Ross Gibson, age 60, demonstrates how to use his grandfather's old hand-operated standing seam roofing tools to make the double-lock standing seams for this traditional style of metal roofing. Ross uses copper sheets to demonstrate the tools at the Slate Roofing Contractors Association of North America, Inc., annual conference on September 29, 2012, in Grove City, Pennsylvania, USA. Find more information about the conference here: [ Ссылка ].

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