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Old 09-10-2017, 12:39 PM   #1
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T-1-11 siding bottom rot repair. Need advice


There is some rotted t-1-11 on my mother's garage, It's all on the bottom 3" or so. Is there a small scale fix or should I cut horizontal and replace with a new t-1-11 strip or some type of 1x6 or other trim board with z flashing? Also it seems the last person installed a flashing on the bottom of one side, not even the whole side. Im thinking this is just holding moisture? Thanks.
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Old 09-10-2017, 12:51 PM   #2
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Re: T-1-11 siding bottom rot repair. Need advice


The only way to "fix" it is to remove it and reinstall a new sheet that isn't as close to the ground and has proper flashing on it.

If you are okay with a slightly different look, you can install some PVC trim board on the bottom after you cut back the measured amount (i.e. 3.5" for some 1" by 4" PVC) and install a proper Z-bar flashing up behind the bottom edge of the T1-11 prior to the installation of the PVC trim board.

Only issue is that you have to do it all the way around to look right.
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Old 09-10-2017, 01:23 PM   #3
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Originally Posted by Windows on Wash View Post
The only way to "fix" it is to remove it and reinstall a new sheet that isn't as close to the ground and has proper flashing on it.

If you are okay with a slightly different look, you can install some PVC trim board on the bottom after you cut back the measured amount (i.e. 3.5" for some 1" by 4" PVC) and install a proper Z-bar flashing up behind the bottom edge of the T1-11 prior to the installation of the PVC trim board.

Only issue is that you have to do it all the way around to look right.
The whole bottom will need to be done for the most part, but I seen a video on YouTube where they cut horizontal and applied caulking in between the top piece and new bottom strip they repaired, is this not a good way?
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Old 09-10-2017, 01:36 PM   #4
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Re: T-1-11 siding bottom rot repair. Need advice


As a painter, I've had to repair that T-111 many times using different methods. WOW's way works well as you just have to cut off the rot and then apply a trim board. PVC is great because it won't rot and can touch the ground without wicking up moisture. Wood is ok too, but you will want some sort of barrier underneath it where it hits the ground or it will rot in short order.

You can do it as you are planning to do, but, you still have to deal with the moisture problem at the bottom and the repair piece(s) you put in will rot just like what's happening now. The PVC trim idea is best in my humble opinion.

And, to be perfectly honest, T-111 is fairly cheap, so, removing the whole sheet is a good option too. Then you can replace it with engineered T-111 OR Fiber Cement T-111 which can be painted and won't rot.
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Old 09-10-2017, 05:12 PM   #5
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Re: T-1-11 siding bottom rot repair. Need advice


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Originally Posted by Shurley0714 View Post
The whole bottom will need to be done for the most part, but I seen a video on YouTube where they cut horizontal and applied caulking in between the top piece and new bottom strip they repaired, is this not a good way?
I wouldn't rely on caulking to keep it sealed! sooner or later the caulk will fail. Flashing is more/less maintenance free and works well.
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Old 09-10-2017, 10:12 PM   #6
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Re: T-1-11 siding bottom rot repair. Need advice


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Originally Posted by Shurley0714 View Post
The whole bottom will need to be done for the most part, but I seen a video on YouTube where they cut horizontal and applied caulking in between the top piece and new bottom strip they repaired, is this not a good way?
That would only be a stop-gap solution and leave you with the siding still down to the grade, which is the cause of the rot in the first place. I had a similar problem with my shed and rimmed it with 2x8 PT capped with flashing then new siding. I've changed the grade but if the PT rots in my lifetime I can unscrew and replace it. Also, painting or staining the sides and edges of your wood siding, not just the face, will help extend its life.
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Old 09-10-2017, 10:27 PM   #7
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Re: T-1-11 siding bottom rot repair. Need advice


