MAPA Products, LLC Box 129 Naples, Texas 75568 Phone (903) 897-2371
Watts (877) 897-2371 Fax (903) 897-2781
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Recommended Installation Procedures:
Support Framing:
We strongly
recommend that prior to the installation of
this Roof mounted Pedestal Hydrant that a
field provided welded angle frame be
installed at the bottom surface of the roof
decking. This framing should be of
sufficient size to permit the provided under-
deck flange to slide freely yet firmly into the
frame and rest firmly against its top. The
framing should be of sufficient strength to
prevent any dislodging of the Hydrant
during normal operation. Refer to
Figure 1
.
Installation Sequencing:
We recommend that the Hydrant not be
installed until the roof decking and all roof
insulation is in place. A round hole should
be cut in the roof insulation and deck to
permit the hydrant to pass from the roof
surface through this opening to below the
roofline with the base resting squarely on
the insulation. We do not recommend
making final piping connections to the
Hydrant until all roof work associated with making the hydrant
base watertight to the roof is completed and then not until the
under-deck clamp has been installed.
Connections to the Water Source:
We recommend that a valve be installed on the
supply piping serving the hydrant. This valve should
be in a convenient and easily accessible location. In
order for the venturi to properly operate, we
recommend that the supply piping be minimum ¾”.
Optimal water pressure at the hydrant supply should
be 60 PSI (typical city water pressure), however it will
still operate properly at a minimum of 20 PSI.
Installation of the Hydrant:
A hole approximately
seven inches (7”) in diameter should be cut in the
roof decking. The hole should be centered on an
angle frame welded to the roof structure below the
decking. Once roof insulation is in place, cut through
the insulation and place the Hydrant base squarely
onto the roof surface. Square the Hydrant, pointing
the outlet nozzle in the desired direction.
Refer to
Figure 2
of the Instructions.
Caution should be taken to assure that the Hydrant is
vertically level above the roof. We do not
recommend installing the Hydrant within four feet of
the edge of the roof or within three feet of other roof
top equipment or on any sloping surfaces of the roof.
If recommended by the roofing manufacturer, holes
can be drilled along the outer edge of the flange to
permit anchoring of the hydrant to the roof membrane
prior to final flashing of the hydrant to the roofing
surface.