I would like to hear opinions on the best location for neoprene washer screws for fastening sheet metal roofing, in particular 5-V galv. steel. It seems manufacturers generally recommend screwing thru the flat, or nailing thru the V (?). Is this because expansion/ contraction of the metal can cause the screws to break, while the nails can take it? The idea of screwing thru the V is appealing because, even in case of washer failure, very little if any water should make it thru, whereas a failed washer or screw on the flat is subject to big-time water flow.
I welcome your thoughts.
Replies
The washer works when compressed. Put it on top of the v instead on on the flat and you cannot compress it enoughunless you deform the metal. When you do that and pucker up the flats, you increase the odds of wind getting a hold of it. Wind wiggling it around tryuing to tug it off will break the screws on the tops of the v. It is only by pinching the flat of the metal and the washer between the head of the screw and the decking under it that you can control the right amt of compression. Your manbufactiurer knows what they are talking about. They also have a diagram showing you the right amt to compress it. Too much and you will fracture the neoprene. Too little and you will not have a seal agaisnt leaks. Not square driven and you leave an open gap for water on one side.
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