The best jack pads!
While I would love to take credit for the unique 'pyramid' design, I cannot. Unfortunately I don't know who to credit the design to, but I believe it was an engineer that came up this unique idea for a jack pad. You do not need a square block of wood for a pad, this design has a very sound engineering principle behind it (but since I'm not a mechanical engineer, I don't know what to call it!)
My requirements for a jack pad are:
Durable - won't break or deteriorate
Effective - won't bend, provides height
Large footprint - reduces the psi load on the ground (won't sink)
Easy to stow - I designed these to fit in my left side compartment
Simple to build - these can be built with a circular saw and driver drill
Not too heavy - these turned out to be heavier than expected, but version 2.0 will be lighter
Cost effective - the two pads cost maybe 30 bucks plus I had plywood left over
One 4'x8' sheet of 3/4" pressure treated plywood
Exterior deck screws
Plan your design - start with your base dimension first. My left side storage bay is about 22" deep so I decided to make the base of the jack pad 20" square so it will easily fit into that bay; that's a very healthy footprint which will resist sinking into softer ground. I made each higher piece of plywood about 1.5" smaller than its mate, but I think that could be 2". When you are designing yours, figure out the dimension of the topmost pad - the metal foot of the jack should be fully supported by your top wood layer.
"Plan your work, then work your plan.." Once you have your design figured out, make a cut sheet for your 4'x8' sheet of plywood. Have every part sketched out on a scale drawing of your plywood. Cut the plywood, then assemble. I just 'eyeballed' when I was assembling each layer. Use some waterproof glue and a few screws and build your cake, er, jack pad, layer by layer.
Here's what Version 1.0 looks like:
Simple, effective, inexpensive!