Grasspave2 Technical Specifications
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Grasspave2 Product Specification (CSI
Format)
Notes: This product guide specification is
written according to the Construction Specifications Institute (CSI) Format,
including MasterFormat (1995
Edition), SectionFormat, and PageFormat, contained in the CSI Manual of Practice.
The section must be carefully reviewed
and edited by the Engineer to meet the requirements of the project and local
building code. Coordinate with
other specification sections and the drawings.
Delete all "Specifier Notes"
when editing this section.
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SECTION 32 12 43
POROUS
FLEXIBLE PAVING
(Formerly 02795 Porous Paving)
Notes: This section covers Grasspave2 Porous
Pavement System from Invisible Structures. The system provides vehicular and heavy
load support over grass areas while protecting grass roots from harmful
effects of traffic.
The major components of the complete
system are the Grasspave2 units, an engineered base course, Hydrogrow soil
amendment/fertilizer, sand, and grass from seed, hydromulch, or sod.
Consult Invisible Structures, Inc. for
assistance in editing this section for the specific application.
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PART 1 GENERAL
1.1 SECTION
INCLUDES
A.
Porous pavement system.
1.2 RELATED
SECTIONS
A.
Section [31 20 00 – Earth Moving] [__ __ __ -
__________].
B.
Section [33 46 00 – Subdrainage] [__ __ __ -
__________].
C.
Section [32 10 00 – Bases, Ballasts, and Paving] [__ __
__ - __________].
Notes: Edit the following list as required
for the project. List other
sections with work directly related to the porous pavement system.
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D.
Section [32 30 00 - Site Improvements] [__ __ __ -
__________].
E.
Section [32 90 00 Planting] [__ __ __ - __________].
F.
Section [32 92 00 – Manufacturers of Turfs and
Grasses] [__ __ __ - __________].
G.
Section [32 80 00 – Irrigation or Section 32 84 13 – Drip Irrigation] [__ __ __ - __________].
1.3 REFERENCES
A.
ASTM F 1951-08 Standard Specification for Determination of
Accessibility of Surface Systems Under and Around Playground Equipment.
B.
ASTM D 638-10 Standard Test Method for
Tensile Properties of Plastics
C.
ASTM C 33 Standard Specification for
Concrete Aggregates
D.
AASHTO M6 Standard Specification for
Fine Aggregate for Hydraulic Cement Concrete
1.4 SYSTEM
DESCRIPTION
A.
The Grasspave2 porous pavement system provides vehicular and
pedestrian load support for grass areas, while protecting grass roots from
harmful effects of traffic.
B.
Major Components of the Complete System
1.
Grasspave2 units, assembled in rolls.
2.
Engineered sand and gravel base course.
3.
Hydrogrow soil amendment and fertilizer, supplied with
Grasspave2.
4.
Sand fill
or USGA greens mix.
5.
Selected grass
from seed, hydroseeding/hydro-mulching, or sod.
6.
Selected topsoil
(only for seeded installation).
7.
Mulch
(needed only for seeded or hydroseeded installations).
C.
The Grasspave2 grass paving units, sand, and base course
work together to support imposed loading.
D.
The Grasspave2 grass paving units, Hydrogrow, and sand fill
contribute to vegetation support.
1.5 SUBMITTALS
A.
Submit under provisions of Section 01 30 00.
B.
Shop Drawings: Submit
design detail showing proper cross-section.
C.
Samples: Submit
manufacturer's sample of Grasspave2 10” x 10” section of Grasspave2 material.
D.
Installation Instructions: Manufacturer’s printed
installation instructions. Include
methods for maintaining installed products.
E.
Certificates:
1.
Manufacturer signed certificate stating the product is made
in the USA.
2.
Submit Material Certificates for base course and sand (or
USGA mix) fill materials
3.
Product certificates signed by the manufacturer certifying
material compliance of polyethylene used to make Grasspave2 units.
4.
ISO Certificate certifying manufacturer’s quality management
system is currently registered to ISO 9001:2008 quality standards.
F.
LEED Submittals: Provide documentation of how the
requirements of Credit will be met:
1.
List of proposed materials with recycled content. Indicate post-consumer recycled content
and pre-consumer recycled content for each product having recycled content.
2.
Product data and certification letter indicating percentages
by weight of post-consumer and pre-consumer recycled content for products
having recycled content.
3.
Description of Grasspave2 in stormwater design to limit the
disruption of natural hydrology by reducing impervious cover, increasing
on-site infiltration, reducing or eliminating pollution from stormwater runoff
and eliminating contaminants.
4.
