Air sealing rim joist: am I doing this right?
Hi all –
Before I go doing all 40 floor joist/rim-board intersections, I thought I’d ask here: Does this look like a decent approach to air sealing this known-trouble-spot? In the worst of them, there is about a 1/16″ air gap (can see light through the crack marked “G”. In many/most of them, there is no visible crack.
I had considered taping from the exterior, but I’d go through hundreds of dollars of tape, and access is easier from inside (level slab vs. sloping muddy ground). That being said, it does seem like maybe it’d be wise and worth doing from the outside, depending on how many of these junctions need to be sealed.
I added letter-labels to this picture to make it easier to discuss.
I am using Tremco Dymonic 100 sealant.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part