Dibiten Specs
QRFL
Fri Aug 19, 2005 9:21 pm
i just call the Dibiten technician to go over the two ply specs. he told me that the egde detail goes like this:
1) base
2) Mastic on the edges
3) Set low rise onto mastic
4) Torch your smooth
5) Torch your granulated
I am sure Master has something to say
1) base
2) Mastic on the edges
3) Set low rise onto mastic
4) Torch your smooth
5) Torch your granulated
I am sure Master has something to say
Master
Fri Aug 19, 2005 10:15 pm
I would have to look at their specs, but the way I would do it is this....
base sheet turned down past the nailers and past (min 1") beyond the top of the wall, then burn the smooth in a perimeter fashion to eliminate the seams as much as possible at the edge to be terminated (this is not an NRCA spec, but I do it anyways for a more solid bond with less T's), prime BOTH sides of the flange, cut perimeter metal to fit, heat the surface of the smooth (also not an NRCA spec, but wha do they know LOL), and ste the dried primed underside in the hot bitumen and fasten. Then I would like to run the granulated in the same perimeter fdashion first, starting with a hallf sheet so as not to build up seam on seam, and then tie it all together with proper laps and full bonding procedures.
If the rigght heat is applied properly and the sheet is applied while hot, this bond is TOIGHT! I do not like mastic on my granulated.
base sheet turned down past the nailers and past (min 1") beyond the top of the wall, then burn the smooth in a perimeter fashion to eliminate the seams as much as possible at the edge to be terminated (this is not an NRCA spec, but I do it anyways for a more solid bond with less T's), prime BOTH sides of the flange, cut perimeter metal to fit, heat the surface of the smooth (also not an NRCA spec, but wha do they know LOL), and ste the dried primed underside in the hot bitumen and fasten. Then I would like to run the granulated in the same perimeter fdashion first, starting with a hallf sheet so as not to build up seam on seam, and then tie it all together with proper laps and full bonding procedures.
If the rigght heat is applied properly and the sheet is applied while hot, this bond is TOIGHT! I do not like mastic on my granulated.
SYS
Sat Aug 20, 2005 1:00 am
To me this sounds strange I have never put granular surface torch on over smooth torch on. Maybe one of those two layers but never both at the same time. Could ya enlighten me why both layers are being installed? Or am I just misunderstanding something.....Man them rolls get heavy after about 4 hours of movin them around.
Master
Sat Aug 20, 2005 2:49 am
Move them once into install position, then install this 20 year spec.
Pride_roofing
Sat Aug 20, 2005 2:57 am
well for once i have no clue what is going on. FLats are my partners specialty.
QRFL
Sat Aug 20, 2005 5:39 am
Well Master what do you think of running the smooth normally and then the granulated 4.5 in a perimeter fashion?
eliminating that bump 3 feet from the rakes.. once you melt the 4.5 on top of the 4 the smooth becomes practically seamless anyway.
priming both sides of the lowrise ... mmmmmm... not a bad idea.
while i have you here Master what do you suggest as finish detail at the end of a cant-strip where it meets the drip??? you have to somehow taper the cant to nothing and i have seen guys trying to press the torch down only to have it pop back up in that one spot.
eliminating that bump 3 feet from the rakes.. once you melt the 4.5 on top of the 4 the smooth becomes practically seamless anyway.
priming both sides of the lowrise ... mmmmmm... not a bad idea.
while i have you here Master what do you suggest as finish detail at the end of a cant-strip where it meets the drip??? you have to somehow taper the cant to nothing and i have seen guys trying to press the torch down only to have it pop back up in that one spot.
Master
Sat Aug 20, 2005 12:18 pm
Q, thereason I run my sheets in a perimeter fashoion is to eliminate seams and overlaps at the egde that I have to fold on the first run, and then the second run is nice to do it with since you are tryingto det a solid bond to the edge of the perimeter metal.
Spec says to run all according to waterflow, but this gets to bea pain in the hump because of all the t'seams. Not a pain in the hump, but more like an irritation due to the fact that I know my other non-spec'd way is cleaner, neater, looks better and serves me and my customer well.
THe cant hase to be tapered back on the end or simply flashed in like any other dteail. You cannot avoid cutting the sheet at the end in orderto wrap it properly.
Spec says to run all according to waterflow, but this gets to bea pain in the hump because of all the t'seams. Not a pain in the hump, but more like an irritation due to the fact that I know my other non-spec'd way is cleaner, neater, looks better and serves me and my customer well.
THe cant hase to be tapered back on the end or simply flashed in like any other dteail. You cannot avoid cutting the sheet at the end in orderto wrap it properly.
QRFL
Sat Aug 20, 2005 5:20 pm
ok i understand the perimeter run , ive seen it on hot and i also think its better to have the seams away from the edge metal, what i was trying to emphasised is that the smooth can be run with the pitch since the metal will go over it anyway, now the granulated its a different story since that will have exposed edges.
ok cool nice discussion tx Master
ok cool nice discussion tx Master
Master
Sun Aug 21, 2005 4:11 am
Q, I like it this way, and it is, of course, not spec. It works better than spec, but is not.
If you install a ten year spec, then your cover strip will have to cross the t's, and in this business, the less t's crossed, ther better.
If you install a ten year spec, then your cover strip will have to cross the t's, and in this business, the less t's crossed, ther better.
QRFL
Sun Aug 21, 2005 5:18 am
t's ???
no comprende
no comprende
Master
Sun Aug 21, 2005 3:22 pm
"t's" are t-seams. They are the seams created when the cover strip (in this scenario) is laid perpendicular to the field sheets and form a "T". These have been known to open up if the installer isnt performing up to par, but all t-seams have to be tended to with a little more love than the reest of the field.