Designing elements for Grasspave2 to limit the disruption
and pollution of natural water flows by managing stormwater runoff.
5.
Documenting the use of Grasspave2 to reduce heat islands to
minimize the impact on microclimates and human and wildlife habitats.
G.
Substitutions: No material will be considered as an
equivalent to the Grasspave2 unit specified herein unless it meets all areas of
this specification without exception. Manufacturers seeking to supply what they
represent as equivalent material must submit records, data, independent test
results, samples, certifications, and documentation deemed necessary by the
Specifier to prove equivalency.
H.
Manufacturer’s
Material Certification: Product manufacturers shall
provide certification of compliance with all applicable testing procedures and
related specifications upon written request. Request for certification shall be
submitted by the purchasing agency no later than the date of order placement.
I.
Product manufacturers shall also
have a minimum of 30 years’ experience producing products for porous pavement
systems.
J.
Manufacturer Quality
Certification: ISO Certification certifying manufacturer’s quality management
system for its Grasspave2 system is currently registered to ISO 9001:2008
quality standards. Any alternate
materials submitted shall provide a certification that their porous pavement
system manufacturing process is part of an ISO program and a certification will
be required specifically stating that their testing facility is certified and
in accordance with ISO.
1.6 DELIVERY, STORAGE, AND HANDLING
A.
Store products in manufacturer’s unopened packaging until
ready for installation.
B.
Protect Grasspave2 units/rolls from damage during delivery
and store rolls upright, under tarp, to protect from sunlight, when time for
delivery to installation exceeds one week.
C.
Store Hydrogrow in a dark and dry location
D.
Handling: Protect materials during handling and installation
to prevent damage
1.7 MAINTENANCE
SERVICE
Notes: Once healthy turf has been
established, the cell wall structure will have minimal visibility when
proper turf maintenance practices are followed.
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A.
Installer responsible for maintenance of grass plants
– water/irrigation, fertilizing, mowing – for one growing season.
DO NOT AERATE. See Grasspave2 Maintenance
Guide from Invisible Structures
B.
System to be maintained by _________________________, after
one growing season.
A.
Maintain
environmental conditions within limits recommended by manufacturer for optimum
results. Do not install products
under environmental conditions outside manufacturer's absolute limits.
B.
Do not begin
installation of porous pavements until all hard surface paving adjacent to
porous pavement areas, including concrete walks and asphalt paving, is
completed.
C.
Install turf when ambient air temperatures is at least 55 degrees F (13
degrees C).
D.
In cold weather, do
not use frozen materials or materials mixed or coated
with ice or frost, and do not build on frozen base or wet, saturated or muddy
subgrade.
E.
Protect partially
completed paving against damage from other construction traffic when work is in
progress.
F.
Adequately water
sod or grass seed to assure germination of seed and growth of root system.
G.
Grass coverage on the sand-filled Grasspave2 rings must be
completed within one week: See Part 3
Execution.
H. DO NOT DRIVE, PARK ON, or use Grasspave2 system for two or three mowing cycles until grass root system has matured (about 3 to 4 weeks for sod or 6 to 8 weeks for seeded areas). Any barricades constructed must still be accessible by emergency and fire equipment during and after installation.
1.9 LIMITED WARRANTY
A.
Invisible Structures, Inc. (ISI) warrants to its purchasers
that all products furnished by ISI will be free from defects in material and/or
workmanship.
B.
This warranty shall be extended for a period of five (5)
years following the date of shipment by ISI.
C.
Providing a written claim is presented to ISI within the
warranty period and after inspection by ISI showing the materials have failed
under this warranty, all defective materials shall be refurnished under this
warranty, at no charge, excluding re-installation costs. This in lieu of all
other warranties expressed or implied and is the sole warranty extended by
ISI.
D.
Our liability under this warranty is limited to the
refurnishing of materials and does not include any responsibility for
incidental, consequential, or other damages of any nature.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A.
Acceptable
Manufacturer: Invisible Structures, Inc., which is located at: 1600 Jackson St.
Suite 310 ; Golden, CO 80401; Toll Free Tel:
800-233-1510; Tel: 303-233-8383; Email: request
info (sales@invisiblestructures.com); Web: www.invisiblestructures.com.
B.
Substitutions: Not permitted.
2.2 GRASSPAVE2
A.
Composition:
1.
Manufactured in the USA.
2.
High density polyethylene
(HDPE): 100 percent recycled
materials.
3.
Color: black
4.
Color Uniformity: Uniform color throughout all units rolls.
5.
Carbon Black for ultraviolet light stabilization.
6.
