Jim, thank you for your question. One of the greatest benefits of the STEP Warmfloor product is its versatility and ease of installation. Installing the product between joists is not a problem. You can staple the heating elements under the floorboards; the elements are one foot wide and fit between the joists. Do not puncture the bus braids on each side of the element. Since heat is transmitted by conduction rather than radiation, it is very important to place insulation snug under the heating elements with no air gaps to force the heat up.
We do free quote requests (
http://www.warmfloor.com/content/view/44/77/), and I would suggest sending us your dimensions so we can get started on your project.
