| Author |
Message |
Greg Mann (Unregistered Guest)
Unregistered guest
| | Posted on Wednesday, July 25, 2012 - 12:21 am: |    |
I am debating between KEE and PVC roofing systems for my flat-roof residence in NM. What material should I go with and what thickness would be recommended for each type material? Our home is also overheating in the summer and I am considering adding 1" of ridged polystyrene over the existing tar/gravel build up roof... any suggestions and experience most appreciated. Thanks |
SCOTT PIPER (Unregistered Guest)
Unregistered guest
| | Posted on Wednesday, July 25, 2012 - 12:23 pm: | |
The best advice I can give is don't roof over the top of another roof unless you absolutely have to because of budget. To many problems happen when you trap an old roof under a new one. Not a big issue with shingles but in single ply low slope roofs it is not a good idea.
The thickness would depend on the traffic, puncture potential, etc. Some single plys can be manufactured with a fleece back that would increase the puncture resistance of the system without increasing the membrane material thickness.
Your location may make some of this information more or less important. ie:Fewer freeze-thaw issues to deal with in NM that in the upper midwest where I am. |
John Bunzick, CCS, CCCA, LEED AP
Senior Member
Username: bunzick
Post Number: 1422
Registered: 03-2002
| | Posted on Thursday, July 26, 2012 - 03:42 pm: | |
If there is only one layer of existing roofing, and it has not had a history of leaking, I'm not too concerned with roofing over it. However, leaks may indicate wet insulation, and reroofing can trap that moisture. Insulating would probably help to keep heat out of your home, just as the reverse would be true in a cold climate. In any case, you would need to install a substrate material for the new roof as you cannot install it directly to BUR (although some may permit it using fleece-backed materials. I believe the performance of KEE and PVC for residential is going to be essentially the same. I'd worry more about finding a top quality contractor who is familiar with membrane roofing than the particular membrane technology. Also note that these membranes are intended for commercial installations and you probably can't get a warranty. Some membrane manufacturers will not even allow these to be installed in residential (controlled via their sales channels). These are probably more critical factors than the plastic alloy used. |
J. Peter Jordan
Senior Member
Username: jpjordan
Post Number: 470
Registered: 05-2004
| | Posted on Thursday, July 26, 2012 - 04:20 pm: | |
To complicate matters, at least one manufacturer is offering a hybrid of KEE and PVC. I expect to see a lot more of this in the future.
It is my understanding that DuPont is no longer making Evaloy sheet (either flashing or roofing). |
anon (Unregistered Guest)
Unregistered guest
| | Posted on Thursday, July 26, 2012 - 05:48 pm: | |
As explained to me, KEE is a PVC alloy. Always has been - at least with Fibertite. |
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