insulating radiant in house

[Kaizen]

Struggling with a path. I ran pex in several rooms using plates in the basement ceiling. Works great. I put r19 insulation in the cavity leaving a little air gap between insulation and aluminum mount plates. Its an old house and i always get mice. seems they love making nests in the insulation. eventually die from poison i leave out and the stench of death wafts through the floor.
Water temp is 110.
options i see are....
spray foam. concerned about heat burning the foam?
cut 2inch insulation and try and wedge up between joists. still will have a mouse house gap and will ****
1/2 inch insulation across the bottom of the joists. lots of pipes so almost impossible.
anyone been through this and have a good solution? again old house, rubble foundation, dirt floor. mice are the constant in this equation. dog would like to eat cats so cat is out.

 

[TractorJeff]

110 degree water will not burn the foam.
Spray foam seal!

 

[Firebrick43]

Some places require a fire barrier such as 5/8 drywall that taped to the bottom of the floor joist if you apply spray foam. Also if there is ever a leak and the sub floor is damaged you could have a nightmare.

Not trying to talk you out of spray foaming. Just informing. There is a real problem you have. Foam is a possible solution is just brings many down sides.

Is this a basement or crawl? I know it would cost some money but if a basement would it be possible to get a line pump hose down there and pour a floor and slip foam a 4" coat on the walls? Or even trowel a surface bond cement for a stucco like appearance.

Also check out the bucket mouse traps with a roller smeared with penitrations butter

 

[Raisedonadeere]

Penitrations butter?