The shingles may need to be hand-sealed afterward, since the adhesive bond may not re-seal adequately. Upgrading the fastening system requires re-fastening the shingles with roofing nails. Properly installed, stapled shingles will usually withstand wind speeds of up to 60 miles per hour. The minimum staple crown width is 15/16-inch. This roof has staples that were poorly installed, and the shingles were poorly bonded, so their wind resistance was low. Unless he also rotates his wrist at the same time, the orientation of the staple crowns will reflect this rotation. As an installer uses an air-powered staple gun, his natural tendency is to rotate his body. To hold properly, staples need to be installed with the crowns aligned with the long axis of the shingle. The problem with staples is the orientation of the staple crown. If staples are properly installed, they offer nearly the same wind resistance as nails. Shingles fastened with staples are often not warranted against wind blow-off.īoth nails and staples have sufficient strength to resist small uplift load on the shingles, as long as the tabs remain sealed. The head of a roofing nail or the crown of a staple is what actually holds a shingle in place.Īlthough both nails and staples have been used in the past, staples are often not recommended in areas subject to high winds, and they are not allowed in new construction by the IRC. Fasteners for asphalt shingles should be roofing nails or staples. The type of fastener used to fasten the shingles is especially important in resisting wind uplift and pull-through. If you’re wrong about either one, you could find yourself being sued for a new roof. Disclaim confirmation of proper fastening.Īnother reason not to confirm proper fastener installation is that you’d need to be sure of the jurisdiction in which the property you’re inspecting is located, and you’d need to be sure of the jurisdictional requirements. If you don’t inspect fasteners and fail to mention this in your report, you may be found liable in court for roof failure related to proper fastening. If you do break the bonds of a few adhesive strips to check a representative number of areas, your report should state that you inspected a representative number of fasteners only. Your disclaimer should state that you don’t inspect each fastener, and tell why. Confirming proper fastening would require breaking the bonds of all the adhesive strips to examine all the fasteners, and you will not do that. For asphalt shingles, the adhesive strip is the most important component in resisting wind damage. You should disclaim proper fastening of asphalt shingles in your report and in your inspection agreement. How effectively fasteners hold shingles in place depends on four things: One of the key components in the wind resistance of shingles is the fasteners that hold them to the roof.
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