I built a wood platform out of pressure treated lumber 6ft X 4ft 2×6 with beams every 16 inches and 2×6 deck. It is bolted into the house 2×10 on the 6 ft rear wall and carriage bolted to an existing deck on one 4ft side. It is carriage bolted to 4 4×4's that extend to a concrete driveway.
The generator weighs a total of 500 lb. I need to compute the weight per square inch that the platform will support.
Best Answer
As long as everything is joined and fastened properly a 6'x4' platform framed and decked with 2x6 will hold much more than a 500 lbs generator.
Though I don't think I'd count a driveway as a proper footing for your posts.