multi - layer concrete forms are provided that can include outer layers having a scrim layer there between . the forms may include a form section having four edges , wherein at least two of the edges are configured to abut one another ; and a flange section extending from at least one of the other four edges . processes for constructing a concrete form are provided with the process including providing a substantially flat section of form to a construction site , with the section having four edges ; substantially abutting at least two of the edges to create a tubular form ; and heat sealing the edges .