Over the weekend, I built the mound following these instructions. The impetus for this was the building next to our business had just added an ice rink and removed lots of very high quality turf field. I had taken a roughly 6' x 8' piece that I figured I'd use somewhere (I also have a backyard batting cage that I got from cagesplus.com) so I thought I might use it there. I ended up using this turf to cover the plywood on the mound.
The mound has a 25 1/2 inch long x 4' wide flat surface that then tapers 1" per foot until the 8' distance. It start at about 10" and tapers to about 4" at the end. I believe a 1" per foot slope is the standard mound. My son says it is great to throw off of but does this sound safe?
The mounds here are all inconsistent/not available and the portable fiberglass ones are real expensive.
Very funny Dr. Fleisig - I thought the same thing. The instructions to build the mound were quite good and I'm very happy with it. Slope seems accurate and fine. My son went inside to have breakfast and let his Dad and 80 year old grandfather (a carpenter by trade) build it! I added a little more bracing in between the joists and screwed down and glued the plywood so there is little flex. The turf is thick and soft though with a brush in rubber dirt to make it feel much like a real mound.
I built a mound using these plans back when my son was a 9U aged player. He helped me build it as part of a 4H project. He never used the saw and really only screwed in the screws into predrilled holes. I don't think it was unsafe. It has been great for preseason bullpens and tune-ups when he goes more than a week between games. Our mound just has outdoor carpet. We only wish we could have found some real turf to put down.