This article provides a detailed, cost-saving method for constructing a custom holding tank using plywood and fiberglass. It begins with planning the tank’s size and shape, calculating its volume, and sketching out locations for fittings like drain holes and sight glasses. The tank is built from ¾” plywood, assembled with glue and screws, and reinforced with corner braces.
Fittings are custom-made using PVC pipes and sealed with high-quality caulk. Once assembled, the interior and exterior of the tank are coated with fiberglass cloth and resin to ensure durability and waterproofing. After curing, the tank is tested for leaks by filling it with water. The top is then sealed with caulking and screws.
To prevent freezing in cold climates, the article suggests placing the tank on a waterbed heater. Lastly, installation into a bus or RV can be done using brackets to secure the tank.
Click on the link below to read this archived article.
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