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Old 12-02-2012, 10:37 AM   #16
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R3 Rigid Foam for sheathing??


This link you sent me is quite interesting.

It says the use of a water resistive barrier is required. I just have foam board. Does that qualify, I would think not since there is 1/4 gap between each board. That is nowhere near water resistant.

It also says that nailing the siding directly to the studs is not allowed, according to a chart that outlines the wall covering. Nailing to the studs is the only way you would get the siding up since there is no plywood sheathing. This tells me the use of plywood sheathing is required, with a water resistive barrier on top.

I really wish I would have had the sense to pull back the vinyl siding before buying the house. Not sure if it would have prevented me from buying it though.

I really am not concerned with wall strength, bracing and all that since the house has been standing for close to 20 years and has withstood hurricane force winds.

I am just concerned about getting it waterproof or close to it, holding in heat better and getting the walls wrapped up properly to keep in warmth and water and cold out.

I guess my options are to remove all vinyl, put up plywood then housewrap and tape all seams or leave out the plywood and just housewrap the foam that is already up.

Then I am left with the task of trying to identify where all the nails can penetrate the house wrap into the studs since there is no freaking plywood behind it!

I also had such fun trying to nail up vinyl to the celotex in the attic, freaking nails just push through like thumbtacks with your hand, wind resistant, I think not!

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Old 12-02-2012, 10:51 AM   #17
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R3 Rigid Foam for sheathing??


I've been thinking about it and I have more issues. I cannot simply house wrap my house the way it is with the foam sheathing. That does not provide enough structure for nails/staples. I doubt the tape will hold the house wrap up on the foam for a long period of time. I would have to take down all the foam, replace with plywood and then wrap it.

What other option do I have? I'd like to leave the foam sheathing up as to save money vs buying plywood and putting that up. But how do I attach house wrap so it'll last? Nail it to the studs, that wouldn't work because the foam has a 1/4 gap between, the wrap would push into the gap.
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Old 12-02-2012, 06:38 PM   #18
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R3 Rigid Foam for sheathing??


I did more inspections today. Apparently all the corners are sheathed in plywood with the rest in foam board. When I pulled the front corners nearest the front brick veener I found gaps between the stud nearest the front and the next one on the opposing corner wall. I will insulate that with some insulation for now.

On another wall, there was a bunch of cardboard nailed up, not sure why, but it was in small pieces and I did not find anything weird behind it.

I also was able to find out for sure that some areas are sheathed in celotex, it actually had the branding on it. The attic area and the vinyl covered chimneys and the one uninsulated garage wall.

All of the vinyl siding is nailed to the studs.
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Old 12-02-2012, 08:09 PM   #19
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R3 Rigid Foam for sheathing??


The foam board acts as required backer for vinyl siding, you cannot fasten vinyl to ONLY bare studs. The corner sheathing/every 25' passed minimum code for your area. I started framing, installing Celotex in '73, very "now" then. It was structural with amount/length/spacing of proper fasteners. The foam shrinks (have a few other links in my library), that is a fact= hence the 1/4" gaps.

Remove/replace siding is pretty quick (number them on inside face), only problem is don't break any as replacement won't match the weathered look. Use some from the back/side of house for the new pieces, using old for more noticeable areas. Add the housewrap.

Remove siding and foam board, add housewrap with stapler to bare studs, add foam and siding. Wall #2, pp.13: http://www.buildingscience.com/docum...ting-sheathing

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Old 12-03-2012, 08:40 AM   #20
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R3 Rigid Foam for sheathing??


Thanks for the input. I appreciate all the help you guys have given me.

I think eventually I will strip the siding and then housewrap on top of the existing sheathing/rigid foam and then install the vinyl siding. I will have to attach the housewrap carefully using nails to the studs and tape, possibly staples to the foam with tape over top.

I would love to add a second layer of rigid foam all the way around but that proves costly and time consuming with windows and trying to meet the siding to the front brick veener. An extra layer would make the vinyl channel not meet with the brick veener. Maybe I will do it on the sides of the house with no windows.
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Old 12-03-2012, 04:42 PM   #21
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R3 Rigid Foam for sheathing??


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Originally Posted by iteach4jeeps View Post
I will have to attach the housewrap carefully using nails to the studs and tape, possibly staples to the foam with tape over top.
Why not just use dabs of construction adhesive here and there?
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Old 12-03-2012, 06:59 PM   #22
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R3 Rigid Foam for sheathing??


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Originally Posted by tylernt View Post
Why not just use dabs of construction adhesive here and there?

Solvents in a bunch of the construction adhesives with melt both the foam and the Tyvek.

You can use sealants and caulking, they just have to be compatible and most folks will find it easier to staple up or cap nail it.

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