do you know that hot tar is on the sheathing, or is that just an assumption?
On flat roofs, felt is applied first to sheathing with fasteners, then the
hot tar process is done on top of the felt.
If tar was applied directly to the decking, it was probably done by
amateurs.

Bill

"AustinScoobee" wrote in message
oups.com...
Hi all.
We are taking bids to reroof a low-slope (flat roof) and are looking
at the new modified bitumens( 2 or 2 ply sys). There are lots of
types, but all seem to mention that the base sheet be applied to clean
dry wood decking.I defy anyone to get hot mopped tar off of our
decking. You could likely get the old roll roofing off but the tar it
was set in??!
We are getting many varied ideas as to how to best re-roof it and
wondered what was the norm?

So far we have,
1. Remove it as best as possible and screw down the base sheet, then
the self adhesive 2nd sheet then Cap
2. Leave the roof as is and screw down the base sheet to it. then the
2nd self adhesive sheet then Cap
3. Hot mop OVER the old roof and apply base sheet. then the 2nd self
adhesive sheet then Cap

4. screw down 1" rigid insulation, then use self ashesive base coat,
then the 2nd self adhesive sheet then Cap


Any thoughts and ideas Every roofer to come out has a different idea!

G--