|
18
<br /> 92 percent void space for the best root development and grass • Keep the porous paving area free of sediment and erosion from
<br /> coverage (GrasspaveZ) and the most volume available for desired adjacent areas as they can cause drainage and aesthetic
<br /> fill (GravelpaveZ).Most other plastic pavers come in rigid unit issues.Extra care should be taking for use in swales or berms.
<br /> blocks,which are cumbersome to install and difficult to cut • Slope should be considered.Grasspave2 and Gravelpave2
<br /> and shape.Grasspave2 and Gravelpavez rolls are considered perform the best for all vehicles when the slope is no greater
<br /> the favorite to work with by installers, than 8 percent.Light vehicles (golf
<br /> for the flexibility,continuity,and speed carts),bicycles,and pedestrian areas
<br /> of installations.Grasspave2 is the only can have up to a 20 percent slope.
<br /> product on the market specifying sand Grasspavez in fire lanes should not
<br /> infill for the grass roots.Sand is recom- - exceed five percent(consult your local
<br /> �,� e f'
<br /> mended as the inflll of choice for grass , ,a � fire departments).
<br /> pavers by Professor Bruce K.Ferguson, � � �' �;,��_� <�.�� ��,,,,� � �` �� �' • Check the permeability of existing
<br /> Univ.of Georgia,author of the book, *a��,�,�.����;y:,.h � .��., ��;�, ,� � underlying soils.Percolation rates
<br />"Porous Pavements." �r���_ -� � "����i�� should be.64 cm to 1.3 cm of water
<br /> Competing Technologies " per hour (EPA guidelines).
<br /> - `, • _ _
<br /> Porous paving technology has made � � The water table should be about
<br /> great strides not only in flexible plastic three feet (approx. 1 m) below base
<br /> course in most instances.
<br /> pavers but in other areas as well. � Bedrock should not be closer than
<br /> Permeabie asphalt,permeable con- �z �
<br /> `e���� '`���� �ii""'` ` � �� ��j�" two feet(0.6 m) below base course.
<br /> crete,interlockin unit blocks,rein- "' �
<br /> forcement mats,and concrete rid �` • Avoid use of Grasspavez and
<br /> pavements,have all improved and " ' Gravelpavez in areas where high-
<br /> advanced to meet the growing demand speed acceleration or braking and
<br /> for environmentally friendly technolo- turning occur.Examples are
<br /> gies.It is Invisible Structures'firm VancouverCiryWorksYard,Vancouver,8ritishColumbia—mainstaff entrances and exits to parking]ots
<br /> belief that you should use porous parkinglot,doneinCravelpavez. that connect to higher speed roads.
<br /> paving,even if it is not our product If your site varies from these condi-
<br /> line,whenever possible.The more ' �' '� �- '�"�'���'�`� tions,please consult ISI direcdy,
<br /> you use these technologies,the better �`� � 800-233-151 Q as some conditions
<br /> accepted they become:If you have to can be overcome with design and
<br /> pave,porous pave! ���b ���� � component adjustments.
<br /> Invisible Structures also contends � ^- ��a,`z Base Course Design
<br /> that while these competing tech- � �� ' '� Calculating the depth and composition
<br /> nologies have their place,in most �`� i ',� of materials for the base course incor-
<br /> instances,our Grasspavez and �� �.�4 °A, porates the same desi n criteria as for
<br /> � g
<br /> Gravelpavez systems outperform, �' ' other pavements:
<br /> last longer,require less maintenance, � � • Load-bearing capacity of native (or
<br /> look better,and are easier to install. <� �'` �,.° � fill) subsoil,
<br /> C h e c k w i t h o u r t e c h n i c a l s p e c i a l i s t s �� � • P l a s t i c i t y o r i m p a c t o f m o i s t u r e o n
<br /> at 800-233-1510 for the latest data. '--���- "'� � strength and longevity,
<br /> "' ""�� I ;-,. ,- • Frostheave potential,and
<br /> ,,; _ ;
<br /> Designing for Grasspave2 and • Traffic load,frequency and/or
<br /> Gravelpave� �� �s° , �_ duration.
<br /> ���`� -� � � � Sample Base Course Depths
<br /> Design for Use T ' � �
<br /> Please consult with a soils engineer
<br /> There is an area in your development, ;u��. �_ � � for site-specific base requirements.
<br /> site,or home that will most likely ben- � � � �'� '�� Generally,the depth that is used under
<br /> efit from Grasspavez and GravelpaveZ. asphalt will be the requirement under
<br /> We advise that you take a look at prop- Firelane,SanMateo,CA—Manynativegrassesandotherattractive Grasspavez/Gravelpave2.Golf carts and
<br /> er use patterns,site conditions,and vegetationcanbegrowninGrasspave2. pedestrian traffic may require nothing
<br /> other specifications to get full advan- over sandy gravel soils,and just two to
<br /> tage and long life out of our products. Invisible Structures, four inches of base course (5-10 cm) over very weak soils.Cars
<br /> 800-233-1510, is available for preliminary design assistance and usually need a six-to eight-inch base course (15-20 cm).Buses,
<br /> consultation.Please note that other porous paving systems are trucks,and fire engines can easily require eight to 12 inches
<br /> NOT interchangeable with Grasspave2 or Gravelpave2,consult (ZO-30 cm) or more.The use of geotextiles,below the base is not
<br /> our technical specifications for full installation instructions. required,but will prevent integration with subsoils and is strong-
<br /> Considerations for Design: ly advised in areas of clay or silt soils and frost heave.Do not use
<br /> • High use,low speed,and unlimited traffic volume is optimal 100 percent limestone base as limestone will compact and become
<br /> for Gravelpavez rmpervious—I£limestone must be used,mix with 25-30 percent
<br /> • Low to moderate use,low speed,with recovery time is sand(AASTO M6 or equal).
<br /> perfect for Grasspave2 or Gravelpavez
<br />
|