Avoid the hassle or mess of laying slabs or concrete with our ProBASE 18x13 plastic base kit, when preparing a base for your new building. It is very quick to install as its interlocking design makes it easy to put together and, though lightweight, it will provide a very strong and durable base. Made from 100% recycled plastic, this base is eco-friendly. Also, you can reuse the base if you decide to reposition your building. The base allows for ventilation and drainage underneath, helping to keep the floor dry. To install the base, you simply interlock the square grids together and lay onto a firm, level area of ground. We recommend using 15kg of 10m pea gravel per square (gravel not included). Each square is 500 x 500 x 40mm. This pack contains 108 squares. For your convenience, a heavy-duty, commercially-graded membrane is also included. Super strong interlocking grid system base Simple to lay and assemble Eco-friendly high quality recycled plastic Ventilated design Includes heavy-duty membrane 2 year guarantee