How to apply tar or liquid flashing on a flat roof.

Old 08-18-22, 03:37 PM
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How to apply tar or liquid flashing on a flat roof.

Hello, I have a flat roof section, about 12x12 feet, in my house in which I would like to put some tar.
The roof was done new about 3 years ago, but in the last big storm a couple of drops went through.
I think it should have lasted more shouldn't it? I'm in South Florida. Maybe the extreme summers here wear it out quicker.
I called a roof company, and they told me over $2k to apply 'liquid flashing', so I wanted to give it a try myself.

The flat roof is mainly square, and it has tar applied all around its perimeter, where it joints the sloped roof. That stripe of tar looks craked.

Also, there is a part between two stripes of membrane where there is a little gap.
I thought I'd go to home depot, get a can of tar, an spatula and cover the cracks and the gap.

I'd like to ask you guys for opinions and advice on which product and maybe some tips on the application.


The cracked tar is at the joint between the flat roof and the sloped roof.

Gap between two stripes.
Old 08-18-22, 03:52 PM
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I'd recommend this product before I just used ordinary roof blackjack on it.

You will need a quart caulking gun... tool it flat with a disposable plastic putty knife or a wooden paint stick.
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