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I have been roofing a long time and I will never understand why rubber companies want you to use lap seal. Every EPDM rubber roof I have ever been on the lap seal is always cracked up in 3 years or less. You can not trust glue and primer by itself so I use solar seal it is the best chaulk there is. I think it is even better than NP 1 . I had allot of problems with geo cell, Its not sticky enough . It will hang off a brick chimmney like spaghetti. With solar seal there will never be any leaks , it is a commercial roofing chaulk but allot of people will use it for siding. There is allot of diffrerent types of chaulk that almost have the same name. Solar seal is hard to find so I would order strait from the supplier
 

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EPDM lap seal

Most EPDM installations now use Inseam Tape (double-sided adhesive) for seams and endlaps. Scrub the overlapped and overlapping areas with ScotchBrite pads dipped in QuickPrimerPlus or some equivalent product, put down the tape (sticky side down), flop the overlapping portion of the sheet over it, then pull off the paper backing to expose the upper adhesive surface. Roll thoroughly and you are done--no lap seal, except around patches, flashings, etc.

Lap seal used to be used as insurance for laps made with splice adhesive. Inseam tape is a LOT better.
 

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Lap seal used to be used as insurance for laps made with splice adhesive. Inseam tape is a LOT better


My understanding was the lap sealant was to keep dirt from getting under seam(capillary action) and causing an uplift at edges leading to failure.
It was suppose to be put on after 24hrs,so all gases from seam seal had a chance to escape.
 
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I have been roofing a long time and I will never understand why rubber companies want you to use lap seal. Every EPDM rubber roof I have ever been on the lap seal is always cracked up in 3 years or less. You can not trust glue and primer by itself so I use solar seal it is the best chaulk there is. I think it is even better than NP 1 . I had allot of problems with geo cell, Its not sticky enough . It will hang off a brick chimmney like spaghetti. With solar seal there will never be any leaks , it is a commercial roofing chaulk but allot of people will use it for siding. There is allot of diffrerent types of chaulk that almost have the same name. Solar seal is hard to find so I would order strait from the supplier

ALLIED carries this stuff...prob also the rest of the big guys.
 

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Try to eleminate Lap Sealant

I install a lot of Firesone EPDM, and you should avoid dependending on Lap Sealant - it degrades in the sun.

Firestone switched to a whole line of products called "Quick-seam" these are all details which are 2-sided tapes. Most of these items eliminate the need for lap-sealant.

-- Firestone Building Products/Technical Data Base




John in MN
 
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