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(304.8 mm)

(228.6 mm)

(152.4 mm)

Tube Spacing

• Residential slabs will use 6" (152.4 mm), 9" (228.6 mm), or 12"

(304.8 mm) tube spacing with some perimeter banding. Banding is

any area where the tubing is installed with a tighter on center spacing.

Usually seen along exterior walls with higher than normal heat loss.

• Spacingwiderthan12"(304.8 mm) may produce unacceptable ﬂoor

temperature variations (striping). Tube spacing wider than 12" on

center is not recommended.

Fasteners

Tubing can be attached to either the rewire, rebar or below slab

insulation. The following can be used, depending on

installation requirements:

• Nylon CableTies—used to secure tubing to either rewire or rebar

12"-18" (304.8 mm - 425.2 mm) on center.

• FoamBoardStaplescanbeusedtosecuretubingdirectlytothe

horizontal board insulation below the slab.

Slab Proﬁle and General Details

InSlab-on-Gradeapplications,aminimumof2"-3"(50.8mm-76.2

mm) of concrete covering must be maintained above the tubing. More

coverage may be necessary depending on the structural requirements

of the slab.

Installation Steps

Manifold locations, final concrete

thickness and zoning details can

affect how a concrete application

is installed. The following

guidelines cover the most

common installation conditions.

If a given situation is not covered

here, or if unexpected

circumstances arise, please

contact Watts or a

heating professional.

1. Pre-Pour Conditions

• Verify all su/jointfilesconvert/543493/bgrade conditions

are properly prepared.

• Rewire or rebar are in place

and installed according to

design conditions.

• With orange spray paint, locate all interior walls and other obstacles

to be avoided, such as toilet areas, sewer drains, and any structural

supports that may penetrate the slab.

2. Install Manifolds

Locate where the manifolds are to be installed.

• Drive two pieces of rebar vertically into the ground. They may be

removed after the slab is poured and made ready for framing.

• Securethemanifoldswiththeuseofcabletiesorelectricaltape.

• Keepmanifoldshighenoughtoallowforthethicknessofthe

concrete, the interior wall base plate and other structural items

which may be installed after the pour.

Tube Spacing

Insulation Layer and/or

Vapor Barrier

Compacted

Su/jointfilesconvert/543493/bgrade

Typical Rewire Mesh

Slab Su/jointfilesconvert/543493/bgrade Detail

Manifold Pair

Temporary

Rebar

Supports

Slab - Manifold Installation Detail

1 2 3 4 5 6 7 8 9 10 ... 17 18

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