Framing - sill plate

[asmith1923]

Just poured my floor. 4” 3500 psi over 4” gravel and 6mil poly. I need to start framing for my barndo, question…. For my sill plates, I’m assuming pressure treated but do I need to put a moisture barrier under it like that thin pink styrofoam stuff?

 

[duneslider]

The sill seal is for creating a better air seal between the board and concrete. If this is just for interior walls its probably not needed unless you are wanting to do a better job air sealing a room within the barndo. For example, when I frame basement walls I don't use sill seal.

 

[asmith1923]

Ah, didn’t consider air seal. Thank you. I’ll be liquid nailing the sills down cause I can’t shoot into the floor with my radiant in there. Not until I can turn it on and see the tubes anyway.

 

[duneslider]

Ah, didn’t consider air seal. Thank you. I’ll be liquid nailing the sills down cause I can’t shoot into the floor with my radiant in there. Not until I can turn it on and see the tubes anyway.

If you need the air sealing, you can just caulk the bottom plate to the floor and get a better seal anyway. The liquid nails may or may not give you a good seal, if that is even a concern for you.

 

[asmith1923]

Because liquid nail gets hard?

 

[duneslider]

Because liquid nail gets hard?

It is possible liquid nails if your beads are continuous will work but it isn't "designed" to be an air barrier. If you have enough of it down there I would think it would work pretty good.

 

[Sumboodie]

Sill seal also helps to keep the wood from rotting, even PT wood. Do a double sill if you can, it'll allow you to pull the drywall, OSB, etc up higher and still have a nailer. Keeps from it soaking water that way.

 

[brownbagg]

black plastic

 

[asmith1923]

Once I’m ready to put the wall covering on, I’ll put a thick bead of caulk at the sill concrete seam. That should do it.

 

[anomm701]

yes

 

[rebelranger]

Do not skimp in this area. Think about exterior water intrusion. What's the fall from the sill, for rain water? I recommend caulking, foam, and good flashing. You'll combat water intrusion under the sills if you don't do this right. Many threads on this exact issue.

 

[duneslider]

I'm pretty sure he is talking about interior walls inside a metal building. He has a post frame building that is already dried in. These walls are not what you would see as the exterior walls on a stick frame building.