SECTION 02795

FLEXIBLE POROUS PAVEMENTS

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 Copyright 2002 -  2007 ARCAT, Inc. - All rights reserved

PART 1    GENERAL
1.1	SECTION INCLUDES
A.	Base course of sandy gravel, over sub-base prepared by others.
B.	Porous paver units.
C.	Gravel fill for porous paver units.
D.	Turf cover for porous paver units.
1.2	RELATED SECTIONS
A.	Section 02300 -  Earthwork: Subgrade preparation.
B.	Section 02620 - Subsurface Drainage:  Subsurface drainage materials.
C.	Section 02700 - Bases, Ballasts, Pavements, and Appurtenances.
D.	Section 02810 - Irrigation System.
1.3	REFERENCES 
A.	ASTM C 33 - Standard Specification for Concrete Aggregates. 
B.	AASHTO M6 - Fine Aggregate for Portland Cement Concrete. 
C.	United States Golf Association (USGA) - Greens, Section - sand mix �The Root Zone Mixture.� 
1.4	SUBMITTALS
A.	Submit under provisions of Section 01300.
B.	Product Data:  Manufacturer's data sheets on each product to be used, including:
1.	Preparation instructions and recommendations.
2.	Storage and handling requirements and recommendations.
3.	Installation methods.
C.	Shop Drawings: Submit manufacturer's shop drawings including laying pattern and anchoring.
D.	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.	List product benefits and potential LEED credit for each product specified.
E.	Verification Samples:  For each finish product specified, two samples, minimum size 10 inches (250 mm) square, representing actual product and material.
F.	Manufacturer's Certificates: Certify base course and sand fill materials products meet or exceed specified requirements.
1.5	QUALITY ASSURANCE
A.	Manufacturer Qualifications: Company specializing in manufacturing products specified in this section with minimum ten years documented experience and capable of reviewing and approving proposed application methods and providing field service representation during installation.
B.	Installer Qualifications: Installer Qualifications:  A firm approved by manufacturer and experienced in and able to provide skilled workman with satisfactory record of performance on landscaping or paving projects of comparable size and quality with minimum five years documented experience.
C.	Preinstallation Meetings: Conduct meetings to verify project requirements, sub-base conditions, and manufacturer's installation instructions. Require attendance of parties directly affecting work of this section, including the contractor, architect, engineer, installer, and manufacturer's representative. Comply with Division 1 requirements.
1.6	DELIVERY, STORAGE, AND HANDLING
A.	Store products in manufacturer's unopened packaging until ready for installation.
B.	Protect porous paver units from damage; store pavers protected from exposure to harmful weather conditions, at temperature and humidity conditions recommended by manufacturer; store turf paver units under tarp when time from delivery to installation exceeds one week.
C.	Keep grass conditioner in a dark and dry location.
D.	Handling: Protect materials during handling and installation to prevent damage.
1.7	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 progress.
F.	Protect turf paving from traffic until grass root system has matured (about 3 to 4 weeks).  Use barricades to only permit accessible by emergency and fire equipment during and after installation.
PART 2    PRODUCTS
2.1	MANUFACTURERS
A.	Acceptable Manufacturer: Invisible Structures, Inc., which is located at: 3510 Himalaya Rd. Suite 200; Aurora, CO 80011; ASD Tel: 303-233-8383; Email: request info; Web: http://www.invisiblestructures.com
B.	Substitutions:  Not permitted.
C.	Requests for substitutions will be considered in accordance with provisions of Section 01600.
2.2	MATERIALS
A.	Base Course:  Sandy gravel material from local sources commonly used for road base construction and conforming to the following sieve analysis and requirements:
1.	100 percent passing sieve size 1 inch (25 mm). 
2.	90-100 percent passing sieve size 3/4 inch (19 mm).
3.	70-80 percent passing sieve size 3/8 inch (9 mm).
4.	55-70 percent passing sieve size #4.
5.	45-55 percent passing sieve size #10.
6.	25-35 percent passing sieve size #40.
7.	3-8 percent passing sieve size #200. 
8.	For turf pavers, provide materials nearly neutral in pH (range from 6.5 to 7.2) to provide adequate root zone development for turf.
9.	Material may be either "pit run" or "crusher 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.
10.	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.
