John,
I have worked on a few flat (low slope) roofs and in my experience when you
have that much organic material on a roof, it is often ready for
replacement. I have never cleaned roof ballast. If you have not already done
this, I suggest a thorough survey of the roof condition.
I would also caution that doing this much work on a roof is likely to damage
the membrane leading to necessary repairs but worse, leaving possible damage
to the membrane that goes unnoticed until one or more rain storms leaving an
unhappy owner.
Does the roof have a warranty? Better check to see if this would void the
warranty or if the warrantor has a process for doing this!
If you do have a sound roof, I think the only folks who should be doing
something like this are roofers. I suspect they would be reluctant to do
this work based on the above issues. Usually the only time you remove
(remove, clean, reapply) ballast is to replace or recoat a roof so a few
nicks are not big issues.
Sorry for being so negative...
Eric Hammarberg
Director of Preservation
Vice President
Thornton-Tomasetti Group
LZA Technology Division
641 Avenue of the Americas
New York, NY 10011
Telephone: 917.661.8160
Fax: 917.661.8161
Mobile: 917.439.3537
email: [log in to unmask]
-----Original Message-----
From: John Callan [mailto:[log in to unmask]]
Sent: Monday, September 19, 2005 11:02 AM
To: [log in to unmask]
Subject: [BP] Roof maintenance ?
I've recommended that a roof be cleaned. Its a stone ballast membrane
roof, but the ballast has acquired massive amounts of organic
material, mud, dirt, etc. Any idea HOW such work is actually done,
or what kind of a trade or contractor would do it?
If it were my house, I suppose I'd get up there with a plastic snow
shovel and screen all the stone, and then hose the debris into the
gutters. But, this is not my house. This is one of them modern
buildings with the roof drains that go down into the building,
collecting under the main slab. If something clogs up in there (and
it may have already done that on one occasion) its going to be an
awful mess.
So I suppose one shovels the debris over the side where it can be
collected, moved by wheel barrow to someplace where it can dry and
then disposed of. Does that sound reasonable?
-jc
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