Epoxy Coating on OSB to prevent nail pull out??
Epoxy Coating on OSB to prevent nail pull out??
(OP)
Good day!
I recently saw an application of a marine epoxy coating to strengthen a historic brick wall. That was in Europe.
I'm tempted to use this technique on a cedar shake roof. The roof is built of 1/2" OSB sheating with No:1 heavy shakes installed over the sheating using 2" No. 6 shake nails.
The nails penetrate the OSB all the way through, protruding about 1/2".
What would happen if we used some kind of epoxy coating to brush over the protruding nails, inside the roof structure and create a surface bond between the OSB and Nails? That way strengthening the design with comparatively little expense.
Any comments/suggestions would be great.
Thanks
Pete
I recently saw an application of a marine epoxy coating to strengthen a historic brick wall. That was in Europe.
I'm tempted to use this technique on a cedar shake roof. The roof is built of 1/2" OSB sheating with No:1 heavy shakes installed over the sheating using 2" No. 6 shake nails.
The nails penetrate the OSB all the way through, protruding about 1/2".
What would happen if we used some kind of epoxy coating to brush over the protruding nails, inside the roof structure and create a surface bond between the OSB and Nails? That way strengthening the design with comparatively little expense.
Any comments/suggestions would be great.
Thanks
Pete






RE: Epoxy Coating on OSB to prevent nail pull out??
An epoxy coating such as you suggest for your OSB sheathing would do very little to increase the withdrawal capacity of the nail. I would expect that there would be minimal bond of the epoxy to the protruding nail head. I specify a ring shank or spiral shank nail for the anchorage of the OSB to the trusses/rafters. The anchorage of the shingles to the sheathing is per Code and/or per the manufacturer
Why do you need more withdrawal capacity?
RE: Epoxy Coating on OSB to prevent nail pull out??
Further, most of the time in shingle and shake applications, the failure is not in "pullout" but "pullover" where the material around the nailhead fails and the nail stays in place as the material flies away.
RE: Epoxy Coating on OSB to prevent nail pull out??
Maybe I am remembering it from Don Breyers or SlideRuleEra's book (when he writes one).
There is discussion of clinching in the Forest Product Lab's "Wood Handbook" and the 1997 Commentary for the N.D.S
RE: Epoxy Coating on OSB to prevent nail pull out??
There are several projects in San Francisco that used Epoxy/Fiberglass on very old unenforced masonry walls for Earthquake resistance. The coating was done mainly on the lower part of the wall and around penetrations.
The example in the program was the Woolen Mills Buildings.
RE: Epoxy Coating on OSB to prevent nail pull out??
This being said, I have seen many old brick walls (in Denver) damaged by freeze/thaw spalling due to Harry Homeowner applications of impervious paint.
This is off topic, but here's a link. BIA has a wonderful web site.
http://www.bia.org/html/frmset_thnt.htm
RE: Epoxy Coating on OSB to prevent nail pull out??
RE: Epoxy Coating on OSB to prevent nail pull out??
RE: Epoxy Coating on OSB to prevent nail pull out??
Just thought about this and am going to use it in my shop, especially at the corners.
http:/
RE: Epoxy Coating on OSB to prevent nail pull out??
I just had a lingering concern about the OSB sheating and its ability to hold a nail. It has not been tested for Cedar Shake applications ( as per the Cedar Shake and Shingle Bureau.) They only tested Plywood. It should be OK with OSB as it is widely used for Shakes as far as I can see. So I was looking for a fast and inexpensive way to strengthen the application.
RE: Epoxy Coating on OSB to prevent nail pull out??