Hydrogrow soil amendment and fertilizer, provided by
manufacturer with Grasspave2.
B.
Performance Properties:
1.
Maximum Loading Capability: 5721 psi (39,273 kPA) when filled with
sand.
2.
Wheelchair Access testing for ADA Compliance: Passing ASTM F
1951-08.
3.
Wheelchair Access testing for ADA Compliance: Passing
Rotational Penetrometer testing.
4.
Tensile strength, pull-apart testing: 458 lbf/in from ASTM
D638 Modified.
5.
System Permeability (Grasspave2, sand, base course): 2.63 to
38.55 inches of water per hour.
6.
Effective Imperviousness (E.I.): 10%.
C.
Dimensions (individual units are assembled and distributed
into rolls):
1.
Roll area: From
108 sq ft (10 sq m) to 538 sq ft (50 sq m), in 108 sq ft (10 sq m) increments
2.
Roll Widths: From 3.3 ft (1 m) to 8.2 ft (2.5 m), in 1.6 ft
(0.5 m) increments.
3.
Roll Lengths: From 32.8 ft (10m) to 65.6 ft (20 m), in 3.3
ft (1 m) increments.
4.
Roll Weights: From 41 lbs (19kg) to 205 lbs (93kg), in 41
lbs (19 kg) increments.
5.
Unit Nominal Width by Length: 20 inches by 20 inches (0.5 m
by 0.5 m) or 40 inches by 40 inches (1 m by 1 m).
6.
Nominal Depth: 1
inch (2.5 cm) – for rolls and individual units.
7.
Unit Weight: 18
oz (510 g) or 5 lbs. (2.27 kg).
8.
Volume Solid: 8 percent.
2.3 SYSTEM
MATERIALS
Notes: All measurements are subject to
manufacturing tolerances, unless otherwise specified.
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A.
Base Course: Sandy gravel material from local sources commonly used for road base
construction (recycled
materials such as crushed concrete or crushed aggregate are NOT acceptable).
1.
Conforming to the following sieve analysis and
requirements:
a.
100 percent passing sieve size 1 inch (25 mm).
b.
90-100 percent passing sieve size 3/4 inch (19 mm).
c.
70-80 percent passing sieve size 3/8 inch (9 mm).
d.
55-70 percent passing sieve size #4.
e.
45-55 percent passing sieve size #10.
f.
25-35
percent passing sieve size #40.
g.
3-8 percent passing sieve size #200.
2.
Provide a base course material nearly neutral in pH
(range from 6.5 to 7.2) to provide adequate root zone development for turf.
3.
Material may be either "pit run" or "crusher
run." Avoid using clay based crusher run/pit run. Crusher run material will generally require coarse, well-draining
sand conforming to AASHTO M6 or ASTM C 33 to be added to mixture (20 to 30
percent by volume) to ensure long-term porosity.
4.
Alternative materials such as crushed shell, limerock,
or crushed lava may be used for base course use, provided they are mixed with
sharp sand (20 to 30 percent) to ensure long-term porosity, and are brought to
proper compaction. Without added sand, crushed shell and limerock set up like
concrete and become impervious.
5. Alternative size and/or composition of base course materials should be submitted to Invisible Structures, Inc. (Manufacturer) for approval.
B.
Sand Fill for Rings and Spaces Between Rings: Clean sharp sand (washed concrete sand).
Choose one of the following:
1.
Coarse, well-draining sand, such as washed concrete sand
conforming to AASHTO M6 or ASTM C-33.
2.
United States Golf Association (USGA) greens, section - sand
mix “The Root Zone Mixture.”
C.
Turf Conditioner:
1.
Hydrogrow a proprietary soil amendment manufactured by
Invisible Structures, Inc. and provided with Grasspave2.
2.
NO SUBSTITUTIONS.
Notes:
Use grass species resistant to wear by traffic generally a Blue/Rye/Fescue
mix used for athletic fields in northern climates, and Zoysia, Fescue, or
Bermuda types in southern climates. Check with local sod and seed suppliers
for preferred mixtures. Dedicated fire lanes can use same grass species used
on surrounding turf. Parking applications require greatest wear-resistant
species possible, generally available only by seed or
hydroseeding/hydro-mulching.
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D.
Grass – Choose either sod or seed:
1.
Sod: [___________________]. Use 13 mm (0.5") thick (soil
thickness) rolled sod from a reputable local grower. Species should be wear resistant, free
from disease, and in excellent condition. Sod shall be grown in sand or sandy loam soils only. Sod grown in soils of
clay, silt, or high organic materials such as peat, will
not be accepted.
