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Question DetailsAsked on 8/9/2013

Is hydro-stop a good roofing material for a flat roof system?

I have a Town Home in St. Petersburg, FL that has a partial fiberglass and partial torch down modified bitumen flat roof. The fiberglass portion is considered to be part of the "patio roof," designed for foot traffic. I've met with several roofers and most suggest going over the fiberglass portion with peel and stick modified bitumen and then building a deck for the patio furniture and traffic. One roofer suggested Hydro-Stop and the examples I've been given look beautiful. Attractiveness is one thing but the most important is a roofing system that has a great warranty and will protect the home from these heavy FL rains. Any insight would be greatly appreciated.

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4 Answers


I was waiting for someone else to answer this for you because I am not sure of application on the fiberglass roof for this product. At worst you would have to put a base over that, the torch down is no problem. The problem with the modified bitumen is heat kills it and if it is cracked badly you might have to put the base sheet over that as well. I would think that in Florida the Hydro Stop would be the roof of choice since you can get it in colors and white would be good for reflecting the sun's heat and for the portion that gets walked on the have an application for that. The warranty is for 10 years and renewable for another 10 and I think 5 more after that. It is not damaged by the sun as much as the bitumen. The one advantage of adding the base layer is the added insulation it can provide to the house. You should ask the roofer if he can put it over the existing fiberglass roof.

Answered 7 years ago by ContractorDon


I have no experience with anything but straight epoxy or adhesive-adhered EPDM sheet (self-stick does NOT stick adequately to plastic or fiberglass for hurricane/tropical storm country) coatings on fiberglass awnings (which works will if sanded first to roughen the surface), but if you google this search phrase the first couple of hits appear to discuss this very application - might help you.

Answered 6 years ago by LCD


I'm an architect and I have specified Hydro-Stop and used it on my own home. It started in Charleston SC and one of the first roofs was on the Navy Shipyard. It performed so well during Hurricane Hugo the Navy Started specifying it.

Google Noisette and look at the white roof applications along Cooper River. Hydro-Stop.

Answered 5 years ago by macrowertgt


can i put new hydro stop on top of the old stuff

Answered 4 years ago by dan2001

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