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I have a contractor currently replacing our cardboard (practically) siding with Hardiplank. He is intalling the new siding directly to the studs after attaching the Dupont barrier.

Should there also be plywood or some other supportive barrier? We live near Houston, Texas so heat, humidity and critters are a concern.

Thanks in advance!

Blessings!

Shari
 

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Next Time...New Build
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I can only speak for my northeast experience, but all siding I have ever installed, including Hardiplank, has been over exterior sheathing. I would not want the plank to span the stud cavities without something solid behind it. That stuff is way too flexible IMO to do that.

Not sure what the mfg instructions state, but seems to me that there should be some backer for installation. One of the pro siders should be along to help you out better.
 

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Check the manufacturer's instructions/warranty info -
It may invalidate the warranty!
(Some type of "house-wrap" is required)

Regards!

rosfingal
 

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A "Handy Husband"
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The sheathing provides structural integrity to the building. It prevent racking and ties all the framing together (the bottom plate to the studs and the studs to the top plate). Stop the job and get the building inspector involved it the contractor is a jerk.
 

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Framing Contractor
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I have a contractor currently replacing our cardboard (practically) siding with Hardiplank. He is intalling the new siding directly to the studs after attaching the Dupont barrier.

Should there also be plywood or some other supportive barrier? We live near Houston, Texas so heat, humidity and critters are a concern.

Thanks in advance!

Blessings!

Shari
This has to be a joke. Unless it's a shed.
 

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Fig.301.2(4), halfway down the page.
Appears you are in the 120-130 mph wind Zone here; http://publicecodes.citation.com/icod/irc/2009/icod_irc_2009_3_sec001_par004.htm

You should at least be building to this; http://www.awc.org/pdf/WFCM_90-B-Guide.pdf

The existing (hopefully) let-in braces are far to weak for your area, though may be acceptable for local Code, ask your Building Department. http://bct.nrc.umass.edu/index.php/publications/by-title/insulating-on-the-outside/

Perhaps there was shiny cardboard under the siding- called Thermo-ply- it is structural, I stopped installing that in the ‘80’s; http://www.berryplasticsbpg.com/products.aspx?page=thermo-ply

And, welcome to the forum!

Gary
 
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