2.
Seed: [___________________]. Use
seed materials, of the preferred species for local environmental and projected
traffic conditions, from certified sources. Seed shall be provided in containers
clearly labeled to show seed name, lot number, net weight, % weed seed content,
and guaranteed % of purity and germination. Pure Live Seed types and amount shall be
as shown on plans.
a.
Mulch – needed
only for hydroseeding: Wood or paper cellulose commercial mulch materials
compatible with hydroseeding operations. Mulch depth according to mulch
manufacturers’ recommendation. DO NOT use mulch of straw, pine needles, etc.,
because of their low moisture holding capacity.
b.
Topsoil – needed only for seeding, recommended
for hydroseeding: Obtain specified topsoil for a light “dusting” (no more than
½” or 13mm) above rings filled with sand for seeding germination.
Notes: For Fire
lanes and emergency access, It is recommended that Fire Department inspectors
be scheduled to inspect installation of Grasspave2 during preparation of the
subbase, installation of the base course, and installation of Grasspave2
units. Most small projects can
accommodate these inspections all on the same day. Verify with Fire Department if
certificates of inspection are required.
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PART 3 EXECUTION
3.1 Inspection
A.
Examine subgrade and base course installed conditions. Do not start porous paving installation
until unsatisfactory conditions are corrected. Check for improperly compacted trenches,
debris, and improper gradients.
B.
For fire lane installations: prior to installing base course
for turf paving, obtain approval of local fire authorities of sub-base.
C.
Start of installation constitutes acceptance of existing
conditions and responsibility for satisfactory performance. If existing conditions are found
unsatisfactory, contact Architect for resolution.
3.2 PREPARATION
Notes: Ensure that
subbase materials are structurally adequate to receive designed base course,
wearing course, and designed loads. Generally, excavation into undisturbed normal strength soils will
require no additional modification. Fill soils and otherwise structurally weak soils may require
modifications, such as geotextiles, geogrids, and/or compaction (not to
exceed 90%). Ensure that grading
and soil porosity of the subbase will provide adequate subsurface drainage
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A.
Subgrade Preparation:
1.
Prepare subgrade as specified in Section 32 10 00. Verify subgrade in accordance with
porous paving system manufacturer's instructions.
2.
Proper subgrade preparation will enable the Grasspave2
rolls/units to connect properly and remain level and stationary after
installation.
3.
Excavate area allowing for unit thickness, the engineered
base depth (where required), and 0.5 inch (1.25 cm) for depth of sod root zone
or topsoil germination area (when applicable).
4.
Provide adequate drainage from excavated area if area has
potential to collect water, when working with in-place soils that have poor
permeability.
5.
Ensure in-place soil is relatively dry and free from
standing water.
6.
Uniformly grade base.
7.
Level and clear base of large objects, such as rocks and
pieces of wood.
B.
Base Preparation:
1.
Install Base as specified in Section 32 10 00. Verify engineered base (if required) is
installed in accordance with porous paving system manufacturer’s instructions.
2.
Coordinate base installation and preparation with subdrains
specified in Section 33 46 00.
3.
If required, place a geotextile separation layer between the
natural ground and the ‘engineered base’.
4.
If required, install the specified sub-drain and outlet
according to construction drawings.
5.
Coordinate base installation and preparation with irrigation
and drip irrigation lines specified in Section 32 80 00 and 32 84 13,
respectively.
6.
Place engineered base in lifts not to exceed 6 inches (150
mm), compacting each lift separately to 95 percent Modified Proctor.
7.
Leave 1 inch (2.5 cm) of depth below final grade for porous
paver unit and sand fill and 0.5 inch (1.25 cm) for depth of sod root zone or
topsoil germination area (when applicable).
Notes: Delete requirement for on-site
manufacturer’s field representative if not required
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3.3 ON-SITE
MANUFACTURER’S FIELD REPRESENTATIVE
A.
A qualified Manufacturer’s field representative shall be
available for a pre-construction meeting via phone or in person and will
provide installation videos, design details, installation instructions, and the
technical specifications.
B.
The time for on-site observation shall be indicated in the
Contract Documents and included in the base bid price.
3.4 HYDROGROW INSTALLATION
A.
Spread all Hydrogrow mix provided (spreader rate = 4.53 kg
per 100 m2 (10 lbs per 1076 ft2) evenly over the surface of the base course
with a hand-held, or wheeled, rotary spreader.
B.
The Hydrogrow mix should be placed immediately before
installing the Grasspave2.
3.5 GRASSPAVE2
INSTALLATION
A.
