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Just built this 4' girder bridge from parts bought at Lowes. It is all plastic construction and once painted should hold up well outside.
Here's how I did it:
I started with 1 -8' piece of 1 1/2" plastic and 2 -8' by 3/4 pieces of plastic trim from the screen section
I cut some 1 1/2' tough board into 3" lengths and built a ladder
attached te 3/4" to top and bottom of ladder to form flange
then added styrene angles to create the plate effect glued with crazy glue
Here is the first load test with a 4' span. A little defection.
With a 2 foot span no deflection and it looks better.
anyone know what color I should paint it?
Just built this 4' girder bridge from parts bought at Lowes. It is all plastic construction and once painted should hold up well outside.

Here's how I did it:
I started with 1 -8' piece of 1 1/2" plastic and 2 -8' by 3/4 pieces of plastic trim from the screen section

I cut some 1 1/2' tough board into 3" lengths and built a ladder

attached te 3/4" to top and bottom of ladder to form flange

then added styrene angles to create the plate effect glued with crazy glue

Here is the first load test with a 4' span. A little defection.

With a 2 foot span no deflection and it looks better.

anyone know what color I should paint it?