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FlexGrass
Specifications
Playground Safety Surfacing
Manufacturer’s Specifications
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General
1.1 Section includes: Resilient playground surfacing
poured-in-place synthetic grass system.
1.2 Related work: Playground equipment and resilient playground
surfacing sub base.
1.3 Description: Provide all necessary materials, labor, tools
and equipment to perform the work included in the section for
the installation of the poured-in-place resilient playground
surfacing.
1.4 Quality Assurance: Manufacturer shall have manufactured and
installed playground poured-in-place synthetic grass safety
surfaces for a minimum of 5 years, and meet current ASTM
F-1292-99 Test Criteria. The installation of the poured-in-place
synthetic grass product shall be completed by FLEXGROUND, LLC.
Manufacturer's detailed installation procedures shall be
submitted to the Architect and made part of the Bid
Specifications.
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Submittals
2.1 Manufacturer’s Product Literature and Specification Data.
2.2 ASTM F1292-99 Impact Attenuation Test Certification for the
poured-in-place synthetic grass system to be installed in
compliance with the Critical Fall Height as determined by the
Playground Equipment to be installed in conjunction with the
poured-in-place synthetic grass surfacing system.
2.3 IPEMA Certification specific to poured-in-place rubber and
synthetic grass system.
2.4 Submit manufacturer’s written instructions for recommended
maintenance practices.
2.5 Samples for customer verification.
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Products
3.1 Product: FLEXGRASS poured-in-place synthetic grass system.
3.2 Description: A poured-in-place system with a synthetic grass
wearing layer upper membrane and an underlying impact
attenuation cushion layer. The finished surface shall be porous
and capable of being installed at varying thickness to comply
with Critical Fall Height requirements of playground equipment
installed in conjunction with the surface.
3.3
Urethane Primer: FLEXGRASS Primer is 100% solids
urethane
primer/sealer. It is designed with a low viscosity and
penetrating abilities makes this an ideal priming urethane.
3.4 Materials: Wearing surface-the FLEXGRASS synthetic grass
surface system shall be manufactured using
70 0z. Polyethylene with a pile height of 1.56”. Cushion
layer shall be recycled black ground SBR rubber particles (buffings)
mixed with 100% solids moisture cured polyurethane binder.
3.5 Cushion Course shall be a mixture of black recycled SBR
rubber buffings mixed with a 100% solids moisture cured MDI
Polyurethane binder (100 pounds of SBR rubber buffings to 12 lbs
of binder) installed at the appropriate thickness. The cushion
layer shall be porous.
3.6 Wearing surface shall be manufactured using a 70%
monofilament PE and 30% KDKPE root zone. Pile height shall be
1.56” thick. Primary backing shall be a stabilized dual layered
woven polypropylene with a DuraFlo secondary backing. Face
weight of synthetic grass shall be 70 oz/sq. yd. with a total
weight of 83 oz/ sq. yd. Infill shall be Gravity Max spread at
2lbs per sq/ft.
3.7 Finish Texture: Slip resistant
smooth and even.
4.Site Preparation
4.1 Site Elevation: For an on grade installation, the finished
height of the FLEXGRASS surface will be equal to or slightly higher
than the perimeter grade but not more than one inch higher unless
approved by the project engineer. An above grade installation will
usually require the use of transition ramps around the perimeters of
the area to transit smoothly back to the floor elevation, unless the
site terminates at a wall or other vertical surface. For site
drainage, when preparing a new hard base, a minimum slope of one
inch per ten feet of run should be applied to the finished surface
with slope toward the drain basin, drain trough, or down grade of
the site. Since FLEXGRASS surfaces are permeable, base drainage must
be provided at the slab or floor level for below ground
installations.
4.2 Hard Base Construction: For concrete surfaces, shot blast, acid
etch or power scarify as required to obtain optimum bond of the
Cushion Layer to the concrete. Remove sufficient material to provide
a sound surface, free of glaze, efflorescence, or form release
agents. Remove grease, oil, and other penetrating contaminants.
Concrete will have a pitch of 0.25 inches per foot and should not
have low areas that will hold water under the system. Asphalt shall
maintain a slope of at least 0.25 inches per foot and should not
have low areas that will hold water under the system. For compacted
loose base, the base should be constructed of 4 inches of compacted
abc compacted to 95%. .
Installation
5.1 Materials: Mix resin components and prepare material
according to manufacturer’s instructions.
5.2 Forms: If forms are required, following the shape of the area,
form the perimeter with six by six-wooden planks or railroad ties
flush with the surrounding ground area for flush installations.
Secure the planks with metal pins through the planks deep enough
into the ground to ensure the planks won’t move.
5.3 Primer Application: UrethanePrimer to concrete, asphalt or wood
surfaces at a rate of 200-250 square feet per gallon. Do not prime
the whole area at once, prime about 700 square feet and as the
installers approach an unprimed area, prime 700 more square feet.
5.4 Base Application: Mix two 50 lb. bags of SBR buffings with 12
lbs of MDI moisture cure Polyurethane binder thoroughly so that
binder is evenly dispersed into the rubber base. Spread and trowel
the mix to the desired depth and allow curing for 24 hours.
5.5 Synthetic grass Application: Roll the synthetic turf surface out
on top of your constructed based, as planned. If the site requires
multiple roll widths, be sure to have the grain of the fibers on
each roll of turf running in the same direction.
If seaming is required (multiple roll
widths), trim the selvedge (un-tufted edge) off of one roll and lay
it on the base, in the desired position. Lay the next roll adjacent
to the first and overlap one edge of the adjacent roll of turf on
top of the trimmed edge of the first roll. With scissors or razor
knife, trim the overlapped roll to match the trimmed edge of the
first roll. Make all cuts as close as possible without touching.
Repeat as needed for as many roll widths as the job requires. Around
the borders, trim the turf to match the edges. If a secured or
fastened edge is desired, do not secure the edge until most of the
infill is installed. In synthetic lawn applications, a drop spreader
(commonly used to spread grass seed, fertilizer, lime, etc.) should
be used to spread the infill in lifts ranging from to no greater
than half and inch (½") depths. In between the spreading of lifts or
layers, the fibers should be brushed upright with a plastic bristle
industrial broom or a power-broom. This keeps all of the grass
fibers erect and exposed. Fibers trapped underneath the infill may
not ever be recovered. Do not use stiff steel bristle brooms that
can damage the fiber. Be sure not to pour the infill in large
quantities on the synthetic turf. It is easier to work the fill in
with smaller quantity sizes placed in the turf. If the borders or
edges are to be secured, save the infill installation for these
areas for last. Repeat the infill spread / fiber brooming process
until the infill is evenly spread such that no more than
three-fourths of an inch (¾") of grass fiber tips are exposed above
the level of the infill. A good rule of thumb is two (2) pounds per
square foot.
Caution: Too much fiber exposed (not
enough infill) will cause the fibers to mat or crush with heavy foot
traffic. This will lead to premature wearing of the fiber and will
void any manufacturer's warranty.
5.6 Curing, Protection, and Cleaning: Cure according to
manufacturer’s directions, taking care to prevent contamination
during application stages and before completing the curing process.
Close application area for at least 24 hours.
6. Cleaning and Demonstration
6.1 Contractor shall clean the jobsite of excess materials and if
necessary backfill any excavation around the perimeter with earth or
other appropriate fill material.
6.2 The contractor shall instruct the owner's personnel on proper
maintenance and repair of the FLEXGRASS safety surface.
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