Shelter Works vs. Concrete SheltersSee How Shelter Works Fiberglass Shelters Compare to Precast Concrete Shelters
First of all, concrete is heavy. A typical precast concrete shelter is about 5 times heavier than fiberglass - extra weight that translates into increased costs for transportation, foundation and off-loading.
Example: If you needed an insulated 12‘ x 20‘ building, the walls would need to be 9 inches thick and the building would weigh 60,000 pounds (assuming that there is no floor associated with it). That same 12‘ x 20‘ Shelter Works building would only be 4,500 pounds.
Thermal Insulation Properties
Concrete has virtually no thermal value. In fact, a typical 8” thick concrete wall carries an R-value of only 1.35. In order to compensate for this lack of thermal insulation, extra framing and insulation are often added to meet required energy codes and achieve the desired R-value.
However, this not only makes the structure incredibly thick, but the layering of dissimilar materials provides prime opportunities for gaps where moisture and other detrimental elements can get in - often resulting in a loss of integrity of the shelter.
In contrast, Shelter Works' proprietary manufacturing process yields a seamless fiberglass wall that can be adjusted to accommodate any R-value desired with a typical 1.5” thick Shelter Works' wall carrying an R-value of 12. Plus, the fiberglass provides an inherent thermal and moisture barrier, with dimensional stability and very low thermal conductivity.