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Building foundations

Foundation requirements vary depending upon the building size, intended period of exposure, and ground conditions.

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Flexible foundation requirements

Rubb buildings can generally be installed on either concrete foundations or can be supplied with a hot dip galvanized steel wide-flange beam foundation (I -beam) for direct placement of the building on natural ground or on asphalt.  All factors being equal a concrete foundation is generally preferred since it provides a level, even surface and better seal to prevent water penetration.  Smaller Rubb shelters can be anchored with ground spikes or ground anchors. 

Because Rubb buildings have a flexible outer cladding and joint connection designs, the building can accept moderate differential foundation settlement.  All this means is lower concrete foundation costs for Rubb buildings than for metal or concrete block structures.  

Rubb ground anchor system

This system consists of a hot dip galvanized (to the ASTM A-123 standard) steel beam that runs continuously around the building perimeter. The beam is generally anchored using either ground anchors, ballast weights or anchor bolts into concrete. Depending upon the site conditions and foundation forces, sometimes a combination of methods is used.

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