Large Leaking Tar Flat Roof - Roofing/Siding - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding


Thread Tools Display Modes
Old 03-16-2008, 01:10 AM   #1
Join Date: Mar 2008
Posts: 2
Rewards Points: 10

large leaking tar flat roof

I own a large, old (late 1800's), mixed use building with a flat roof in upstate NY. The roof has been leaking to the point where I definately would like to do something about it this summer. The roof is in two large sections, roughly 50x65 and 65x65, so approx. 7200 sq ft. The roof is "flat" and it is what I am pretty sure is tar. Seams of what I imagine is tar paper are starting to show through.
I started doing my own research to figure out how I was going to attack this. I'm rapidly coming to the conclusion that I will need help. While I have done all the interior remodeling (framing, plumbing, electrical, etc.), I have never done any roofing work.
My first thought was to go over the existing roof with wood and a fully-adhered rubber roof. My reading leads me to believe this may be a bad idea due to trapping moisture? ripping the roof off seems a monster project. My rough investigation gave me a cost of $18,000 and that was doing it myself with 3-4 man help.
I may re-tar, but such a short lived solution, anyone have any thoughts? and possibly a product/application tips?
any and all thoughts are appreciated.


erbilliards is offline   Reply With Quote
Old 03-16-2008, 10:42 AM   #2
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000

It depends on how severe the seams showing through are as you described.

Pictures would help immensely.

If the old hot asphalt glaze coat has deteriorated from lack of being maintained, yet otherwise remain flat and the surface coating is just wearing out, then a fresh application of a new hot asphalt can be mopped to the surface.

If they look like they are waving at you, but there are no sign of moisure entry, a heavy 43# base sheet and a minimim of a 2-ply to 3-ply 15# felt roof could be mopped down on top, depending on how many roof systems are currently installed.

With both options, the flashings should be resealed and have new roof cement applied to the seams. Also, any other maintenance issues should be addressed at the same time.



Ed the Roofer is offline   Reply With Quote
Old 03-16-2008, 11:59 AM   #3
Join Date: Mar 2008
Posts: 2
Rewards Points: 10

will post pictures


Thank you for the informative reply. I will go up there Tommorrow or Tuesday and take pictures and post them. I do believe the surface coating is just wearing out, but mine is an opinion based on next to zero experience. Just judging from what I can see.

erbilliards is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
tar and grvel flat roof leaking alexbadiuk Roofing/Siding 4 01-11-2008 01:29 PM
Leaking Cement Flat Roof surritab Roofing/Siding 1 01-31-2007 11:48 AM
Flat roof - Rolled? - leaks Advice? JJ2001 Roofing/Siding 4 11-19-2006 06:17 AM
Flat roof leaking tractorboy Roofing/Siding 7 10-10-2006 07:22 PM
Help- leaking flat roof, alum?metal? xoroniox Roofing/Siding 1 04-24-2006 11:03 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1