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TechnicalBulletSeriesonClayBrickPavers
#6–EdgeRestraintsAbstract–ThisTechnicalBulletdetailsdo’sanddon’twithedgerestraintsalongwithprovidingadviceanddetailsonthemostcommontypesofedgerestraintsbeingusedinsegmentalpaving.Aqualitypaverinstallationshouldlastfordecades.Byprovidinghorizontalinterlock,edgerestraintsareanessentialelementtothelongevityofanysegmentalpavementinstallation.Withoutedgerestraints,paverscan“unravel”overtimeresultinginpavermovement,openjointsandpaverdamage.Somepaverinstallersignorethecriticalroleofedgerestraintsandsimplydonotinstallthembuttheimportanceofedgerestraintscannotbeoverstated.Itisimportantthatthedesignerspecifiesedgerestraintsandfollowuptobesurethattheyareinstalled.EdgeRestraintsToAvoid
• CommonBackfill• LandscapeTimbers• PlantersorGardenEdging
EdgeRestraintTips
• Asloadincreases,thesignificanceoftheedgerestraintincreases.• Asailorbandoffullpaversarerecommendedattherestraintedgeinordertomove
smallercutpiecestothepavementinterior.Thisincreasesinterlockwithinthesystem.• Inanyconditionwherebeddingsandmayclogadrainagepointormigrateintoopen
gapsintherestraint,geotextilefabricshouldbeusedtokeepbeddingsandinplace.• Buildingfoundationsmaketerrificedgerestraints.Dependinguponconditions,a
drainagesystemmayberequiredunderthepavementatthefoundation.
ManufacturedEdgeRestraintsThemostcommonedgerestraintsusedtodayaremanufacturedrestraintsmadeofPVCplasticormetalthatareinstalledbynailinglandscapespikesintoyourcrushedgravelbaseandbackfillingwithtopsoil.Manufacturededgerestraintscanbeusedinbothstraightandcurvedapplication.Manufacturededgerestraintsshouldbeinstalledontopofthebasenotthebeddingsand.PVCedgerestraintsarethemosteconomicalandcanbeinstalledeasilybyaDIYer.
Detail1:PVCEdgeRestraint
TroweledConcreteEdgeRestraintsAnothercommontypeofedgerestraintistroweledconcrete.Formanyyearsthiswasconsideredtheleastexpensiveedgerestraintrequiringonlyabagofconcreteandlimitedlabortoinstall.Overtimethismethodofinstallationprovedtobeinadequate.Theconcretewouldcrackandbreakdownandtheedgerestraintwouldfail.Contractorslookedforwaystoimprovethismethodandtodayoftenlaysteelrebarintheconcretetoprovideadditionalstrengthtothistypeofedgerestraint.
Detail2:TroweledEdgeRestraint
MasonryEdgeRestraintsTherearemanymasonrymaterialsusedasedgerestraints.Someoftheseincludegraniteblock,precastconcreteorbrickadhered/mortaredtoaconcretecurb.Itisimportantfortheedgerestraintoextendintothecrushedgravelbaseandtobackfillwithcrushedgraveltoprovidesupporttotheedgerestraint.
Detail3:MasonryEdgeRestraint
HeavyVehicularEdgeRestraintADOTapprovedconcretecurbisrecommendedinheavyvehicularapplications.Thetypicalwidthisatleast8”withadepththatextendsintothesubgrade.Curbshouldbevertical,sothatthewidthofthejointisconsistent.Angledcurbingwillresultinawidejoint,whichcanresultinsandlossandsubsequentlossofinterlock.Cutasphalthasproventonotbesufficientunderheavyvehicularloading.Edgerestraintmustbebackfilledappropriatelytowithstandloading.
Detail4:HeavyVehicularEdgeRestrain–BituminousSettingSystem
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