Below are statements about the OneStep Building System highlighting features that make it stand out against other competitive methods of wall construction:
- OneStep walls have the strength of Reinforced Cast-In-Place Concrete
- Numerous university studies have concluded that Reinforced Cast-In-Place Concrete
provides the best protection against severe wind loads
- The Federal Government has determined Reinforced Cast-In-Place Concrete to be the
best building material for blast resistant construction
- After 9/11, the Pentagon building was retro-fit with reinforced Cast-In-Place Concrete
- Able to withstand extreme wind loads
- Excellent bullet and blast resistance
- Four Hour Fire Wall Rating
Although a wall built with OneStep looks like a masonry wall, the workhorse of the wall is the concrete fill and steel reinforcement bars in the inner wall cavity.
Recent wall-panel flexure testing of OneStep wall panels at the National Concrete Masonry Association's test lab facility in Herndon, Virginia revealed that 12" CFMU wall panels (with the resulting 7 1/2 inch concrete mass) are as strong as comparable cast-in-place concrete walls.
The OneStep wall used in the panel test had the following material properties
(based on tests, as per ASTM C90, C140, and C426):
Unit Comprehensive Strength (psi) 5100
Absorption (pcf) 8.9
Density of face shells (pcf) 131.1
Linear Drying Shrinkage (%) 0.031
Mortar Compressive Strength (type S pcl) (psi) 3253-3457
Grout compressive Strength (psi) 3520-3610
Grout Slump (in.) 10
Masonry Prism Compressive Strength (f'm)
Ungrouted (psi) 3247
Grouted (psi) 2821
Calculated via allowable stress method, maximum axial load values for a non-reinforced CFMU system for an 11-5/8" CFMU wall panel (with the standard 7" structural member) based upon 1.5" of eccentricity from the centeroid of the structural section to point of load application; axial loading only- no lateral loads.
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The OneStep Building System provides the security and strength of cast-in-place concrete and includes hurricane straps which anchor the roof trusses securely to the concrete, which provides tremendous wind resistance.
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