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william 08-23-2006 10:36 AM

flat roof
is it normal to have pools of water on the end of the slope of

a new felt flat roof.

redline 08-23-2006 01:42 PM

are there any drains on the flat roof?

AaronB 08-23-2006 06:28 PM

Felt and what? What does the edge detail look like?

Sometimes if the roof pitch doesnt overtake the edge detail build up, you may have a small "birdbath" at the roof edge.

I am going to assume since the roof is flat, and you say "felt" that it is a tar and felt roof? Like a BUR? Some come with gravel, some smooth surfaced, some with a mineral surfaced cap sheet.

In all of these cases, there should be a field membrane turned down over the roof edge, a perimeter metal on top of the roof field, and a cover strip configuration. The buildup of the multiple layers will raise the roof edge. If the roof pitch doesnt overcome this height, you will get a bath on the edge.

If it is gone within 72 hours, then almost all system mfg's consider this amount of water acceptable.

This is all speculation since I dont know your particular situation.

william 08-24-2006 09:08 AM

Flat Roof
Thanks to Redline and AaronB for prompt replies.The roof does not have a drain, it was leaking so we have just had new felt roofing system.
The rain water appears to be retained about a foot from the drainage end, this slopes but obviously not enough. We have just had heavy rainfall which left pools of water at the lower end of the roof but the wind seems to be drying it out at the moment so may not be as much a problem as we thought.

Talos4 08-24-2006 10:17 AM

Well, accepted guideline for standing water on a low slope roof is 48-72 hrs.

There will some debate on this but, if the water is still there in any substantial amount after that amount of time, you may need to consider tapering the roof edge to improve drainage.

AaronB 08-24-2006 05:17 PM

Can you post a pic?

jshirah 09-10-2006 08:57 PM

Would need some pics to tell you whats going on

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