POROUS FLEXIBLE PAVING SECTION 32 12 43 or 32 14 43
AirPave Product Specification (CSI Format)
Notes: This product guide specification is written according to the Construction Specifications Institute (CSI) Format, including. 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.
SECTION 32 12 43 or 32 14 43
POROUS FLEXIBLE PAVING
(Formerly 02795 Porous Paving)
Notes: This section covers AirPave Porous Flexible Pavement System from AirField Systems. 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 AirPave units, an engineered base course, Sustane fertilizer, sand, and grass from seed, hydromulch, or sod.
Consult AirField Systems, LLC. for assistance in editing this section for the specific application.
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
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] [__ __ __ – __________].
A. ASTM F 1951-99 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 AirPave porous flexible 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. AirPave geocell grid.
2. Engineered sand and gravel base course.
3. Sustane fertilizer, supplied with AirPave.
4. Sand fill or USGA greens mix. (per spec)
5. Selected grass from seed, hydroseeding/hydro-mulching, or sod.
6. Mulch (needed only for seeded or hydroseeded installations).
C. The AirPave grass paving units, sand, and base course work together to support imposed loading.
D. The AirPave grass paving units, Sustane, and sand fill contribute to vegetation support.
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 AirPave 10” x 10” section of AirPave material.
D. Installation Instructions: Manufacturer’s printed installation instructions. Include methods for
Maintaining installed products.
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
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 for each product having recycled content.
2. Product data and certification letter indicating percentages by weight of post-consumer for products having recycled content.
3. Description of AirPave 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 AirPave to limit the disruption and pollution of natural water flows by
managing stormwater runoff.
5. Documenting the use of AirPave 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 AirPave 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.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Store products in manufacturer’s unopened packaging until ready for installation.
B. Protect AirPave units from damage during delivery and store under tarp, to protect
from sunlight when time for delivery to installation exceeds one week.
C. Store Sustane Fertilizer (with a Guaranteed Analysis) 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 clover structure will have minimal visibility when proper turf
maintenance practices are followed.
A. Installer responsible for maintenance of grass plants – water/irrigation, fertilizing, mowing – for one
growing season. DO NOT AERATE. See AirPave Maintenance Guide from AirField Systems
B. System to be maintained by _________________________, after one growing season.
1.8 Project Conditions
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
F. Adequately water sod or grass seed to assure germination of seed and growth of root system.
G. Grass coverage on the sand-filled AirPave clovers must be completed within one week: See Part 3
H. DO NOT DRIVE, PARK ON, or use AirPave 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). Use barricades to
only permit accessible by emergency and fire equipment during and after installation.
1.9 LIMITED WARRANTY
A. AirField Systems, LLC. warrants to its purchasers that all products furnished by AirField Systems will be free from defects in material and/or workmanship.
B. This warranty shall be extended for a period of five (6) years following the date of shipment by AirField Systems. See (AirField Systems Limited Warranty for AirPave).
C. Providing a written claim is presented to AirField Systems within the warranty period and after inspection by AirField Systems 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 AirField Systems.
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
A. Acceptable Manufacturer: AirField Systems, LLC., which is located at:
8028 North May Ave Suite 201;
Oklahoma City, OK.;
B. Substitutions: Not permitted.
1. Manufactured in the USA.
2. Copolymer Polypropylene Resin using an Impact Modifier: 100% post-consumer recycled materials.
3. Color: black
4. Color Uniformity: Uniform color throughout all units.
5. Carbon Black for ultraviolet light stabilization.(minimum 3%)
6. Sustane fertilizer (with a Guaranteed Analysis Required by Law), provided by manufacturer with AirPave.
B. Performance Properties:
1. Maximum Loading Capability: 6,747 psi (46,519 kPA) or (971,568 psf) when filled with sand.
2. Wheelchair Access testing for ADA Compliance: Passing ASTM F 1951-99.
3. Tensile strength, pull-apart testing: 2,145 psi from ASTM D638.
4. System Permeability (AirPave, sand, base course): 2.63 to 38.55 inches of water per hour.
C. Dimensions (individual units are distributed palletized at 114 parts per pallet):
1. Part Dimensions: 31.784”x31.880”x1”
2. Part square footage: 7.03 sqft.
3. Nominal Depth: 1 inch (2.5 cm) – per unit.
4. Unit Weight: 3.1 lbs. (1.4 kg).
5. Volume Solid: 8 percent.
6. Area per Pallet: 798 sqft. (weight approx. 390 lbs.)
2.3 SYSTEM MATERIALS
Notes: All measurements are subject to manufacturing tolerances, unless otherwise specified.
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).
Conforming to the following sieve analysis and requirements:
1. Sources of the material can include either “pit run” or “crusher run.” Crusher run material will generally require sharp sand to be added to mixture (33% by volume) to ensure long-term porosity. If there is difficulty in finding local sources to meet this sieve analysis, and alternative mixture can be created by mixing 2/3 crushed drainage rock (0.75” dia) with 1/3 coarse, well-draining sand (AASHTO M6 or ASTM C-33).
