The strength of a raft of Permavoid units is not only determined by the strength of the units but depends on the strength of the joints in between the units too. The Polypropylene PermaTies are designed to be slightly conical so they pull the individual units tightly together to form a rigid raft. For the Permavoid 150 two ties per joint are used (one inserted from each side) where for the Permavoid 85 and 85S one PermaTie per joint suffices. The PermaTies are white, so during installation one can easily spot where one is missing.
Even though the PermaTies tighly bind the Permavoid units into a raft, the PermaTies can be removed easily to deconstruct the raft without damage, enabling the user to re-use the system many times over. This is the key feature of the Permavoid subbase solution for temporary situations.
“The units are designed with tomorrow’s world in mind. Made from 100% recycled materials now, and again 100% recyclable in the future.”