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Old 08-17-2011, 09:05 AM   #1
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housewrap - necessary?


I have a gable-roof shop that is frame-built atop a poured foundation. The walls studs are 2' apart. I have some water/dry rot on one gable end along the garage door header. There was not a good caulk seal and water got under the trim board and rotted the siding, sheathing, outside header, inner osb "sandwich" -- the inside header seems to be ok).

Sorry for the long story, but I noticed there is NO wrap on the gable end. This was built in 2005. I'm in NE KS. I don't know if this is common practice or what, but seems like in our wet, humid climate, wrap would be a good idea.

Thoughts?

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Old 08-17-2011, 11:30 AM   #2
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housewrap - necessary?


I'd put on some house wrap. It's not terribly expensive. Depending on your local codes, it may not be required for sheds and other outbuildings.

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Old 08-17-2011, 05:14 PM   #3
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a caulk seal will never work,get a metal drip cap over the trim
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Old 08-17-2011, 05:20 PM   #4
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Wrap is mandatory imo. If anyone tells you otherwise, fire them.
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Old 08-17-2011, 06:56 PM   #5
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All these siding types require a water-resistive barrier; http://publicecodes.citation.com/ico...003_par006.htm

UNLESS you meet the “Exceptions” listed, as post #2 touched on; http://publicecodes.citation.com/ico...003_par003.htm

It’s pretty cheap not to include any when building……. my 2 cents.

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Old 08-18-2011, 08:20 PM   #6
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If you do decide to put up housewrap make sure you use caps. Don't just staple or nail it on. Tyvek brand actually requires the use of caps or they won't warranty their product.
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Old 08-18-2011, 09:43 PM   #7
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perhaps more important, or as much, is a rain screen. vertical 1x4's over the
'Tyvek", then siding, for ex. 30 lb felt is a great wrb, too.
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Old 08-19-2011, 11:09 AM   #8
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If you do decide to put up housewrap make sure you use caps. Don't just staple or nail it on. Tyvek brand actually requires the use of caps or they won't warranty their product.
I've seen a lot of housewrap on both homes and commecial buildings. I have never, not even once, seen it put on with caps. Not Tyvek or any other brand.
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Old 08-19-2011, 12:21 PM   #9
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Quote:
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If you do decide to put up housewrap make sure you use caps. Don't just staple or nail it on. Tyvek brand actually requires the use of caps or they won't warranty their product.
Actually just did some investigating into tyvek "housewrap" and they permit the use of 1" crown staples as an approved fastening method. All of their commercial products require capped fasteners.

See Page 4, Step 3, 4th fastener type.
http://www2.dupont.com/Tyvek_Weather...WRB_K16282.pdf
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Old 08-19-2011, 12:23 PM   #10
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perhaps more important, or as much, is a rain screen. vertical 1x4's over the
'Tyvek", then siding, for ex. 30 lb felt is a great wrb, too.
The furring strips aren't allowed under vinyl siding. It requires a continuous substrate.
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Old 08-19-2011, 11:04 PM   #11
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this is what you want to use
Attached Thumbnails
housewrap - necessary?-0804111501.jpg   housewrap - necessary?-0804111502a.jpg   housewrap - necessary?-0804111505.jpg  
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Old 08-20-2011, 12:01 AM   #12
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Actually just did some investigating into tyvek "housewrap" and they permit the use of 1" crown staples as an approved fastening method. All of their commercial products require capped fasteners.

See Page 4, Step 3, 4th fastener type.
http://www2.dupont.com/Tyvek_Weather...WRB_K16282.pdf
My bad warranty doesn't require but it's much better than just a staple. Moisture barrier stuff is a big deal.
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Old 08-20-2011, 12:51 AM   #13
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The furring strips aren't allowed under vinyl siding. It requires a continuous substrate.
OK. Did not know. Is the "krinkle-wrap" stuff permitted?
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Old 08-20-2011, 11:15 AM   #14
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Not to worry, JK, as you never mentioned vinyl with a rainscreen- or the OP (water got under the trim board and rotted the siding,). Never seen vinyl siding rot from water.......

It appears a WRB isn't required in an outbuilding (shop) in KC? As you said "water behind the trim"--- as Tom Struble pointed out you need metal pan flashing over horizontal trim, not caulk alone.

Hardie lap boards don't need a WRB unless local codes require it, though I can't see it water damaged... hence a picture is needed, rather than guessing the siding type and trim placement.

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Old 08-20-2011, 01:17 PM   #15
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OK. Did not know. Is the "krinkle-wrap" stuff permitted?

yes it is,enhanced drainage is always a good idea but imo not really necessary with non foam adhered vinyl siding,i would recomend it on foam backed products

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