I would use flashing tucked up behind the house wrap but not shoved up tight the the bottom of the siding, prime and paint the fresh saw cut to.
Buy material after cutting because you may find other problems with the framing and the best plans can be changed.
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Old 09-10-2017, 10:32 PM   #8
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Re: T-1-11 siding bottom rot repair. Need advice


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I would use flashing tucked up behind the house wrap but not shoved up tight the the bottom of the siding, prime and paint the fresh saw cut to.
Buy material after cutting because you may find other problems with the framing and the best plans can be changed.
Exactly what I encountered. I had to replace a bunch of studs that looked ok from the inside but were rotten on the siding side (no wrap or subwall - just siding on stud. It's been a PITA but easier and cheaper than tearing in all out, re-doing the pad, permits, yada, yada.
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Old 09-10-2017, 10:42 PM   #9
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Re: T-1-11 siding bottom rot repair. Need advice


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Exactly what I encountered. I had to replace a bunch of studs that looked ok from the inside but were rotten on the siding side (no wrap or subwall - just siding on stud. It's been a PITA but easier and cheaper than tearing in all out, re-doing the pad, permits, yada, yada.
We worked on a wall just above the roof of a church, inside the wall started 20 above stairs. to save the drywall inside we removed 4" of 2x6 studs and bottom plate and added new 2x4 bottom plate and new studs and saved the drywall inside.
The engineer had asked for the bottom 6" of sheeting replaced because it was swelled up.
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Old 09-14-2017, 06:46 PM   #10
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Thank you all for the advice. Pvc trim and z flashing sounds good because of how it got rotten in the first place, if I do replace the whole t-1-11 panel though I will look into the ones that don't rot or install flashing under the new panel.
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Old 09-14-2017, 07:15 PM   #11
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Re: T-1-11 siding bottom rot repair. Need advice


Note, too, you have 4" oc T1-11 and 8" oc wide RB&B simulated T1-11, so you have two animals to tame. I think the bottom trim board and z flashing will work just fine on both.
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Old 09-14-2017, 07:48 PM   #12
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Re: T-1-11 siding bottom rot repair. Need advice


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Originally Posted by Shurley0714 View Post
Thank you all for the advice. Pvc trim and z flashing sounds good because of how it got rotten in the first place
If you do this you should add blocking in between the studs so the siding has full perimeter nailing. This is important for two reasons.

1) if the bottom of the siding is only secured with a nail at each stud then soon the siding will become wavy due to lack of support.

2) if the siding is also the sheathing on the wall you'll lose shear strength since the sheet is no longer connecting the top and bottom plates.
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Old 09-15-2017, 03:11 AM   #13
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Quote:
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Quote:
Originally Posted by Shurley0714 View Post
Thank you all for the advice. Pvc trim and z flashing sounds good because of how it got rotten in the first place
If you do this you should add blocking in between the studs so the siding has full perimeter nailing. This is important for two reasons.

1) if the bottom of the siding is only secured with a nail at each stud then soon the siding will become wavy due to lack of support.

2) if the siding is also the sheathing on the wall you'll lose shear strength since the sheet is no longer connecting the top and bottom plates.
Not really sure how to block in between studs for this? So you're saying go in the garage and place 2x4's horizontal all the way around where the bottom of the siding will be after I place the pvc lumber and flashing? If so how often should nailing be?
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Old 09-15-2017, 04:09 AM   #14
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Re: T-1-11 siding bottom rot repair. Need advice


If I understand the question correctly, the siding and bottom trim would have an additional nail or two into the blocking. Install the blocking after you cut the bottom of the T-111 but before you add the flashing and PVC trim.
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Old 09-15-2017, 04:35 AM   #15
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Re: T-1-11 siding bottom rot repair. Need advice


Agree. Just cut 2x4's the width of your stud bays (usually 14 1/2"), and with the bottom portion of the siding off, insert the 2x4 up across the bottom of the dangling siding between bays and attach it with short decking screws, leaving half of it showing below the dangling siding. That way the top portion of the siding is supported across and the trim and bottom portion of new siding will be supported as well.
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