Fastener Length - Aluminum Fascia Over 1x6 - Building & Construction - Page 2 - DIY Chatroom Home Improvement Forum

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Old 12-22-2012, 10:05 AM   #16
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Maybe this will help: Aluminum moves quite a bit with temperature change. One thing that you do not want to do is to fasten consecutive lengths of any type of broken shape together. In other words, never fasten through overlaps. If it were me, I would use painted head Hex Washer Head screws with EPDM washers to hold your cladding in place. There are N. 12 Color cap "woodies" that work well for this. Secure the top end well, and secure the middle and bottom, centered through a slot, or larger hole so the metal can move around the fastener. Less is more. three per section max.

It has been my experience that residential siding contractors and even most commercial roofing and sheet metal contractors know little to nothing regarding the care and feeding of sheet metal, and think that SMACNA means hitting themselves in the head. This is not true of all, just most.

Metal expands and contracts rapidly with temperature change, when it is broken into a shape it becomes a column, and attains what is called columnar strength. Basically it becomes a structural member. Its going to move whether you like it or not, so you have to provide for it. This is best done with slip or retainer cleats. Remember, never fasten in the laps. This makes your 8 or 10 foot long piece, one big continuous piece, and it moves as if it were one section, wracking the heck out of fasteners. If you restrain the top, let the bottom move.



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