|
Posted by DanG on January 28, 2007, 9:08 am
If you cap the roof with ply or even pearl board, it is just about
like starting out new. The big difference is the weight of the
existing roof plus the new roof. If your structure can stand the
load, go for it. No one likes tear off and there is a definite
cost in time, money, and clean up/haul off to do the tear off. It
is the right thing to do.
If you don't have 1/4"/ft fall now, you should strongly consider
creating it in this re-roof. Modified bitumen is a great roof,
but you want to make sure water doesn't stand on it.
--
~~~~~~~~~~~~~~~~~~~~
DanG
A live Singing Valentine quartet,
a sophisticated and elegant way to say I LOVE YOU!
valentine@okchorale.org (local)
http://www.singingvalentines.com/ (national)
> Thanks Bill,
> No I dont know that it's mopped directly onto the tar. Its just
> 3 out
> of four roofers preferred to go right over the existing rather
> than
> pull it up, mentioning tar and PIA work. Everything on the
> building so
> far has been done to very good standards so I will now assume it
> was
> mopped over the appropriate paper first.
>
> Since most of the roofers want to leave it there, should I
> suggest
> maybe adding 3/8plywood, then 1" insulation, right over it,
> would it
> cause problems?
> I will try to reach some manufacturers monday, thr Grace roofing
> membranes look really good,
> Thanks
> G
>
>
> On Jan 27, 9:36 pm, "bill allemann"
> wrote:
>> 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
>>
>>
>>
>>
>> > 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--- Hide quoted text -- Show quoted text -
>
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap