![]() While the test were done on painted screw heads. The impact forces acting on the head will damage the screw surface and lead to early corrosion. Among these are damage to fastener heads, over-driving, scratched and damage to paint finishes leading to premature corrosion.” In a Canadian Sheet Steel Building Institute (CSSBI) article release CSSBI Sheet Steel Facts 42 March 2015 “Fastening Prepainted Sheet Steel Roofing and Siding” states “ No matter the evaluation criteria, the impact driver was significantly the worst performer. ![]() The conclusion of the MCA technical bulletin states that “Use of the wrong tool or a driver with excessive RPM can lead to fastener damage and problems. Overdriven screws also damage the EDPM sealing washer and could potentially cause leaks.” The exact same statement was echoed by the National Frame Building Association (NAFB) Technical Bulletin “Proper Tools for Fastening Metal Panels” Version 1 in 2014. These tools can cause damage to the drill points, break screws, chip painted surfaces, and strip threads on Type 300 stainless steel screws. The use of Impact Driver equipment resulted in the Metal Construction Association (MCA) addressing the situation in their Technical Bulletin dated Version 1 “Proper Tools for Fastening Metal Panels”. The Impact Driver is specifically addressed “Tools Not Recommended: Impact Drivers are not recommended for fastening metal panels, or composite panels used for roof and/or wall system installation. The result of the combination of the rotation and concussive blows of the Impact Driver is raw unadulterated power that delivers two to three times more turning force (torque) than average cordless battery powered Drill/Driver screw guns. Other trades have now experienced the advantages of the use of both the rotation and concussive blows of these beasts to power drive screws thorough the thickest densest woods, concrete and steel when called upon. ![]() An Impact Driver is now a powerful battery powered hand tool that delivers a strong, sudden rotational and downward force which previously has been a mechanics tool of choice to loosen larger screws and nuts that are corrosively “frozen” or locked bolts due over torque pressure originally applied during their original install. An Impact Driver has evolved into a compact cordless battery powered portable hand tool that has made its way unto numerous metal building erection jobsites with negative consequences. ![]()
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