Termites and subsurface foam insulation
I am in zone 4a.
I had planned to install sub-slab insulation to prevent condensation on the shop floor in this very humid area and a cool floor.
I also planned to add radiant heat. As I age some, I really have more appreciation of a comfortable working environment.
However, Nashville area is considered high risk termite location and we are near the very high risk zone to our south.
I have found nothing good when reading up on insects and protection of subsurface foam.
I wanted to use 2″ of reclaimed High Density EPS or XPS under my slab, but I have a lack of confidence. Since I am trying to economically apply good building practices, is there any helpful advice on the topic?
Perhaps preplaced tubing for a periodic insecticide treatment would be a good solution?
Thanks for you advice.
-Mike
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Replies
Hi Mike,
Three options come to mind:
1. Borate treated EPS.
2. High density mineral will "boards"
3. Foamglas "glavel"
Is the slab load bearing? If not, I wouldn't worry too much. Borate treated EPS shouldn't cost too much though for cheap insurance. Rigid mineral wool and Glavel are more expensive but I doubt the termites will eat steel slag and glass.
These are your safest options.