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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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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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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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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.

DM
 

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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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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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