Cristo Balete wrote:So you did the math for how much weight each barrel is able to support in water, the weight of the wood and possibly 4 adults
I use that type of barrel with a screw-on lid as a small tow-behind platform for pool-scooping my pond, and they eventually leak through the lid. We have to store them out of the water or they take on water pretty quickly. Sometimes I'm just weary and leave them floating in the water, and within a week they take on water. I haven't found an exception to this in the probably 8 barrels I've used over the years.
Marco Banks wrote:One way to deal with the possibility of the barrels leaking is to fill them with expanding spray foam. There are several products out there, the most common that I see in stores is "Great Stuff". Loctite also makes a spray foam. If the barrel ever gets punctured or one of the bungs happens to leak, there is no place for the water to go, as the barrel is filled with foam.