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Old 11-13-2012, 02:55 PM   #1
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Replacing siding - question about vapor barrier

Hi - I'm replacing some old and rotten particle board based lap siding with hardiplank lap siding.

I'm afraid that when I remove the old siding, I will find that either the vapor (water?) barrier is not there, or is damaged, so I plan on putting some house wrap behind the new hardiplank siding.

The question(s) I have are:

1) This portion of the house that I am starting on has wood trim on all corners -- How is the house wrap handled (attached) in the corners (and / or when it buts up against the trim?)

- Is there something that needs to go down at the junction of the house wrap and the trim to make that seam water tight?

2) Where the hardiplank boards meet each other (butt joints) do they require some sort of flashing or material behind the joint?

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Old 11-13-2012, 03:05 PM   #2
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You need to be going on the James Hardee web site and down loading the install instrutions.
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Old 11-13-2012, 03:40 PM   #3
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Joe Caption is correct, best thing is to consult the JH installation guide regarding the joints. Many contractors will simply caulk the butt joint, however JH released a tech bulletin stating that this was not acceptable, and not warrantied. Your butt-joints need to be properly flashed. JH's site will show you the proper method. Regarding the housewrap, check with the manufacturer as they may have specific details on how they want their product seamed. The housewrap we carry recommends a 6" overlap and then seamed with an approved vapor tape. Tyvek housewrap installation calls for a min 6" overlap and then seamed with their tape. Make sure to properly flash any openings (windows and doors). We sell Henry BlueSkin in a 4" and 6" wide rolls, the contractors here love using it. Again, follow the manufacturers installation instructions. Like anything, if you install it wrong you WILL have issues down the road.
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Old 11-13-2012, 03:40 PM   #4
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Like Joe said...get the info from them....
Even if you are on the right track, you will still get run over if you just sit there.

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