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Termites and subsurface foam insulation

mikeysp | Posted in General Questions on

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

  1. Expert Member
    RICHARD EVANS | | #1

    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.

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