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Old 03-07-2010, 12:36 AM   #1
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Rubber Roof Sealant


i have leaks in my flat rubber roof. not sure where, but i see some gaps around the chimney where lead flashing meets the rubber membrane.

i went to HomeDepot but they don't supply rubber roofing materials. a guy recommended Henry Flashing Master, said it works, even though the description clearly states that it is not recommnded for rubber roof.

what product should i use for sealing the gaps between my rubber roof and the lead flashing? and where can i buy it? is it safe to use Henry Flashing Master?

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Old 03-07-2010, 08:25 AM   #2
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Where do you see these alleged gaps from? From inside? Outside? Do you have a pic of the gaps youre talking about as well as the area in the house where the leaks are showing up in relation to the chimney?

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Old 03-07-2010, 09:03 AM   #3
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Rubber Roof Sealant


gap is from outside. i can't see any visible leak from inside.

lead flashing is applied around the chimney base. the top of the flashing seems to be sealed pretty well insde of brick veneer. the bottom of the flashing meets the rubber roof and it seems that there are gaps.
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Old 03-07-2010, 09:11 AM   #4
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Rubber Roof Sealant


lead flashing around chimney base
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Old 03-07-2010, 04:04 PM   #5
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Rubber Roof Sealant


This is probably a counter-flashing. If it is not leaking, then leave it alone.
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Old 03-07-2010, 04:08 PM   #6
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Rubber Roof Sealant


Re-reading your original post, I do suggest that you find the source of the leak instead of taking a shot in the dark and gooping stuff up.

Where are the leaks showing up in the house in relation to the chimney? Which way is your roof sloped? What type of roof deck do you have? What is the construction of all roofing assemblies present?

That info should give us a good starting point by which to help you solve your problems.
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Old 03-07-2010, 04:42 PM   #7
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Rubber Roof Sealant


>>Where are the leaks showing up in the house in relation to the chimney?
i see water driping from the framing around the chimeny base. luckily the ceiling is not closed at the moment.

>>Which way is your roof sloped?
it slopes towards outside.

>>What type of roof deck do you have?
Rubber membrane roof.

>>What is the construction of all roofing assemblies present?
i don't understand this question. please elaborate.

thanks.
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Old 03-07-2010, 04:48 PM   #8
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Rubber Roof Sealant


more pics would help. a shot of the chimney from ferther back, an overall shot of roof if you can, a pic of the roof edge and any pudlling, shot of leak inside
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Old 03-07-2010, 08:06 PM   #9
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Rubber Roof Sealant


I was not asking what type of membrane you have. That was apparent with the original post and the pictures. I was asking what type of roof deck do you have, meaning the structural element of the flat roof above the rafters.

The question you didn't understand... is there only one roof on the house, or did someone lay additional roofs over existing ones? This can have an effect on water travel.
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Old 03-07-2010, 08:54 PM   #10
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Rubber Roof Sealant


This is all brand new roof. I don't know what type of roof deck is it. What are the possibilities? How can I tell?

More pictures to come.
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Old 03-07-2010, 09:01 PM   #11
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Rubber Roof Sealant


more pics.
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Old 03-07-2010, 09:14 PM   #12
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Rubber Roof Sealant


the red ink circles the chimney base inside of the house. notice the 2x4 is wet from the rain.
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Old 03-08-2010, 05:58 AM   #13
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Rubber Roof Sealant


Look VERY closely at all the seams along the edge, and the chimney. Look at the exposed joints of the metal drip edge just 'outside' the rubber.
Get that Grace OFF the roof. It will literally eat into EPDM. It's extremely imcompatible.

If it's new, why isn't the roofer looking at it?
If the leak is found, Black Jack Neoprene, and one of the GeoCel caulks are compatible sealants. (Tube Caulk) IT MUST say EPDM sealant on the tube.
Karnak Ultra 19 may be compatible.

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Old 03-08-2010, 06:51 AM   #14
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Rubber Roof Sealant


If you don't mind me asking, why isn't the roofer who installed the roof finding and fixing this problem?

There's no obvious problem that jumps out of those pictures,
I don't like the counter flashing wrapping onto the roof, but that's something that only sometimes creates a problem and normally years down the road, not months.

Take a good look at the top of your chimney and make sure there's no cracking in the sealant around the pipes, etc.
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Old 03-08-2010, 08:22 AM   #15
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Rubber Roof Sealant


roofer was fired for other reasons.

i don't know what that "Grace" stuff is. but it is already stuck on the rubber. i guess i will have to rip it off. but i am afraid of creating more problems in doing so.

the outside perimeter of the flutes are pretty tighly sealed, i can't see any gaps.

i do see some very small cracks in the brick mortar. not sure that would've created the leak.

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