Synthetic fabrics are now the choice, usually made from polyester, fiberglass, polyethylene, modacrylic, or fibers. Polyester fabric has the flexibility to be packed and unpacked, while fiberglass fabric does not. Polyethylene is a newer fabric and it is 100 percent recyclable. Layering or lining is used with fabrics to improve performance, such as R-values. Structural fabrics can be supported in three ways.
Arches allow larger spans but require more structural engineering.
External trusses allow for a wide-open space but require costly engineering and materials. You may apply for credits either by downloading the form and faxing or mailing it, or by completing the electronic version and sending it via the Internet.