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Specifications |
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| Part
1 - General |
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Part
3 - Execution |
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| 1.1
Work Included |
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3.1
Inspection |
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The
scope of the work includes labor, materials,
equipment and performance of all work required for
installation of Poly-Grate II as suggested by
manufacturer’s drawings and installation procedures. |
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Proper
site preparation and ongoing maintenance will
determine performance. |
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3.2
Surface Conditions |
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Examine
concrete ledge, and/or existing tree pit to
receive grate. Correct condition to comply with
manufacturer’s recommended installation procedure. |
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| 1.2
Work by Others |
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Openings
to receive grates are to be provided by
others in accordance with instructions of tree grate
manufacturer and are indicated on drawings and
provisions of the specification. |
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3.3
Installation |
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A.
Opening to Receive Grate |
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1.
Concrete Ledge Supported - New Installation
(figure 3.3A1) Concrete ledge shall be cast in size
and configuration of specified tree grate model plus
3/8” expansion allotment. Ledge shall be 2 inches
below concrete or tiled surface and extend inward
2 to 3 inches. Ledge must be level and free of bulges
and slag. |
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| Part
2 - Product |
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2.1
Tree Grates |
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A.
Manufacturer |
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Grates
shall be Poly-Grate II, plastic tree grates
as manufactured by us. |
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2.
Angle Iron Frame Supported - Retro-fit
Installation (figure 3.3A2) When pouring sidewalk,
prepare smooth edges to accept lengths of 2” 90º
angle iron cut to specifications of grate size minus
5 inches (for 48” grate cut angle iron to 43”; for
60” grate cut angle iron to 55”). Sidewalk
preparation should allow 3/8” additional length
per side to provide for grate expansion. Attach angle
iron to sides of poured surface with Tap-Con
screws or other approved concrete fastener.
The angle iron support ledge should be placed 2”
below the surface of the concrete. |
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B.
Material |
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Grates
shall be of high-density polyethylene resins
conforming to ASTM D-638. |
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C.
Design |
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Grate
pattern shall comply with A.D.A. requirements
for equal access. Color, size, and configuration shall
be specified by owner/architect. |
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D.
Finish |
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B.
Support and Litter Prevention |
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Grates
shall be manufactured true to pattern, of
uniform quality and size, and free from defects.
Surface shall be smooth; free of sharp edges. |
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Fill
space from bottom of tree pit flush to bottom
of tree grate with pea rock, crushed shale or similar
aggregate. |
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| 2.2
Hardware |
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C.
Join Grate Halves |
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Fasteners
(included) |
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Bring
tree grate halves together around a tree at a
height that allows easy access to underside. Join
section at pre-formed holes using tamper-resistant
bolt package provided by manufacturer, or approved
equal. Lower grate into place. |
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Grate
halves shall be joined together with tamper-
resistant bolt package as provided by us. Package
to consist of (6) each #16 3/8” x 1-1/4” button head
socket-cap screw, stainless; #16 3/8” Tuff Nut,
brass; and (12) each 3/8” USS Flat washer, zinc. |
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TEST DATA |
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The
key to any successful landscape project is to
budget for ongoing maintenance expenditures, such as
grate expansion as your trees mature. For best results
and longevity, PolyGrate™ requires that the space
between the ground and tree grate bottom be filled with
course aggregate for all installation applications. This
will properly support the grate, prevent accumulation
of debris under grate and protect close-to-surface root
systems. |
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ASTM Test |
Units |
Typical Values |
| Resin Properties: |
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| Density |
D-1505 |
g/cc |
0.957 |
| Melt Index |
D-1238 |
g/10 min |
7 |
| Molded Properties: |
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| Tensile Modulus |
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| (1% Secant) |
D-638 |
psi |
166000 |
| Tensile at Yield |
D-638 |
psi |
4300 |
| Elongation at Break |
D-638 |
% |
1400 |
| Flexural Modulus |
D-790 |
psi |
194000 |
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