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sealing gap between stucco and foundation

16925 Views 2 Replies 3 Participants Last post by  Gary in WA
Found a lot of good articles from google and this forum about this topic, but most discussions or articles talk about workmanship and various codes. Can this gap be sealed?

Found a mouse in the house recently and after looking for points of entry I learned about these gaps and about stucco weep creed holes. From the attached pictures, I can see the weep hole, pink layer (must be the insulation), and wood frame.

I was thinking about putting in a wire mesh to keep rodents out and then spraying foam (like GREAT STUFF PESTBLOCK) to keep the bugs out. Can this be done if I keep the foam in the gap above the weep holes (i.e. try to keep foam >1/2" away from the bottom of the stucco layer like marked in attached picture)? Or must this gap be kept clear (e.g. for ventilation)?

Thank you in advance


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If you want to caulk between the sill plate and the foundation wall, you could do that.

I would not try to seal that area is you may impact the ability of water to drain out of the wall.
Welcome to the forum!

That gap appears to be caused when the framers moved the sill plate out past the foundation concrete wall. The round holes punched in the v (looking)-flashing are for drainage of the stucco itself. IMO, rodents would have a tough time getting in there (though mice can get through a 1/4" or so, hole) as the flashing is tight to the OSB sheathing and it appears to be tight to the mudsill plate, also- the holes are under the stucco material= no access. If you insist on foaming it, first install some continuous flat metal between the OSB and existing weep screed, extending down past the bottom edge of it (drip edge). The foam will give a tight seal then- and not interfere with drainage. The bottom edge design is really not required (two holes in last picture) required for drainage; Yours; (upside down-

Without the wider bottom detail, yet still functional as it still has the drip-edge;

PS. Look for other entry places as well; around electrical service, etc. Also; check in crawl/basement for ANY floor holes around plumbing/wiring, etc.
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