is wet, it should be replaced so the substrate does not deteriorate from the moisture, compounding the problem.

Once you've determined what is causing the ponding and address it; your next step would be to pressure wash the roof area to remove any coating no longer adhered to the roof system. DO NOT USE ANYTHING HIGHER THAN 2000 psi! Once the failing coating and debris is cleaned away, reapply a coating to the designated area.

Feel free to message me with any questions and I'd be happy to assist however I can.

Best of luck,

Eric