[Shop-talk] Corrugated fiberglass panels. How many screws?

[David Scheidt]

On Sun, Jun 29, 2008 at 11:22 PM,  <pethier at comcast.net> wrote:
> I am putting corrugated fiberglass panels up as a cover over a deck.  I bought the thickest white ones my local Menard's carries.  The finished roof will be about 17 x 8 feet.  This is a simple shed-style roof, with water draining down the corrugations at a 16-degree angle to a (wavy) drip edge.
>
> Each panel is 8 feet long, and covers 2 feet wide when overlapped one wavelength.  I have corrugated strips of wood which purport to match the shape of the fiberglass.  The concept is that one drills a hole through the top of the wave and put a pole-barn screw (with built-in rubber washer) through the top of the wave, through the corrugated strip and into the wood crosspiece below.  I have four such crosspieces.
>
> My question is:  How many screws do I need across each panel?
>
> If I put them three across, that would be a dozen screws through each panel (the overlap section would mean that two panels share the four screws on the edge).  Is this enough?
>
> BTW, I don't intend to cut any of these panels.  The panel length should be correct, and I will make the width come out correct by overlapping more than one wavelength.

We've got panels like this as "windows" in the pole barn.  They're on
the vertical walls, so they don't have to support a snow load.
They're a bit bigger than yours, 8' X 30",  I think.  They've got
three supports, each with three screws through it.  (At least, that's
how the row at eye level is done.  There's another one on the north
wall way high, and I can't see the screws from the ground.  )



-- 
David Scheidt
dmscheidt at gmail.com