Install Instructions

IM-PR 566442 1114 (Design Manual)
168
B.5 Installation
Step 1. Installing the insulation
Ensure that adequate insulation is installed under the slab and at the perimeter, as required based on
the job’s climate zone. See Section 2.2 for residential recommendations and Section 3.2 for commercial
recommendations. When using foam board to insulate under slabs, weigh down the boards to prevent
wind uplift. In some jobs this can be done by installing wire mesh as soon as foam boards are placed.
Step 2. Installing the tubing
Fasten tubing every two feet and three times at each U-turn to hold down any return bends or other
shapes created. It is helpful to mark out portions of each circuit directly on the insulation using spray paint.
Cross-sections of tubing protection methods at control and expansion joints in concrete may be found in
Section 4.1.2, Handling and protecting tubing.
The return bend can have a
key hole shape to minimize
the tube spacing without
kinking the tubing.
Use bend supports in concrete.
A bend support will help reduce
possible damage to the tubing
due to the different expansion
and contraction rates of
different materials.
Figure B-3