DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Roofing and Siding > Under siding--OSB vs Ply?




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Old 09-08-2008, 04:14 PM  
TaskBoy
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Default Under siding--OSB vs Ply?

I want to install a sheet under the Hardiplank siding--which is better OSB or Etx. Ply? What about cost diff? Thanks.



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Old 09-08-2008, 04:39 PM  
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OSB will be more affordable and is pretty much what all the new builds are made w/.



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Old 09-09-2008, 07:17 PM  
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Hello TaskBoy:
OSB is more eco-friendly too because it uses all of the log; there are no slabs cut off. I recommend it for the green effect.
Glenn

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Old 09-10-2008, 12:14 AM  
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Hello TaskBoy:
OSB is more eco-friendly too because it uses all of the log; there are no slabs cut off. I recommend it for the green effect.
Glenn
Hi Glenn, thanks for the green info. We are into supporting that if finances allow. Sounds like a good choice for us.
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Old 09-10-2008, 10:45 AM  
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OSB is OK but plywood is the more premium quality product in my opinion. Take a heavy hammer to a piece of OSB sheathing and you can easily punch a hole, not possible with plywood. OSB can also suck up water much more easily if it gets wet, especially at the edges. This is most pronounced under roof shingles. A swollen board wont cause a a big issue with hardiplank.

see
http://www.inspectorsjournal.com/forum/uploads/Erby/2007112452818_DSC03531.JPG
http://www.rd.com/familyhandyman/content/19557/
http://www.extremehowto.com/xh/graphics/articles/art_60280_rightrooflead.jpg

Trees do grow back and plywood is generally made from a fast growing tree crop planted especially for wood products after harvesting. OSB is generally cheaper than ply.

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Old 09-11-2008, 12:16 AM  
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One contractor I talked to today said he was going to go right on the studs with two layers of waterproof membrane under. Hardie's install sheet says you can go onto studs or onto 7/16 OSB--what would you folks recommend? Thanks.

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Old 09-11-2008, 05:34 AM  
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Last time I did hardieboard I did

Studs - 1/2" OSB - Tyvek - tape seams - Hardieboard

The stuff is rigid but not that rigid IMO.

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Old 09-13-2008, 11:26 AM  
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Default Add'l query...

I wanted to keep this related issue under the same thread...

If I put sheathing under the Hardieplank like OSB or ply, does the additional thickness now mess up french door mounting position or the measurements of the doors I'm to order/install. Or do I just get std. dimension (frame thickness) ones? Sorry but I am not familiar with how doors are installed (yet). What about the existing vinyl windows--will the siding stick out too far with sheath under? Thanks!

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Old 09-15-2008, 06:44 AM  
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No issues - The doors will install after the OSB and before the siding. I would think you would be messed up on any jambs on the inside without the OSB.

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Old 09-15-2008, 05:13 PM  
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No issues - The doors will install after the OSB and before the siding. I would think you would be messed up on any jambs on the inside without the OSB.
Thanks. What about existing vinyl windows with adding OSB or even just leaving the existing ply siding in place--too thick then?


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