[tonit32]

We have a flat rubber roof which was put on about 18 months ago.

About a year after it was put on we had a section of our bedroom ceiling collapse.
This was caused by water draining to a point in the roof deck over this point of the
Ceiling and then falling down on the ceiling. There is no leak actually over this point.
It seems to be getting under the rubber and then moving to this point.
(This means the roof deck is not correctly sloped everywhere, but I don't
Think anything can be done about that).

Since then the roofer has been out many times, and made various repairs
To the rubber, the skylights and perhaps elsewhere. The problem seems to
Have improved but we still get water emerging from the roofdeck at this point
During heavy rain.
(We have not repaired the ceiling, and this is one of the lowest points of the
Roof deck, so any water which gets in will drain to this point).

The water seems to be travelling from somewhere else. It takes about 8 hours
After the start of heavy rain for it to emerge, at which point its just a drip.
However this drip goes on for a while and when we collect it in a bucket it can
End up being a substantial amount of water - maybe up to a quart.

Its been about six months since the ceiling collapse, and I'm at a bit of a loss
As to what to do. Can anyone suggest a way to help find the leak or other things
To look for. Is there something that could give us a clue - for example popped nails (which we have a lot of) ? A friend suggested it could be the tuckpointing on the
Chimney or the parapet wall (we live in a towhouse complex).

Any help would be greatly appreciated.

[Kstar4u]

Maybe you can get some insight on the leak location by using a garden hose on the roof to supply water from directions that seem most "natural" and watch the flow for any eddies or low spots, where it pools. You didn't describe the type of building you have the elastomeric roof on but it sounds like "manufactured" construction. No matter what kind of structure it is... when it comes to roofing... every nail is a potential leak. If you can identify an area where the water seems to pool or slow considerably... and if re-sealing that area won't improve the slope (hence the flow off the roof)... you might consider adding a "cricket" to change the dynamics of the run-off. A "cricket" is a structure added to the roof... installed atop the existing roofing... that adds required pitch/slope to enable water flow off the roof. There are good elastomeric roofing products that will seal the existing roof and you can always hire a contractor to apply a "hot mop" roof if necessary.

[kohala55]

How big of roof is it.

[tonit32]

The roof is about 25 x 15 feet