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Old 06-13-2012, 02:52 PM   #1
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Rotted wood under siding: Repair Help? (See Pictures)


Since I moved in to this levit house a year and a half ago(NY) I had new roof shingles and tar paper done, and a few other projects, so no leaks anymore (I think). Now, I'm looking at the siding, they're old asbestos shingles, all of which could use replacing, but have held up ok around the top of the house. The wood 1xs, and 2x4s, up underneath the bottom row of shingles, against the foundation, is half rotted around almsot the whole house. One really bad area, is a garage corner that met with a half-height outside wall in the front. Water and some ants over the years got to it pretty bad. I cut away a section of the outside wall, and a layer of 1xs on the garage corner. I can see now the the cluster of vertical 2x4's that makes up the corner support is also in bad shape.... Do I replace the old rotten 1x section with plywood? Also, do I replace the 3 vertical 2x4s with 3 new ones? or use a 4x6?

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Old 06-14-2012, 04:18 PM   #2
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Rotted wood under siding: Repair Help? (See Pictures)


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Originally Posted by LevTownMike View Post
Do I replace the old rotten 1x section with plywood? Also, do I replace the 3 vertical 2x4s with 3 new ones? or use a 4x6?
Yes, you could use 3/4" plywood to replace the 1X. I'd block between the studs though since the plywood needs more of a nailing surface than the 1X.

3 2x4's or 1 4x6? I'd say the choice is yours, just make sure the plate the framing is sitting on is pressure treated.

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Old 06-25-2012, 04:44 PM   #3
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Rotted wood under siding: Repair Help? (See Pictures)


Oh Boy!.........the extent is around all the house?
You have your work cut out for you then........but if you take a wall section at a time it isn't so bad.
If your intent is to replace the asbestos shingles, I would first decide on what your choice will be for siding.
If you know that most of the bottom plate is rotten, start by removing the bottom 2ft of shingles, then the 1x sheathing. Once you have it exposed, you will see the extent of the damage.
I'm in Florida and would use yellow pine 2x4's for studs and PT 2x4's for the plate. You can "Sister" the studs once you've cut out the damage, but you'll have to still expose enough of the old stud to be able to nail them together.
Use CDX sheathing that extends beyond the slab with a moisture barrier behind. If you remove more than 6 ft of wall you will need to give the roof a little temporary support. Florida codes are much different to NY so I'll leave you to check on that when it comes to strapping and sealing.
Post photos as you go so we can see what you're up to........we all love progress shots.

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Old 06-25-2012, 05:03 PM   #4
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Rotted wood under siding: Repair Help? (See Pictures)


A slab on grade is never a good thing.
There is no way to just remove the old siding and install sheathing that close to grade and have it work out.

There is a way around it but I'd suggest having a pro come in and take a look at the "bones" of the struture first.

If the main structure has failed there's little since in trying to just patch it up.

There is no replacement siding that looks like that to replace it to do just a patch job, all the siding will need to go, all the rotted boards need to go.
Al lthe rotted bottom plates need to be replaced with pressure treated lumber with silicone or constrution adhesive under them to help stop water from coming in, then add new sheathing sitting 1/2" up off the slab, cover the wall with Tyvek.
Add 5/4 vinyl lumber along the bottom of the wall set in a bed of silicone, add Z moulding on top of that, install new outside vinyl corners, then 5/8 J moulding on top of the Z moulding.
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