Posted 10/26/2015 16:15 (#4858869 - in reply to #4858837) Subject: RE: anyone done a gambrel style barn roof in metal
New Brunswick, Canada
My shop they are in the rib and the drawbacks are:
1. Too loose they leak a really surprising amount.
2. Too tight they kink the rib and leak a surprising amount, and the only fix is mess gobs of silicone or tar.
3. Too uneven tension from top to bottom makes an uneven spread on the ribs and it doesn't take much. From having a top guy and lower guy when doing my shop we were off 3" top to bottom along the 68 ft of roof.
Pluses:
1. With long sheets the rib gives a length of screw to tip over when the sun heats the steel up and grows longer. In the valley it will tear the hole a tiny bit oval.
2. No others.
conservation cop - 10/26/2015 15:24
How do you get leaking if screwed in the rib? I did a very, very small lean-to roof and I thought it made sense to screw into the rib thinking that water won't be flowing down the rib like it would in the valleys (flat)????? I started looking at other roofs and saw that everyone of them had the screws in the flat. I can't believe I was right and everyone else was wrong, but, I never looked into.
anyone done a gambrel style barn roof in metal