B.	Porous Paving Units for Gravel Fill:  Invisible Structures Gravelpave2; hollow rings rising from a strong open grid with a geotextile fabric bonded to the bottom of the grid; made of lightweight injection-molded 100 percent post-consumer recycled plastic, predominately HDPE; fabricated in pre-assembled rolls.
1.	Unit Size:  20 by 20 inches by 1 inch high (500 by 500 m by 25 mm high).
2.	Unit Area:  2.7 square feet (0.25 sq m) each.
3.	Rolls:  From 108 sq ft (10 sq m) to 1345 sq ft (125 sq m) in area.
4.	Unit Weight:  19 oz (535 g).
5.	Volume Solid:  8 percent.
6.	Maximum Loading Capability:  5700 psi (402 kg/sq cm) when filled with sand, over appropriate depth of road base.
7.	Color:  Black.
8.	Color:  Gray.
9.	Color:  Tan.
10.	Color:  Terra Cotta.
C.	Porous Paving Units for Turf:  Invisible Structures Grasspave2; hollow rings rising from a strong open grid allowing maximum grass root penetration and development; made of lightweight injection-molded 100 percent post-consumer recycled plastic, predominately HDPE; fabricated in pre-assembled rolls.
1.	Unit Size:  20 by 20 inches by 1 inch high (500 by 500 m by 25 mm high).
2.	Unit Area:  2.7 square feet (0.25 sq m) each.
3.	Rolls:  From 40 inches (1 meter) to 8.2 feet (2.5 meters) wide.
4.	Unit Weight:  18 oz (510 g).
5.	Volume Solid:  8 percent.
6.	Maximum Loading Capability:  5700 psi (402 kg/sq cm) when filled with sand, over appropriate depth of road base.
7.	Color:  Black.
D.	Paver Unit Anchors:  16d galvanized common nails with fender washers of galvanized metal or similar coating.
E.	Gravel Fill for Rings and Spaces Between Rings:  Clean washed stone 3/16 inch (5 mm) to 3/8 inch (9.55 mm) not graded.
F.	Turf:  Rolled sod of from a reputable local grower; free from disease, and in excellent condition, grown in sand or sandy loam soils or supplied from a recognized "Washed Sod" process.
1.	Sod Thickness:  "Thin" sod, 1/2 inch (13 mm) soil thickness, grown in sand or sandy loam soils or supplied from a recognized "Washed Sod" process.
2.	DO NOT use sod grown in soils of clay, silt, or high organic materials such as peat.
3.	Species:  As indicated on Drawings.
4.	Species:  Preferred type for local environment and expected traffic conditions.
5.	Species:  __________.
G.	Turf:  Grown from pure live seed from certified sources.
1.	Furnish in containers clearly labeled to show seed name, lot number, net weight, percent weed seed content, and guaranteed percent of purity and germination.
2.	Quantity:  ______ pounds per 1000 square feet (____ kg per 100 square meters).
3.	Species:	As indicated on Drawings.
4.	Species:  Preferred type for local environment and expected traffic conditions.
5.	Species:  __________.
H.	Sand Fill for Rings and Spaces Between Rings:  Clean sharp sand (washed concrete sand).
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.�
I.	Turf Conditioner: Hydrogrow a proprietary soil amendment manufactured by Invisible Structures, Inc. and provided with Grasspave2. NO SUBSTITUTIONS.
J.	Fertilizer:  Commercial "starter" fertilizer, with guaranteed analysis of 17-23-6, or as recommended by local grass supplier, for rapid germination and root development.
K.	Firelane Signage and Markings:  Identify entrance and physical location of firelanes using signs if gates, curbs, bollards, and other built elements do not adequately indicate firelanes; comply with requirements of local fire authorities.
L.	Grass Paver Sign:  Provide a sign indicating the presence of turf paver paving, stating that special maintenance is required, with manufacturer's phone number; provide sign of durable materials suitable for outdoor exposure.
M.	Mulch:  Wood or paper cellulose commercial mulch materials compatible with hydroseeding operations. DO NOT use mulch of straw, pine needles, etc., because of their low moisture holding capacity.
