Post
by kurt333 » Mon Jun 17, 2019 3:04 pm
Thanks. Sounds good. Im right in there for starting height of window but really restrictive for sill height. But should be good. Un conventional.
Sheeting it now. I pulled off the old osb with a bit of rot, I need to cut some 3/4 pcs to match the old 3/4 ship lap.
Is there any point in removing all the 3/4 ship lap, the layer touching the walls studs framing etc?
I guess it provides another good layer or protection and base to nail into?
It doesnt look like 3/4 df ship lap likes to rot very easy if at all. But there is a few little spots that have termits or wood bugs got in it. I will maybe treat it quick with the copper stuff, green copper i think its called, maybe that helps. The wood is pretty brittle but solid stuff. I will throw a few screws in it here and there or some spiral nails.
I will then nail 1/2 osb to the 3/4 ship lap, and that will be it.
What nail size to mount the 1/2" osb to the 3/4 ship lap? I bought some 2.25 inch galvanized, and I think 2.5" spiral nails too, and have some 2" galvanized nails too.
They (APA) do recommend on the internet quite a few places to always gap your sheathing 1/8 inch, walls, roofing and floors etc. Lots of comments on guys never spacing leaving a gap, have never seen a problem in 30 years. But some guys say they have seen hundreds of houses with buckling showing up transfered to the roofing shingles or siding. Sounds like in open barn spaces some guys have problem, if they dont gap the sheathing, as all the moisture gets soaked up from barn hay and animals etc and expands the wood and it buckles. Just throwing that out there, as I did research it a bit on google and read all the articles on it. Sounds like spacing it with 1/8 nail is good. Says right on this osb sheets to leave 1/8 gap on all edges. Apparently the sheets of osb and maybe plywood, is sized 1/16 under 4 and 8 feet to account for this, spacing. Im not the expert, just saying what I have found. When I build my shop I will be gapping all sheathing for sure. I dont like the idea of the air coming through, but I guess the tar paper will stop that, and its good for ventilation maybe.