Replies

1. GBA Editor
   Brian Pontolilo | Jul 25, 2019 09:32am | #1

   Hey Joe,

   Are you asking about the seal between the foundation wall and the sill plate? If so, the main reason to use sill seal is to air seal, but it can also act as a capillary break. Even though your sill plate will be pressure treated, it can't hurt to keep it dry. I've also heard that some of the more robust products are helpful to keep the plate from deflecting as you bolt it to the foundation wall, which will likely have some irregularities.

   Or are you asking if it is important to bring your air barrier from the walls to the foundation? With a vented crawl, that doesn't seem like it would be necessary, but I'd need to see drawings of the details to know for sure.

2. 
   joenorm | Jul 25, 2019 10:33am | #2

   Hi Brian,

   I have sill seal already, this not what I'm asking about.

   I am referring to the air barrier coming down to the concrete. I am going to tape my plywood seems and am wondering if its necessary to bring it down to the concrete if I have a vented crawl. I suppose air could come through that area and into the wall if I don't.

1. GBA Editor
   Brian Pontolilo | Jul 25, 2019 10:57am | #3

   Joe,

   You can also caulk the sheathing to the sill plate. What are you planning to do to insulate and air seal the floor assembly and rim joist?