I'm designing an outdoor bench. It will be made out of 1in plywood and pressure treated 2x4s. I'm wanting an 8ft length (give or take). The seat will be 7 2x4s. Can I get away with an open span? or do I need to add another bracing section?
Here's a fly around of the bench if that helps https://youtu.be/OLPQDtLKUG8
Sorry if this is a stupid question. I tried the sagulator, but it didn't have pressure treated as an option.
So I realized this design had two fatal flaws regardless of the weight on the seat.
- There is no real horizontal shear support for the base
- Having a long flat base as this does, will not sit well on an unlevel surface like my yard.