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Hrose77 07-17-2011 02:25 AM

Sheathing
 
When I install the plywood sheathing do I put it right on the foundation or is it flush with the sill plate?

jklingel 07-18-2011 12:54 AM

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).

Ron6519 07-18-2011 06:07 AM

Quote:

Originally Posted by Hrose77 (Post 687717)
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.

Hrose77 07-18-2011 09:49 AM

I'm I'm extending down past the sill plate then do use a pressure treated strip so avoid rot?

DangerMouse 07-18-2011 10:21 AM

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

jklingel 07-18-2011 11:41 AM

Quote:

Originally Posted by Ron6519 (Post 688475)
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?

Ron6519 07-18-2011 03:52 PM

Quote:

Originally Posted by jklingel (Post 688683)
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.

Gary in WA 07-21-2011 03:35 PM

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


Gary


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