DIY - Spray Foam for Rim Joists

[MapleFarmer]

Good morning Mustachians,

We are in the process of repairing and restoring our 1908 row home's original hardwoods on the second floor, which had been covered over with carpet by a previous owner.  After removing a few rotten/cracked sections of the tongue and groove, we noticed some light coming in around the front and rear second floor rim joists, where small gaps exist in the exterior brick wall.  We would like to air seal this space without removing more of the flooring.  Our retrofit hvac flex duct also pass through this space.

Have any of you used slow-rise spray foam (whether from tiger, foam it green, or other sources)?  What are your thoughts on ease of use and application for this project?  Drywall (first floor ceiling) is screwed to the underside of the joists and the original hardwood tongue and groove is blind nailed to the top.  Once air-sealed with the foam, I would likely fill the remaining void between the rim joist and the next joist with blown cellulose.

I want to be careful to avoid wasting expensive foam, overfilling the void, and ensuring I foam the leaks around rim joist, rather than simply (partially) filling the void.  I would appreciate any guidance (tips or redirection, as necessary) you all are willing to offer.

Thanks!

[Roboturner]

replying for follow, in similar situation

[Miss Piggy]

We used the expanding spray foam to "seal" several visible holes/spaces where our basement walls meet the first floor/joists. The stuff does expand to fill the holes, but it won't expand where it's getting resistance (so it won't have the strength to push your drywall out). We did this at least 10 years ago, and it's still holding (basement is unfinished, so the stuff is still visible.)

I'm no expert. Looking forward to seeing others' comments.

[Fishindude]

I have a similar situation.  Old farm house on a field stone foundation, first floor level roughly 2' above the ground.   
We blew insulation into the stud cavities in the walls, however the rim joist and portion of rock foundation extending above grade had zero insulation.  Also like yours, lots of little gaps and things just not fitting real tight, leaking air, entry points for mice, etc.    I had a foam insulation contractor come in and spray foam from underside of floors, on inside face of rim joists, then on rock walls to about 2' below grade to seal everything up tight and to get some insulation in that area.   

They also embedded a heavy screen wire in the foam so that mice couldn't chew through the foam and still get in.  This isn't 100% foolproof, but it did help.   Seems like mice go with the territory in an old country home.

Can't really quantify the cost vs savings, but you can tell the place is a lot more weather tight, and the floors are warmer in the winter.   I'd recommend it.
Note - I doubt you could do a real good job like this do it yourself, as it requires some specialized spray foam equipment.

[MapleFarmer]

I have a similar situation.  Old farm house on a field stone foundation, first floor level roughly 2' above the ground.   
We blew insulation into the stud cavities in the walls, however the rim joist and portion of rock foundation extending above grade had zero insulation.  Also like yours, lots of little gaps and things just not fitting real tight, leaking air, entry points for mice, etc.    I had a foam insulation contractor come in and spray foam from underside of floors, on inside face of rim joists, then on rock walls to about 2' below grade to seal everything up tight and to get some insulation in that area.   

They also embedded a heavy screen wire in the foam so that mice couldn't chew through the foam and still get in.  This isn't 100% foolproof, but it did help.   Seems like mice go with the territory in an old country home.

Can't really quantify the cost vs savings, but you can tell the place is a lot more weather tight, and the floors are warmer in the winter.   I'd recommend it.
Note - I doubt you could do a real good job like this do it yourself, as it requires some specialized spray foam equipment.

Thank you for the input.  This is great to hear.
Here is an example of one kit I am considering.  Other brands have similar products at similar prices.  I agree that a contractor with better equipment could yield a better job, but hoping I might be able to do a decent job without hiring this out, given the price of labor in my neighborhood.
https://sprayfoamkit.com/products/slow-rise-spray-foam/foam-it-602-slow-rise-class-1-polyurethane-spray-foam-kit-detail/