I went out on a 2/12 about 20' up, and decided it wasn't for me.
So, I made planking with 2x4 rails and crossbraces, with 1/2" (5-ply)
plywood for decking. I've been these same ones off and on for 15 years,
no problems. OTOH, I'm a bit under 200 #.
Or buy or rent one of these...They also have ones that reach out 16 feet...I
have one for doing drywall in stairwells..I run it out from the top of the
landing to a ladder sitting on the steps leaning on the back wall ......They
are about 250 to buy at Homedepot or Lowes....Not sure how much it is to
8-13' Telescoping Aluminum Extension Plank
A 14' 2x12 plank of what? You could be fine with one #2 grade 2x12 and a
goner if you pick the one right next to it. If you do get a 2x12 you
want to make sure it's stamped (or labeled) as Scaffold Grade, which
meets stricter requirements for knots, grain slope, etc. You may have to
go to a real lumberyard to find one.
You most certainly can span 13' with regular scaffold components, they
are available in every conceivable variation to handle any situation. Go
to your local scaffold supplier (not Home Depot rental or the like) show
them a sketch of your application and rent the scaffold components
required for the application.
According to the Sagulator
<http://www.woodbin.com/calcs/sagulator.htm , a ponderosa pine 2x12
will sag almost 4 inches. If you bounce, it will sag more.
Adding a 2x4 brace reduces the sag to about 2 1/2 inches.
as per the other replies.....
when at mid-span the deflection would be about 4 inches & the bending
stress above 1600 psi.
WAY too flexible & not strong enough (imo)
I would suggest a commercial scaffold platform piece or a homemade
unit of 2x4's on edge with plywood skins
What would be the result if the system failed? fall a few feet
or ????? be careful
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