Rockwool insulation gap

[Beachomatic]

New here and hey everyone. My wall is below grade concrete. Its not exactly true so I left a gap up to 2 inches in some places to accommodate a straight wall. The issue is that there will be a 2 inch gap from the rockwool to the drywall. I cant seem to find a consistant answer whether this will cause future moisture issues. Thoughts?

 

[manwithtools]

It should be fine. Any moisture issues would only come from outside the concrete wall or up from the floor below. Air is a pretty good insulator, between your foam boards and rockwool you should be in good shape.

 

[Beachomatic]

Appreciate the reply

 

[rlitman]

You're doing it right. I would suggest filling any gaps around that pink foam with spray foam. The pink foam, is already a vapor barrier by itself, but it needs to be sealed in place around the edges.

Is that a pressure treated sill (I hope so)? Gotta use hot dipped galvanized nails going into that.

 

[Hank11]

You're good to go.

 

[Stuart in MN]

I think you're okay, but you could add more insulation to take up the gap too.

 

[LWB]

It's fine. I'd leave it and intend on doing mine the same way.

ETA I'd would leave the gap between the Roxul and rigid board.

 

[jack stand]

^^^ x2. Leave the gap between the batts and foam.

 

[Metal-Marc]

Try not to compress the batts.

 

[mike93lx]

I think I'd install it tight to the drywall.

Also would use 2x6 insulation if there are a good amount of gaps like that

@Metal-Marc you cant really compress rockwool. It's already very dense

 

[Metal-Marc]

@Metal-Marc you cant really compress rockwool. It's already very dense

 

[Fav Onefour]

You're doing it right. I would suggest filling any gaps around that pink foam with spray foam. The pink foam, is already a vapor barrier by itself, but it needs to be sealed in place around the edges.

Is that a pressure treated sill (I hope so)? Gotta use hot dipped galvanized nails going into that.

Dang good advice.
To the bold comments. Don't forget sealing the top and bottom edges.

 

[mike93lx]

That won't hurt anything

 

[Metal-Marc]

That won't hurt anything

You did hurt my feelings.

 

[mike93lx]

You did hurt my feelings.

You'll bounce back

 

[Beachomatic]

Ok. Yea the floor plates are definitely pt. I did seal on the top and floor behind the foam board with the fire foam. Thanks all

 

[bluedog225]

If you have at least 3/4” gap (either side) , reflective barrier will keep heat in. Have to have the gap. Reflectivity or emissivity magic.

Would be good to know generally where you are in your profile.

 

[manwithtools]

If you have at least 3/4” gap (either side) , reflective barrier will keep heat in. Have to have the gap. Reflectivity or emissivity magic.

Would be good to know generally where you are in your profile.

This is on a below grade concrete wall, not much a reflective layer will do in this case.

 

[bluedog225]

It will keep heat inside in a cold climate.