Calhoun Fabric Covers

Strong and Durable


Calhoun's fabric covers are made of engineered high-density polyethylene (HDPE) fabric manufactured from 12 oz per square yard in weight, and 24 mil thick.


HDPE fabric is manufactured into a woven sheet-form and then coated on both sides with a specialized, thick protective layer that aides in protecting against UV damage. HDPE offers increased protection against abrasion during fabrication, installation, and everyday use.


Known for its large strength-to-density ratio (which can range from 930 to 970 kg/m3), HDPE provides stronger intermolecular forces and tensile strength than other tensile fabric membranes.


Energy Efficient


Calhoun's fabric covers feature up to 16% translucency for Non-Fire Retardant fabric and 19% translucency for Fire-Retardant fabric, providing natural illumination for building interiors during the day.


The natural lighting results in a brighter atmosphere than traditional structures, and eliminates the need for artificial lighting for reduced energy costs. Our fabric buildings can also include skylights and solar panels.

Calhoun offers optional fabric cover materials such as Fire Retardant (FR) fabric and polyvinyl chloride (PVC) fabric.


Fire Retardant (FR) Fabric


FR fabric is manufactured with self extinguishing properties to eliminate the flame instead of adding fuel like many other building materials would. It provides extra protection for your assets while abiding by strict building codes.


Polyvinyl Chloride (PVC) Fabric


Depending on your industry, application, and requirements, PVC fabric covers are recommended due to their durability, versatility, chemical resistance, longevity, and cost-effectiveness. Because of its amorphous structure which contains halogens like chlorine and fluorine, PVC is known for its chemical stability allowing the PVC fabric cover to resist flame, chemicals, and oil.


Additional Options


With a Calhoun fabric cover, you also select from a variety of colors for greater aesthetic appeal and customization.


We also offer two fabric cover installation options depending on the size and budget of your structure: Bag Cover System or Keder Panel System.

Bag Cover System

Calhoun’s Bag Cover System is a one-piece fabric cover, pulled over the entire structure in one quick and easy step. It is more affordable than other fabric cover systems and stays on tighter on smaller structures.


Key Advantage: Affordable and efficient installation

Ideal For: Smaller CC series

Keder Panel System

A Keder Panel System is a custom-made aluminum extrusion, mounted at each truss section of the fabric structure. Keder panels are made to the exact bay spacing with a 1/2″ industrial rope continuously heat welded in place at the sides.


The fabric keder panel is secured through the aluminum extrusion and tensioned at both ends. This system ensures the fabric will not touch the frame of the structure, helping to create a quieter environment with no risk of wear points on the cover.


Purlins and cables are added, securing the structure and giving the keder panel fabric its ultimate tension laterally. A leak-proof vinyl cap is added to the aluminum extrusion for sealing.



With our Keder Panel System, any areas of the building exposed to a fire can be re-covered at minimum since Calhoun’s steel frame construction is non-combustible. The fabric membrane will melt when exposed to fire and will ensure any fire does not spread.


Our proprietary triple protection system provides three layers of protection to reduce corrosion and prevent snow, ice or water from entering the gasket or building. The system includes a seal that acts as a barrier between the aluminum and steel to reduce the chance of corrosion between the two metals. In addition, it also provides a third layer of protection to ensure no water enters the building.


Calhoun is the only company that offers this level of detail and protection.



The Keder Panel System does not allow the fabric to touch the structure’s frame, and helps to create a quieter, more secure environment with no risk of wear points on the cover, adding years of life to your structure. Calhoun’s Keder Panel System is standard on all buildings over 60′ wide.


Key Advantage: Quick replacement of individual panels if damaged, instead of removing the entire fabric cover

Ideal For: HT series, VP series, larger CC series