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Old 10-26-2007, 10:31 PM   #1
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Replacing Rotten Sill Plate


I was wondering how to properly repair/replace a section of rotten sill plate.

I had a shower stall along an exterior wall that was installed improperly. I didn't find the issue until I went to remove some wallpaper in the bathroom for a small paint upgrade. In the process of removing the wall paper found that there was mold in the wall. Then dug deeper and found a whole lot of buried past large water problems (it is amazing what Kilz will cover up) from the previous owner. The house was built is 1963 and the sill plate is not PT so it rotted completely along with some interior walls in the area. Well now the entire area is down to only exterior wall studs.

The problem with the sill plate issue is that the bottom 4-6 inches of the wall studs in that vicinity are also rotten. Can I remove the rotten sill and wall stud section and piece in a double stack of 4x4 to take up the space or would i need to replace with a 2x4 sill along with maybe splicing 3' sections onto the wall studs? Or would I have to replace the entire wall studs? The framing above the area has a continuous double 2x8 header sitting on top of a 2x4 stud wall. In other words the area has not shown any signs of failure or stress as the area in question is a 6 foot section of sill that it is spanning.

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Old 10-26-2007, 11:02 PM   #2
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Replacing Rotten Sill Plate


If this is a load bearing wall, you will need to set up a temporary wall to hold up the joists that are resting on this wall.
Take a sawzall and cut the bottoms of the studs free of the sillplate. Go up the studs to good wood and cut the bad wood off. Make the cuts as square as you can. Cut the two ends of the sill plate free and remove it. Install the new plate. Cut pieces of 2x4's to fill in the pieces you cut off. Take new 2x4's and sister each stud that was cut. If you can nail the new studs to the sheathing, do it. Otherwise apply construction adhesive to the stud where they contact the sheathing.
Ron

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Old 10-27-2007, 06:11 AM   #3
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Replacing Rotten Sill Plate


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Originally Posted by Material Tester View Post
.... Can I remove the rotten sill and wall stud section and piece in a double stack of 4x4 to take up the space or would i need to replace with a 2x4 sill along with maybe splicing 3' sections onto the wall studs? Or would I have to replace the entire wall studs? The framing above the area has a continuous double 2x8 header sitting on top of a 2x4 stud wall...
If you can, replace everything with materials that were originally installed, with the exception of using PT in locations where you are in contact with concrete. 2x4's rather than 4x4 allows you to install the sections very tightly nailed together. (Each piece nailed tightly into the connecting members, also nailed tightly together, also properly attached to the foundation .... not really possible with one large 4x4 section -in the particular type of repair that you are speaking about).
Also, I can see that you mention a header, if the area that you are replacing sits underneath that header and the sections being removed are between the jacks that support that header, and the header is truly supporting that area (exterior wall) that you want to work on, you may be alright. However, I cannot say for sure that you would be allset, as I cannot physically see the area. If in doubt, do as Ron posted and build a temp wall. Simple to do.

Good luck.
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Old 10-28-2007, 02:17 PM   #4
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Replacing Rotten Sill Plate


Thanks Ron and Atlantic,

When I sister new 2x4's to the wall studs about how long should they be? I had stated that I was thinking of using 3' sections but justed wanted to be sure that was acceptable. Assume approximately 8" of the wall stud has been removed to get to good wood. Is there a typical rule when splicing wood members based upon the size of the piece being spliced?

Thanks again for the help.
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Old 10-28-2007, 03:06 PM   #5
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Replacing Rotten Sill Plate


Since the new sister stud will not be attached to the sheathing in the traditional manner of nailing through the sheathing, but by being attached to the original stud(which is attached to the sheathing )you would want to remove as little as possible of the original stud. Take out the rotted sections and the soft "punk" wood above. You want to compromise the structure as little as possible.
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Old 03-28-2011, 12:23 PM   #6
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Replacing Rotten Sill Plate


how do I replace a rotten sill plate and sister in new floor joists that are also rotten on the ends ?
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Old 03-28-2011, 08:08 PM   #7
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Replacing Rotten Sill Plate


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how do I replace a rotten sill plate and sister in new floor joists that are also rotten on the ends ?
You jack up the house and cut out the bad wood.
And then you unjack the house,
Ron

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