JACKSMYDOG
Well-Known Member
Maybe we have a different understanding of flex. I've used 2x10 ramps and boards across 6-8 foot gaps with only a few inches of flex. Here's a ~2 foot gap, and the board is almost of the same radius as the tire, providing a foot or more of contact.I am pretty sure 2x lumber will have plenty of flex. Now you move up to 4x and yes I would agree.
Also you can easily waterproof wood with proper coating. Trick is drying out the wood prior to this.
The cuts and traction grips you cut into the board will greatly reduce it's strength and increase likely hood of breaking under load. With only 1/4" cuts into both sides of a 2x will leave 1" of board remaining.
Waterproofing is easy enough to start, but with time as the boards are exposed to UV, and thermal expansion/contraction cracks will form and draw moisture in. The more complex your traction cuts into the board, the harder it will be to get good waterproofing, and faster the elements will degrade the finish. Any flex flex will also create cracks for moisture intrusion.
If you use the boards, in mud/dirt/stone/gravel they will get damage get scratched and again draw moisture in.
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