Install the Grasspave2 units by placing units with rings
facing up, and using snap-fit connectors, pegs and holes, provided to maintain
proper spacing and interlock the units. Units can be easily shaped with
pruning shears or knife. Units
placed on curves, slopes, and high traffic areas shall be anchored to the base
course, using 40d common nails with fender washer, as required to secure units
in place. Tops of rings shall be
between 6 mm to 13 mm (0.25" to 0.5") below the surface of adjacent
hard-surface pavements.
B.
Install sand in rings as they are laid in sections by
"back-dumping" directly from a dump truck, or from buckets mounted on
tractors, which then exit the site by driving over rings already filled with
sand. The sand is then spread
laterally from the pile using flat bottomed shovels and/or wide "asphalt
rakes" to fill the rings. A
stiff bristled broom should be used for final "finishing" of the
sand. The sand must be
"compacted" by using water from hose, irrigation heads, or rainfall,
with the finish grade no less than the top of rings and no more than 6 mm
(0.25") above top of rings.
3.6 Installation of
Grass
A. Grass coverage on the sand-filled rings must be completed within one week. Sand must be re-installed and leveled and Grasspave2 checked for integrity if rings become exposed due to wind, rain, traffic, or other factors. (Choose one paragraph below to meet grass installation method desired.)
Notes: Choose one paragraph below to match grass
installation method
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1. Preferred method: Hydroseeding/hydro-mulching - A combination of water, seed and fertilizer are homogeneously mixed in a purpose-built, truck-mounted tank. The seed mixture is sprayed onto the site at rates shown on plans and per hydroseeding manufacturer's recommendations. Coverage must be uniform and complete. Following germination of the seed, areas lacking germination larger than 20 cm x 20 cm (8" x 8") must be reseeded immediately. Seeded areas must be fertilized and kept moist during development of the turf plants. ). DO NOT DRIVE ON SYSTEM: Hydroseeded/hydro-mulch areas must be protected from any traffic, other than emergency vehicles, for a period of 6 to 8 weeks, or until the root system has penetrated and established well below the Grasspave2 units.
2. Install thin sod directly over sand filled rings, filled no higher than the top of the rings. Sod strips should be placed with very tight joints. Sodded areas must be fertilized and kept moist during root establishment (minimum of 3 weeks). DO NOT DRIVE ON SYSTEM: Sodded areas must be protected from any traffic, other than emergency vehicles, for a period of 3 to 4 weeks, or until the root system has penetrated and established well below the Grasspave2 units.
3. Install grass seed at rates per grass type. A light "dusting" of commercial topsoil mix, not to exceed 1/2" (25 mm) will be placed above the rings and seed mix to aid germination rates. Seeded areas must be fertilized and kept moist during development of the turf plants. ). DO NOT DRIVE ON SYSTEM: Seeded areas must be protected from any traffic, other than emergency vehicles, for a period of 6 to 8 weeks, or until the root system has penetrated and established well below the Grasspave2 units.
B. Adequately water sod or grass seed to assure germination of seed and growth of root system.
3.7 Protection
Notes: Choose one paragraph below to match grass
installation method.
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A. Seeded areas must be protected from any traffic, other than emergency vehicles, for a period of 4 to 8 weeks, or until the grass is mature to handle traffic.
B. Sodded areas must be protected from any traffic, other than emergency vehicles, for a period of 3 to 4 weeks, or until the root system has penetrated below the Grasspave2 units.
3.8 FIELD QUALITY
CONTROL
A. Remove and replace segments of Grasspave2 units where three or more adjacent rings are broken or damaged, reinstalling as specified, so no evidence of replacement is apparent.
B. Perform cleaning during the installation of work and upon completion of the work. Remove all excess materials, debris, and equipment from site. Repair any damage to adjacent materials and surfaces resulting from installation of this work.
3.9 MAINTENANCE
A.
Maintain grass in accordance with manufacturer’s
instructions and as specified in Section 32 92 00 Manufacturers of Turfs and
Grasses.
B.
Lawn Care: Normal turf care procedures should be followed,
including de-thatching.
C.
DO NOT AERATE. Aerator will damage the Grasspave2 units.
Aeration in not necessary in a sand root zone.
D.
When snow removal is required, keep a metal edged plow blade
a minimum of ¾ inch (17 mm) above the surface during plowing operations
to avoid causing damage to the Grasspave2 units, or
1.
Use a plow blade with a flexible rubber edge, or
2.
Use a plow blade with skids on the lower outside corners set
so the plow blade does not come in contact with the units.
END OF SECTION
Rev. April 2013
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