PART 3    EXECUTION
3.1	EXAMINATION
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.	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
A.	Clean surfaces thoroughly prior to installation.
B.	Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the project conditions.
C.	Ensure that sub-base Specified in Section 02700 is adequate to receive designed base course, wearing course, and the required design loads. Ensure that grading and soil porosity of the sub-base will provide adequate subsurface drainage.
3.3	INSTALLATION
A.	Install in porous pavement in accordance with manufacturer's instructions.
B.	Place base course material over prepared sub-base to grades indicated on the Drawings. Place in lifts not to exceed 6 inches (150 mm), compacting each lift separately to 95 percent Modified Proctor. Leave 1 inch (25 mm) of depth below final grade for porous paver unit and gravel fill.
C.	Immediately before installing turf paver units, spread turf conditioner evenly over the surface of the base course, at rate of 10 pounds per 1000 square feet (4.5 kg per 100 sq m) using a hand held or wheeled, rotary spreader.  Placement of conditioner too long before installation may cause the polymer to expand when installing the units.
D.	Install porous paver units and fill in accordance with paver unit manufacturer's instructions.
1.	Where gravel surface is indicated, install porous paving units with gravel fill.
2.	Where gravel surface is indicated, install porous paving units with gravel fill with Portland cement binder.
3.	Where turf (grass) surface is indicated, install porous paving units with sand fill and seed.
4.	Where turf (grass) surface is indicated, install porous paving units with sand fill and thin sod.
5.	Where turf (grass) surface is indicated, install porous paving units with thick sod without any fill.
E.	Install porous paver units by placing with rings facing up, using the snap fit system provided along each edge to maintain proper spacing and interlock the units.
1.	Cut units to shape with pruning shears and knife.
2.	Place with tops of rings flush or slightly below the surface of adjacent hard-surfaced pavements.
3.	Anchor units to the base course, using anchors specified, wherever anchorage is necessary to prevent movement by traffic.
F.	Fill (Gravel or Sand):  Install fill into rings, after the units are anchored, by "backdumping" directly from a dump truck, or from buckets mounted on tractors, which then exit the site by driving forward over rings already filled.
1.	Spread fill laterally from the pile using flat bottomed shovels and/or wide "asphalt rakes" to fill the rings.
2.	Use a stiff bristled broom for final "finishing."
3.	Compact gravel, if necessary, by using a vibrating plate compactor or small roller.
4.	Compact sand by using water from hose, irrigation heads, or rainfall.
5.	Fill and compact so that finish grade is no less than at the top of rings and no more than 1/4 inch (6 mm) above top of rings.
6.	Portland Cement Binder for Gravel:  Before placing gravel, mix dry with 10 percent Portland cement by weight of gravel; thoroughly wet base before placing; after compaction lightly mist surface and cover with water resistant tarp or plastic sheeting for minimum of 3 days or until mixture has bonded.
G.	Inspection and Repair: Remove and replace segments of porous paver units where three or more adjacent rings are broken or damaged. Reinstall as specified, with no evidence of replacement.
H.	Hydro-Seeding:  Install grass seed and mulch over sand-filled rings using commercial hydroseeding equipment. Apply at rates specified and in accordance with manufacturer's recommendations.
1.	Provide uniform and complete coverage.
2.	Following germination, immediately re-seed areas larger than 8 by 8 inches (200 by 200 mm) without germinated seeds.
3.	Keep seeded areas mulched, fertilized and moist during plant development for 6 to 8 weeks.
I.	Thin Sod:  Install sod directly over paver units with very tight joints.
1.	Keep sodded areas fertilized and moist during root establishment (minimum of 3 weeks).
2.	Protect sodded areas from all traffic other than emergency vehicles for a period of 3 to 4 weeks, or until the root system has penetrated and established grass well below the paver units.
J.	Seeding:  Install sand fill over paver units with a light dusting of commercial topsoil mix, not to exceed 1/2 inch (25 mm) thickness placed above the rings and seed mix to aid germination.
1.	Keep seeded areas mulched, fertilized and moist during plant development for 6 to 8 weeks.
3.4	CLEANING
A.	Keep the work area and adjacent areas clean during the work.  Remove all excess materials, debris, and equipment from site.
B.	Repair any damage to adjacent materials and surfaces resulting from installation of this work.
3.5	PROTECTION
A.	Protect installed products until completion of project.
B.	Repair or replace damaged products before Substantial Completion.

END OF SECTION