I am getting ready to put exterior sheathing on my porch enclosure project. It is sheathed in plywood and tyvex. Do I just nail the T&G vertical boards directly to the surface of the tyvex and plywood? I do plan on painting all sides of the boards and caulking the grooves. By the way this is a 50 year old house that has existing T&G I need to match. Thanks in adance.
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Replies
nail to sheathing by putting the nails in the tongues so they are less likely to show. use galvanized nails or stainless steel.
But do NOT caulk the grooves. It will help lock moisture in to cause rot.
Excellence is its own reward!
Unless you have some blocking in your framing for nailing, I am afraid your plywood sheathing will not be sufficient to hold the nails over time, even if blind nailed through the toungue.
If it does not affect the existing plane of your house, I would reccommend using 1x nailing strips horizontal over the sheathing first. Nail these into your studs, minimum spacing @ 24". Then nail your vertical board siding into the nailing strips.
Like piffin says, do not caulk the grooves and remember to use flashing instead of relying on caulk where applicable.
Vertical siding is a tricky situation. Horizontal nailers would 'dam' any water that gets back there. I wonder if ring shank nails or screws would hold well enough in the plywood. They make those small SS square head finish screws. Not cheap, but could save a lot of trouble.
Also, I would want a rain screen design, particularly for vertical siding.
This would probably be a particularly good project for which to consider the new Benjamin Obdyke rain screen mesh material.
I have not used it, but I saw it at a builder's trade show, and on an addition going up nearby. Looks technically sound.
http://www.obdyke.com/html/products/slicker.html