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Old 08-25-2013, 01:22 PM   #1
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repairing rotten trim and plywood above garage


There was one piece of trim above our garage that was starting to rot in the last few years. We decided to take it down to replace today and the plywood behind it is sogging wet in some places and rotten in others. A neighbor said the builder didn't put flashing in this spot so that's why it happened. Gah! So, can we fix this ourselves or is this a huge job? I assume we have to replace the plywood too. Would we have to take off the siding to get to the whole pieces of plywood? Or could the plywood be cut with a router and replaced in just the visible areas? Hopefully these pictures help.

(I posted this in General Discussion intitally not realizing there were subcategories.)
There was one piece of trim above our garage that was starting to rot in the last few years. We decided to take it down to replace today and the plywood behind it is sogging wet in some places and rotten in others. A neighbor said the builder didn't put flashing in this spot so that's why it happened. Gah! So, can we fix this ourselves or is this a huge job? I assume we have to replace the plywood too. Would we have to take off the siding to get to the whole pieces of plywood? Or could the plywood be cut with a router and replaced in just the visible areas? Hopefully these pictures help.
Attached Thumbnails
repairing rotten trim and plywood above garage-img_20130825_130406.jpg   repairing rotten trim and plywood above garage-img_20130825_130437.jpg   repairing rotten trim and plywood above garage-img_20130825_130445.jpg   repairing rotten trim and plywood above garage-img_20130825_130452.jpg   repairing rotten trim and plywood above garage-img_20130825_130727.jpg  

repairing rotten trim and plywood above garage-img_20130825_130406.jpg   repairing rotten trim and plywood above garage-img_20130825_130437.jpg   repairing rotten trim and plywood above garage-img_20130825_130445.jpg   repairing rotten trim and plywood above garage-img_20130825_130452.jpg   repairing rotten trim and plywood above garage-img_20130825_130727.jpg  


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Old 08-25-2013, 01:43 PM   #2
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repairing rotten trim and plywood above garage


Hard to tell just how bad it really is from those pictures.
From what I can see they installed the trim wrong above brick molding.
There should have been Z molding above and below it to deflect the water away from the wall.
Looks like there's no house wrap, which was a huge mistake.
The trim also did not stick out far enough so the brick molding was sticking out to far and water was just getting in behind it.
If it was mine I would just replace all the exposed wood and replace it all with vinyl lumber and trim and add the proper flashing this time.
A router would never be the proper tool for this job.
Depending on just how bad the OSB is your going to have to remove the trim and the siding to see just how far it's rotted
You never want to use a narrow strip to do the repair, to narrow and it's near impossible to drive a nail in it to install the siding and trim unless you can hit a stud

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Old 08-25-2013, 01:48 PM   #3
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Merged threads/post.
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Old 08-25-2013, 04:10 PM   #4
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Seeing no house wrap on what you did expose is very concerning. Your next step should be to unzip a panel above the trim to see what what things look like. If there's no housewrap behind the siding then you have bigger issues.
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Old 08-25-2013, 04:28 PM   #5
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No Z molding, trim board not setting out far enough so the brick molding was sticking out to far and water was getting in behind it, wood brick molding instead of vinyl.
And no a router is not the right tools for this. Going to have to remove that trim and some siding to check how bad it is.
If you do have to cut some of the rot out you want to remove at least a 24" wide piece.
Trying to nail a narrow pieces is a real pain.
I'd at least add house wrap or storm and ice shield to prevent future damage.
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Old 08-25-2013, 08:37 PM   #6
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We looked at our home purchase documents and apparently this builder (Midland Homes now Veridian) does wood sheathing and does not wrap the house. DH looked it up and it's not code here. So, that is why there is nothing there. Too bad they screwed up the installation on that trim because now we have a big problem.

What is OSB?
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Old 08-25-2013, 09:22 PM   #7
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It's what you referred to as plywood.
There is no plywood in any of your pictures.
OSB = Oriented strand board
I'm not seeing a big issue looks like a one day job to me.
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Old 09-22-2013, 08:13 AM   #8
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We are getting ready to repair this today. DH took off all of the siding. The bottom of the OSB needs to be replaced. It's rotted and crumbling. DH read to cut and replace 24" of the OSB with plywood, not OSB, and to tape the seams with siding tape. Does that sound ok? The OSB is 8 feet tall and we don't need to replace the upper portions as they are fine.
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Old 09-22-2013, 08:25 AM   #9
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You don't tape the sheathing seams. OSB vs plywood is a debate all in it's own, I use plywood most of the time.

Now that you have the siding off post another picture standing back so we can see the entire area please.
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Old 09-22-2013, 12:48 PM   #10
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Quote:
Originally Posted by abacker View Post
A neighbor said the builder didn't put flashing in this spot so that's why it happened.
And did that neighbor say what it took to repair their problem?

A router isn't the right tool for cutting off the old damaged portion. Use a circular saw for this. Set the depth to that of the panel you're removing.

Yeah, you don't tape seams. You'd use house wrap, done properly it'd be all the way down from the top.

The bigger question here is how did the water get in there? And what about your new repairs is going to prevent that from happening again?
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Old 09-22-2013, 02:37 PM   #11
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repairing rotten trim and plywood above garage


The neighbor's house didn't have the same problem they just knew a little about what caused it.

PP said no Z molding caused the problem.

Here is a new picture. DH has started removing rotten piece of OSB with sawz all and a hammer.

I'm not sure why there is water damage up around the shutters. Did they miss a piece molding/flashing there too?
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Old 09-22-2013, 02:40 PM   #12
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repairing rotten trim and plywood above garage


There's water damage up there because the builder missed the whole danged wall! You're at an 'in for a penny, in for a pound' situation.

At this point you might as well remove all that siding and put up some proper wrap and tape around the windows. Otherwise the new sheathing being put up will just fail the same way.
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Old 09-22-2013, 02:53 PM   #13
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This builder doesn't wrap houses, just does wood sheathing. So, the whole house isn't wrapped.

What do you mean the builder missed the whole darn thing? Did you mean the wrap?
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Old 09-22-2013, 03:10 PM   #14
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This builder doesn't wrap houses, just does wood sheathing. So, the whole house isn't wrapped. What do you mean the builder missed the whole darn thing? Did you mean the wrap?
Yes, the wrap. Around here they require it, partially due to whole developments running into the same sort of problem you have on your house.
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Old 09-22-2013, 03:25 PM   #15
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repairing rotten trim and plywood above garage


Makes you wonder whats going on behind the remaining exterior walls of the home.

Boy that house wrap sure is exspensive

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