Flat roof question

I have looked a alot of different systems but have never seen this style. The membrane was not rubber but instead a weaved thin plastic similar to lumber wrap. Has anyone seen this and what is the service life of a roof like this??

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my wag tpo

http://www.nrc-cnrc.gc.ca/eng/ibp/irc/ctus/ctus-n30.html

let us know if you determine actual product manufacture, i haven’t encountered the blue scrim

imo from photos ballasted tpo

http://www.nrc-cnrc.gc.ca/eng/ibp/irc/ctus/ctus-n30.html

termination at drains is wrong, you probably caught that ;~))

imo from photos ballast applied tpo

http://www.nrc-cnrc.gc.ca/eng/ibp/irc/ctus/ctus-n30.html

termination at drains is wrong, you probably caught that ;~))

That looks like it…but, man, Greg has his work cut out for him removing the balast to inspect it, eh? :p:mrgreen::smiley:

From above site:

I did catch the drain being wrong. There are four of them and all of them need to be repaired. Thanks for the info on the roor system:mrgreen::mrgreen::mrgreen:

The only thing bothering me still is that the seams are not welded but overlapped. Wondering if the membrane is only being used as protection and there is a membrane under the foam. It did look like plastic was layed down under the foam?? Roof is 24 years old but seems to be in great condition.

Man, that looks like synthetic underlayment to me, not meant for this application but for sloped roofs and the manufacturers usually list specific overlap requirements for low-slope. This is not even low-slope but basically flat.
Here are some photos of synthetic underlayment for comparison.

Evaluation by a qualified roofing contractor.

The top layer is more like a lumber wrap. I needed to go back today so I went back to take another look. I found a bitimous coating on the concrete surface, then 6mil Poly, 4" extruded foam, plastic weaved wrap and then the ballast. Each layer protects the next. should be a long lasting roof.
Any thoughts??:wink:

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It’s beyond my level of expertise, I specialize in steep-slope roofing materials.

No Problem Kenton, I have never seen it myself and I thought I had seen them all.:shock:

Ask Dale Duffy

I would but not sure who that is and could not find him on the forum??

Guys what you think about this flat roof…

What do you think about it?

Your the one working at an engineering firm…

:p:p I think he’s ready for CMI.:p:p

I think he’s “undercover CMI”! :slight_smile:

I’m totally convinced that that roof is sort of granular.