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Old 05-28-2012, 10:09 AM   #1
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can i instal hardy board over foil faced polysio sheathinh

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Old 05-28-2012, 10:10 AM   #2
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can hardy board be installed over foil faced polyiso sheathing

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Old 05-28-2012, 11:13 AM   #3
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yes,but a drainage space is recommended in cold climates where there is no interior vapor barrier


see pg 3

http://www.jameshardie.com/pdf/USTB_...s-Hardie-2.pdf
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Old 05-28-2012, 03:13 PM   #4
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Foil-faced f.b. is recommended for a hot humid climate, pp. 5: http://www.buildingscience.com/docum...ting-sheathing

Your location makes a huge difference on foamboard thickness, rainscreen or not, faced or not, etc.....

Gary
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Old 05-28-2012, 05:22 PM   #5
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Rainscreen wall designs are preferable regardless of climate region in my opinion.

+1 to a foil faced FB in hot humid climates on the exterior wall.
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Old 05-29-2012, 07:31 PM   #6
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Quote:
Originally Posted by GBR in WA View Post
Foil-faced f.b. is recommended for a hot humid climate, pp. 5: http://www.buildingscience.com/docum...ting-sheathing

Your location makes a huge difference on foamboard thickness, rainscreen or not, faced or not, etc.....

Gary

question was can hardie be installed over foil face polyiso,hardie says yes with the following stipulation
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Old 05-29-2012, 07:40 PM   #7
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you tell them mr struble
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Old 05-31-2012, 01:42 AM   #8
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As Hardie defines where/how to install their product, it may be helpful to ask where a new member lives for insulation guidance or discussion, eg. no faced f.b. in a cold climate with poly sheeting already installed on the interior under drywall.......(the dreaded) two vapor barriers. Since foil-faced was posted, I presume a colder climate..... though I've been wrong before!

On a side note; A "rainscreen" system is not needed in a hot-dry or mixed-dry according to building science, page 5 (again) the lower map titled "Exposure" (blue shades) in my post #4 link.

Under 20" annual rainfall locations wouldn't benefit enough to pay for it (in my opinion), another map to only 16": http://maps.howstuffworks.com/united...infall-map.htm

only "where it rains"; http://www.buildingscience.com/docum...and-air-spaces

Gary

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