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arubatan 03-02-2007 08:49 AM

EPDM installation
I am going to have EPDM installed over my 20x17 low slope roof. Is it necessary to remove the current roof material first, or does the EPDM go directly over the current roof? Roofer said there will be 1 seam.

slim451 03-02-2007 01:23 PM

What is the existing roofing material?

arubatan 03-02-2007 01:27 PM

Well, the past few summers I've been applying this black sealer stuff to the entire flat roof. It looks like asphalt.

roofwiz74 03-03-2007 07:11 AM

no asphalt.he could go over with 1/2 insulation board first though.

AaronB 03-03-2007 09:36 AM

Yeah, like roofwiz would need to separate the two roofs. 1/2" wood fiber board could do it, but there is better bonded strength to ISO board insulation.

RooferJim 03-03-2007 02:22 PM

Iso board is the way top go. stay away from fiberboard "hardboard" if you ever have a leak it absorbs water like a sponge.


roofwiz74 03-04-2007 09:41 AM

ya'll have to forgive me for not saying iso first.fully adhered and self laminated flashings are the only way to go.I would rather use 6"seam tape than lap cement.

slim451 03-04-2007 08:58 PM

I wonder what you have in the way of support for the roof. I know iso board doesn't weigh much but you should check to make sure you don't end up with a framing failure.
That would make for a very expensive roofing job.

AaronB 03-04-2007 11:22 PM

The ISO, the glue, and the EPDM weight less than a pound per foot.

powerinc 03-06-2007 02:43 PM

question for roofwiz
You stated in a previous post that you use fully adhered and self laminated flashings. Is this flashing the uncured rubber, that is about $170 for a 100ft roll . Also is this the type of rubber flashing I would need to make an overlap seam for a rubber roof and a torch down roof. The roof is one roof being shared by two homes. The homeowner next to me has a rubber roof and I am going to install a torch down roof to my home. The thing I have been told is that you just can't make an overlap seam of a rubber roof and a different type of roof because any type of roof cement would damage the rubber roof. Thanks for any help.

AaronB 03-06-2007 03:27 PM

Yeah, do not try to tie those two roofs into each other. If there is parapet, then you could be good. If the tie in is lying on the flat, you would be better off sticking to the surrounding material type.

I have seen EPDM successfully adhered to smooth bur before, but not the other way around (mid bit included)

roofwiz74 03-06-2007 06:43 PM

it's uncured with glue on it already.kinda.
we've done a bunch of temporary tie-ins with uncured and t-bar and some caulk,they never stayed long so..
is there a wall or expansion joint there?

powerinc 03-06-2007 07:21 PM

No, it's one 20ft. x 25ft. roof, with 10 x 25 being owned by me and the other 10 x 25 being owned by my neighbor. I don't care much for the rubber roof on his half of the roof, so I want to put the torch down on my side. Any ideas?

AaronB 03-06-2007 10:49 PM

What dont you like about his EPDM roof? You guys would be so much better off doing the whole thing at once, contiguously.

powerinc 03-07-2007 04:56 AM

His side of the roof is already 10 years old and showing signs off wear. For that reason I want to put something else on my side of the roof. I can maintain the torch down for many years to come, and is easier, in my opinion, to fix any leaks, if found in it.

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