I’m looking for any info on sprayed on icynene roofing systems. I have a condo building with a flat roof that utilizes center roof drains for water removal. These drains tie into our waste lines on the interior of the building (which is no longer allowed by code). A problem occurs when we get severe down pours of rain. Water actually bubbles out of toilets and sinks on the second floor of the building (the first floor being parking garage ) causing water damage to many of the units. We would like to cap these drains, pitch the roof to the rear of the building, and add gutters, down spouts that would tie into the garages sewer drains.
I’ve seen home improvement shows that showed sprayed on icynene to repitch a roof and/or remove low spots, then a one-ply roofing put over it. My question- is this a better and more economical way to solve this problem verses having the whole roof re-framed with lumber and plywood. I think the sprayed on system would also give other benifits by increasing the insulation and sound proofing the roof as well.
Thoughts, comments, know of a qualified contractor in the Chicago area, let me know.
John
Replies
http://www.icynene.com/lookup.html
Phill Giles
The Unionville Woodwright
Unionville, Ontario
Phill Thanks for the web link, but i'm finding out that most of the referred sources only spray to insulate walls ceilings attics etc. many said they never even heard of using it as a roofing material. Oh well, my search continues thanks again
johnvandorpe
I suggest you send the company an Email and ask to commit one way ro the other; I've seen foam covered with pea gravel in the SW, but I can't swear it was Icynene..
Phill Giles
The Unionville Woodwright
Unionville, Ontario
John,
You can use sloped insulation panels instead of trying to spray apply a slope.
We use 10s of thousands of feet of this stuff all the time. Concrete roofs are typically flat and the slope is always generated by the roofing system.
Give me a size and elevation and I'll suggest a product if you like.
Gabe
Gabe,
I've talked to roofers who suggested your approach with the panels. Unfortunately, by the time the center pitch is eliminated and the new pitch to the rear is created with proper slope, the build up may get too high at the front coping walls.or so they say. The spray on type may create the same problem, but I would like to get an experienced installer to at least look at it. Thanks for the info none the less.
johnvandorpe
John,
I use all kinds of insulations and typically I use 2 types of roofing. Inverted and Mod-bit. You would have to better describe the situation in question for me to go into better detail.
The benefits of the insulated panels are increased when you factor in the thermal benefits of "raising" the bridge instead of lowering the water to solve your problem.
Our last spray foam installation was for 88,000 sq. ft. and I think I know a little about it, at least enough to give comment on the subject.
Tell me more about your problem and I will try to honestly answer your concerns.
Gabe
Sounds like your storm drains are tied into your sanitary drain. Have you investigated providing dedicated storm drains connected to the existing roof drains. This would prevent the backing up of toilets, floor drains, etc. and would probably be cheaper that the roof reconstruction. I am not a fan of using foam to build more than 6" and it sounds like you would have much more than that at the front of the building.
Im with Janation on this, the cheapest and best way is to reroute the drains from the homes sewage system. I cant beleive someone would actually do that in the first place.