b'Installation ofShingles on Asphalt Low-Sloped Roofs Asphalt shingles are an effectivedams is toirgles, or by special shin applpreventthe occurrence.gleicaroofcoveringmaterialforslopedT optimum way to accomplishtion. he roofs.Theycanbesuccessfullythisis to provide complete,openThe underlay can bein improved as used on "low-sloped" roofs,wellandadequateatticventilation.oneof twoways; twopliesof assteeperpitches. T anyAlthou criticaltotheperform asph saturated felt,one ply of ypically,ghaltor roofslopelessthan4:12 (18.5ance of any roof system, ventilationself-adh ngmodifiedasphalt eridegrees)isconsideredalow isp u ly important onlow membranemaybeused.Should artic larsloped roof. Asphaltslopedroofs.Justasthe lowerwaterwind-driven heavy rains from wate runoffshingles, shingles can be suc pitch retards the rate ofrsneak past thethe undertheatt air se ondacessfully applied toon top ofshingles,icflowlay cannowprovideac ry theselowerslopes,from soffit to ridge is slower thanwater shedding layer. providing a few spe on steep roofs.ensureOptionally, theapplicaToadequateshingle cial application pro airflow on the lower slopes, the nettionmaybecustomizedforlow ceduresarefol freeventilatingareaofallventsslopes. Standard th shingles ree-tab lowed.Asphaltshould be increased fromstan can be applied with ashinthereduced shinglesshoulddard11300thtoa minimumofgleexposure,resultinginthe /1 never beapplied to1S0thofthe atticfloorarea.shingleseffectivelybeingapplied roofslopesbelowApproximatelyhalfofthevent"triple coverage" T shingles are he 2:12 (8.5.openings should be at or near thecement down at time of installadegrees) ed All of the applica soffits, withother half as closetion to protect against wind uplift. the tionstepsusedfortotheridgeaspractical.(Note:Withthis method,anunderlayis shingles on steeper,Some vents designed and sold fornot required,ther typically andefore standard roof slopesstandard roof pitches maynotbenot used. alsoshouldbesuitable/recommendedforlowGenerally,three-tabasphalt followedwhenslopes. Ch with the vent manu shinglesarebestsuitedfor loweck installingshinglesfacturer to ensure ventsusedareslope application.rshingle Fo other Photo courtesy ofRooting, Affordableon low [4:12 down to 2:12 (18.5approved for yourslope).designs, checkwiththespecific toroof Inc.,Ill. Aurora,8.5 degrees)] slopes. F thefin Although building codes permitmanufacturer to see if th prodorose ished roof to perform well, qualityvarioustypesoficedammem ucts are recommended or approved materialsmustbeusedandtheybranes, for best roof performance, itfor use on low slopes. m be inst properly, folis recommended that you use self Despiteusing quality materials ustalledlowingthem \'s applicationadheringmodifiedasphaltmem and following a of these apanufacturer llplicainstructions.T article does notbranes for secondary ice dam pro tion r tions, a low-slohisecommenda pe address all the good roofing prac tectiononlow-slopedroofs.roof is arecondition seve exposure tices needed for all roof slopes, butBecause ice dams can be severe onforasphaltroofingshingles.In will highlight someofthemajorloweropes, the membrane shouldnorthernlatitudesandclimates, slconcerns of low-sloped roofs.extenda minimumof36inchessh on low-slope roofs typiingles First, the protection and preven beyond thewall line of thecallymore r idly than steeper interiorageaption of ice dams will be discussed.insidewall.Applythemembraneroofs,rarely last lon th 15 andgeran The mere fact that low-sloped roofsaccordingto themanufactur years. er\'s arenot steep,means thatrainorinstructions.This article is provided through melting snow on the roof will notF theremainderof theroof,thecourtesyoftheCanadian or run off quickly. Ice dams,,enhanced water shedding alsoisAsphaltShingleManufacturers\' thereforecan form more easily,grow to arequiredtoprotectagainstwaterAssociation. and much largersizethanstandarden due to wind-driven rain. This try slopes. The best way to protect yourcan be addressed eitherimprovby roof fromthedamage duetoiceing the underlay beneath the shin-'