PEEL N STICK vs stucco lime – see this?
PEEL N STICK vs. LIME
Has anyone notice the lime in stucco pulling the oil out of oil-based peel n stick.
We are seeing some examples of what appear to be the lime reacting with the membrane here in SoCal and wondering if we need to shift to the butyl stuff for our repairs.
The ToolBear
“Never met a man who couldn’t teach me something.” Anon.
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"being human is a complicated proposition"-DavidxDoud
---Never show a fool a half finished job---Grampsy
I feel like a bunny in a hillbilly meadow at noon..........jjwalters
What is the ACTUAL brand name of the type of flashing membrane that you are currently using?
Davo
What is the ACTUAL brand name of the type of flashing membrane that you are currently using?
ProtectoWrap is in the van.
However, the question refers to conditions from years past that we find when doing repairs. Who knows what wraps they used. One repair, we found only the strings and bits of paper left from the non BSAM flashing tape used at the windows. The ToolBear
"Never met a man who couldn't teach me something." Anon.
Q: What reaction did you see with the peel 'n stick?
The fiber strings and paper sounds like what I've seen left of the old black Moistop flashing paper. Stucco sometimes sticks like heck to the black poly(?) facing.
I remember reading some company lit warning about desert climates melting the bitumens in their peel 'n stick--butyl won't melt. The more likely thing is that a sealant with a solvent in it is reacting (liquefying) the modified bitumen. Lime in stucco is not a likely culpret, I think.
The fiber strings and paper sounds like what I've seen left of the old black Moistop flashing paper. Stucco sometimes sticks like heck to the black poly(?) facing.
Not knowing which paper was used, I didn't say Moiststop, but it certainly looked to be in the style of...The ToolBear
"Never met a man who couldn't teach me something." Anon.
So, What reaction did you see with the peel 'n stick?
So, What reaction did you see with the peel 'n stick?
Myself, none, yet. My boss, who's experience is vast, reports the findings in the first message of the thread. He thinks the lime is getting to the stuff.
I have seen the vanishing "Moiststop-like" (actual brand unknown) paper backed window flashing tape turned into bits of paper, pulp and a web of strings. In effect, there was no flashing at the windows. Even better, some Gomer got the flashing-tarpaper detail #### backwards so the water below the window flowed into the wall structure.
I really like the old tar paper - the real stuff. I've seen windows opened up that dated back 60 yrs and not a bit of problem, tar paper intact, no rot, etc. The ToolBear
"Never met a man who couldn't teach me something." Anon.
"The more likely thing is that a sealer with a solvent in it is reacting (liquefying) the modified bitumen..."
I certainly agree that this is a real possibility...but may not be the only culprit...there could be other factors. I do know that you cannot seal an Epdm ( rubber)roof membrane with petroleum distillate based roof patching ( ie: wet or dry plastic roof cement). This kind of product will eventually weaken the membrane and cause it to breakdown and tear.
Perhaps some installers used this stuff as a caulk overtop the bitumen flashings. Roof cement is black and comes in caulking tubes and most bitumen flashings are black and so maybe some installer thought the 2 products were compatable since they appear that they would be. But I doubt that not every install job used roof cement as caulking...so there must be other underlying factors....lime can be caustic...maybe this is the true factor behind the deteriated flashings.
Perhaps someone should constact Moistop and inquire as to whether they are aware of any product failures and do they know what may be causing them. I'm sure Moistop and other similar companies must have a R&D department or at least contract out with someone to run tests and verify their product. It would be interesting to hear what they have to say.
Davo
Davo