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Thin Slab over Frame Floor Applications

• Most thin slab applications are installed during the initial construction

of a building, due to the increased structural requirements to carry the

added weight.

• Lightweight concrete products will increase the ﬂoor height by a

minimum of 1.5" (38.1 mm) and the ﬂoor load anywhere between

12 to 18 lbs/sq.ft (5.44 k to 8.16 k).

• Theincreaseinloadusuallymeansamodicationtothejoistsystem

and/or other supports.

• Verify a ﬂoor’s ability to withstand these loads prior to installing a

lightweight concrete product.

Tube Spacing

• Residential thin 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.

• Tubing is generally attached directly to the subﬂoor with the use of

staples and/or NailTites.

Fasteners

The sub-material the thin slab is installed over will determine how

the tubing can be attached. The most common sub-material is a

wooden subﬂoor.

• Staples—spacedevery18"-24"(457.2mm-609.6mm)oncenter.

Use a staple gun set to 100 psi.

Thin slab Proﬁle

• It is important to maintain at least 3/4" (19.1 mm) of thin slab material

above the tubing.

• More coverage may be necessary depending on the structural

requirements of the slab/structure.

Installation Steps

Manifoldlocations,nalconcretethickness,andzoningdetailsarejust

a few items that can affect how a thin slab 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. Install Manifolds

Locate where the manifolds are to be placed.

• With the use of Watts manifold brackets or manifold mounting

enclosure, secure the manifolds to the wall.

• Allowances may need to be made to allow the tubing to transfer

through the wall base plate and into the thin slab.

• Follow local code guidelines when penetrating framing base plates.

12" max

(304.8 mm)

Thin Slab Over Framed Cross Section

Thin Slab Tube Spacing

Thin Slab - Manifold Installation Detail

ThinSlab

SubFloor

Heating PEX or

Heating

PEX-AL-PEX

Insulation

Floor Covering

Mimimum 1-1/2"

(38.1mm)ThinSlab

Insulation

Manifold

ThinSlab

Heating PEX or

Heating

PEX-AL-PEX

Note: Local building or plumbing codes may require

modifications to the information provided. You

are required to consult the local building and

plumbing codes prior to installation. If this

information is not consistent with local building

or plumbing codes, the local codes should

be followed.

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