For a rock-solid drinks rider that’s huge on thermal mass, you can’t beat this icebox on wheels.
The phrase ‘heavy drinking’ takes on a whole new meaning with this durable concrete cooler box. With castors for mobility and an industrial finish, it’s a unique way to keep your guests refreshed.
Use 16mm melamine sheet for the formwork and a holesaw to bore a hole for a 150 x 15mm threaded outlet pipe.
To make the void inside the cooler, instead of building a negative form, take a shortcut by assembling a 670 x 345 x 300mm block of polystyrene insulation and pouring the concrete around and over it so the sides and base are about 50mm thick.
Once the concrete has cured, simply dig out the polystyrene insert.
To finish, a plywood base is embedded into the concrete and castors are secured, with a garden tap wound onto the threaded outlet pipe.
When the concrete is dry, which will take about two days, apply an epoxy based concrete sealant inside and out.
This will stop the ice from being contaminated by dissolved minerals from the concrete, in case people add it directly to their drinks.
The concrete’s high thermal mass means that once it’s been cooled by the ice you pour into it, it will stay cold for a long time, keeping the interior temperature stable.
This cooler is an open design, since a lid made out of concrete would be too heavy to handle.
A matching lid can easily be made from butt-joined decking boards or plywood, and lined with a leftover piece of the insulation.
To enhance the industrial aesthetic of the chiller, choose an outlet tap with a polished chrome finish and heavy-duty castors.