2. Selected materials should be nearly neutral in pH (range from 6.5 to 7.2) to provide adequate root zone development for turf. Testing the subbase for proper pH balance is recommended.
3. Alternative materials such as crushed shell, limerock, and/or crushed lava may be considered for base course use, provided they are mixed with sharp sand (33%), and brought to proper compaction and pH balance. Consult a licensed geotechnical engineer for approval. (Crushed shell and limerock alone can set up like concrete without sand added.)
B. Sand Fill for Clovers and Spaces Between Clovers: 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. Fertilizer (with a Guaranteed Analysis):
1. Sustane an Organic Fertilizer with a Guaranteed Analysis Provided by AirField Systems, LLC. with AirPave.
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.
D. Grass – Choose either sod or seed:
1. Sod: [___________________].Use a 1⁄4 inch shallow cut 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 (with less than 15% clay content). 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
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 (1/4” or 6.5mm to 1/2” or 13mm using the least amount possible) above clovers filled with sand for seeding germination.
E. Fertilizer (with a Guaranteed Analysis): Sustane a commercial “starter” fertilizer, with Guaranteed Analysis of 17-23-6 Provided with AirPave, or as recommended by local grass supplier, for rapid germination and root development. Applying Fertilizer per spec is critical to the success of the project.
PART 3 EXECUTION
(It is recommended that Fire Department inspectors be scheduled to inspect installation of AirPave during preparation of the subbase, installation of the base course, and installation of AirPave units. Most small projects can accommodate these inspections all on the same day. Verify with Fire Department if certificates of inspection are required.)
A. Examine subgrade and base course installed conditions. Do not start AirPave 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 / Project Manager for resolution.
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
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 AirPave grid 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
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: For Fire lanes and emergency access, It is recommended that Fire Department inspectors be scheduled to inspect installation of AirPave during preparation of the subbase, installation of the base course, and installation of AirPave units. Most small projects can accommodate these inspections all on the same day. Verify with Fire Department if certificates of inspection are required.
3.3 MANUFACTURER’S REPRESENTATIVE
A. A qualified Manufacturer’s field representative shall be available for a pre-construction meeting via phone and will provide design details, installation instructions, and the technical specifications.
3.4 SUSTANE INSTALLATION
A. Spread the first layer of Sustane Fertilizer provided (spreader rate = 4.53 kg per 100 m2 (10 lbs per 1076 ft2) evenly over the compacted base course with a hand-held, or wheeled, rotary spreader. Place fertilizer mix should be immediately before installing the porous flexible paving units.
B. The second layer of Sustane mix should be placed immediately before installing the sod or hydroseed on top of the AirPave System.
3.5 AIRPAVE INSTALLATION
A. Install the AirPave units by placing units with connectors and the pinning platforms flush against the prepared subbase. The AirPave GeoCell panels are to be installed with the larger diameter clover openings (cup side down) and pinning platforms facing downwards (grid side down). Place the first GeoCell panel to the field’s upper left hand corner. It is of primary importance to orient the GeoCell materials with the integral indicator tab (painted yellow) to the panel’s bottom left hand corner. Proper sequencing and orientation of panels will result in a more rapid installation.
The AirPave units can be shaped to individual areas as needed with an appropriate cutting device if only a few parts need to be trimmed you can use tin snips. If you have many parts to trim we recommend hand held angle grinder or setting up a table and use a circular saw with a no melt, plastic cutting saw blades. (Call Airfield Systems at 405-359-3775 with questions or concerns)
AirPave units placed on curves and slopes shall be anchored to the base course, using 8” Chisel Point Pins 6 Gage BB Wire and 11⁄2 inch round attached washers, as required to secure units in place. Tops of clovers shall be between 6.5 mm to 13 mm (1/4″ to 1/2″) below the surface of adjacent hard-surface pavements.
B. Install sand in clovers by “back-dumping” directly from a dump truck, or from buckets mounted on tractors, which then exit the site by driving over clovers 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 clovers. 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 clovers and no more than 6.5 mm (1/4″) above top of clovers.
Spread the second layer of Sustane fertilizer mix at the rate of 25 kg per 100 m2 (25 lbs per 1,000 SF) evenly over the surface of the sand filled AirPave with a hand-held, or wheeled, rotary spreader.
3.6 INSTALLATION OF GRASS
A. Grass coverage on the sand-filled clovers must be completed within one week. Sand must be re-installed and leveled and AirPave checked for integrity if clovers 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
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 AirPave units.
2. Install thin cut sandy loam based sod (with less than 15% clay content) directly over sand filled clovers, filled no higher than the top of the clovers. 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 AirPave units.
3. Install grass seed at rates per grass type. A light “dusting” of commercial topsoil mix, not to exceed 1/2″ (13 mm) will be placed above the clovers 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 AirPave units.
B. Adequately water sod or grass seed to assure germination of seed and growth of root system.
Notes: Choose one paragraph below to match grass installation method.
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 AirPave units.
3.8 FIELD QUALITY CONTROL
A. Remove and replace segments of AirPave units where three or more adjacent clovers 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.
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 AirPave units. Aeration in not necessary in a sand root
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 AirPave 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