Install Instructions

157

IM-PR 566442 1114 (Design Manual)

Appendix D In-Slab Systems

B.1 Introduction

In-slab systems are an excellent choice for garages, workshops, basements, thin-slab installations and

any other application where slabs are 10,000 ft

or less. For larger installations, consider specification of

Climate Mat.

B.2 Typical cross sections

Installers may select from a variety of fasteners when installing in-slab systems, including Rapid Grid,

Snap Panel, wire mesh clips, plastic zip ties, U-channels, plywood staples and foam staples. Typical cross

sections are shown below.

In-slab systems must maintain at least ¾" of concrete between the top of the tubing and the top of the

slab. If installing tubing in a thin-slab, the minimum depth of the slab must be at least 1½". Be sure to

coordinate with the person responsible for control cuts or joints to prevent tubing from being damaged

after the pour, if the tubing is to be set high in the slab.

4" Concrete Slab: Minimum ¾" height

of concrete over ViegaPEX Tubing

R-5 Edge Insulation:

Refer to local code for

insulation requirements.

Rapid Grid:

Check with local code to see if Rapid

Grid is an acceptable vapor barrier.

R-10 Insulation:

Please reference local code for minimum

insulation requirements. (Ensure compression

rating is suitable for application.)

Gravel

Compact Subgrade

9" Spacing (per design)

ViegaPEX Tubing

Figure B-1a

Section through slab on or below grade installation using Rapid Grid