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Old 07-17-2011, 03:25 AM   #1
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When I install the plywood sheathing do I put it right on the foundation or is it flush with the sill plate?

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Old 07-18-2011, 01:54 AM   #2
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Try not to contact concrete w/ wood, if untreated. Whatever you do, make sure you air seal either inside, outside, or both; that means caulking, EPDM gaskets, and/or taping (use non-hardening materials).

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Old 07-18-2011, 07:07 AM   #3
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When I install the plywood sheathing do I put it right on the foundation or is it flush with the sill plate?
The sill plate and rim joist should be in the same plane as the foundation edge. The plywood should extend down past the sill plate ( by an inch or so) to cover the sill plate concrete connection.
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Old 07-18-2011, 10:49 AM   #4
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I'm I'm extending down past the sill plate then do use a pressure treated strip so avoid rot?
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Old 07-18-2011, 11:21 AM   #5
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If the plywood is in contact with the concrete or ground, be sure it's not "just" pressure treated, but pressure treated FOR ground contact!
There IS a difference and inspectors can fail you if the proper material is not used and you will have to do it all again.

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Old 07-18-2011, 12:41 PM   #6
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The sill plate and rim joist should be in the same plane as the foundation edge. The plywood should extend down past the sill plate ( by an inch or so) to cover the sill plate concrete connection.
Ron: What is the need to extend the plywood if you have an EPDM gasket under the sill plate?
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Old 07-18-2011, 04:52 PM   #7
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Ron: What is the need to extend the plywood if you have an EPDM gasket under the sill plate?
It keeps wind driven rain from getting through. The poured foundations are sometimes a little wavier then the sill seal thickness. This allows air infiltration as well as water.
It also looks neater.
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Old 07-21-2011, 04:35 PM   #8
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Add a metal flashing under the sheathing as any contact with the concrete (moisture reservoir) wall could wick to the wood. Bad enough the p.t. mudsill contacts the sheathing without a capillary break; http://www.greenbuildingadvisor.com/...-building-code

Remember, #5; http://publicecodes.citation.com/ico...9_3_sec017.htm


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