The BoatMat creates a firm foundation for a boat lift. Keeping the lift level and preventing it from sinking in into the soft mucky lake bottoms. BoatLift-Mats are designed to lock soft soil in place and to spread bearing loads over a large area. A 15-foot BoatLift-Mat® is engineered to hold up to 6,000 pounds in even the softest mucky soils. The more “interlocked” soil particles there are, the more “friction” surface there is for other particles, and with right amount of water “dilation” the more particles stick together, the more opportunity there is for “cementing,” to bond the soil particles, (like the “cemented” dried mud left on your boots).
- small 14' x 9'
- medium 14' x 14'
- large 19' x 14'
- extra-large 24' x 14'
Now, think of setting your boat lift and boat in your lake. Let’s say the total weight is 4,500 pounds. There are four foot plates that are one square foot each. So each one has to hold 1,125 pounds (4,500 / 4). That’s a lot of weight for soil that has a very low “bearing load” capacity. Now, think of putting that same lift and boat on a BoatLift-Mat where the weight is distributed over 225 square feet. If you divide 4,500 pounds by 225 square feet, you get just 20 pounds per square foot. You’ve transferred the “weight distribution” like a snowshoe from 1,125 pounds to 20 pounds per square foot. Much better, isn’t it? Meanwhile, the pressure of 4,500 pounds squeezes some of the water out of the soil beneath the BoatLift-Mat, even though it’s still under water, there’s less water in the soil directly under your lift, allowing it to stick together better, kind of like your sand castle. A BoatLift-Mat simulates underwater the factors that keep soil together on dry land, friction, interlocking and dilation. Cementing also occurs naturally under a BoatLift-Mat, but it’s a secondary process. As for weight distribution, the area closest to the foot plates on your boat lift will always be holding more weight than the edges of the BoatLift-Mat. How much more? You’d need a geotechnical engineer doing some pretty fancy calculus to figure it out. But even if it were five times as much with our example of a 4,500 pound boat and lift, the area near the foot plates would only be holding 100 pounds per foot instead of the 1,125 pounds without it.