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Defense Against Water

What is the rainscreen concept for an exterior wall? The simple definition is that the concept provides a secondary line of defense against water, in both its liquid and vapor state, from penetrating...

Allowable Drift

Can you explain allowable drift in seismic design? The design of buildings to resist seismic events is regulated by the International Building Code. The standard that is referenced within the code is ASCE...

Allowable Drift

Can you define allowable drift and how it affects a contractor? Drift is the lateral movement of buildings caused by wind or earthquakes. According to Don Allen, P.E., S.E., director of engineering at...

Waste Not, Want Not

Can you explain changes to construction waste recovery? Statistics reveal that a copious amount of waste material is generated during the construction, renovation or demolition of a building. There is a heightened...

Panelized Construction Standards

Can you explain the new standards for panelized construction? New standards may soon impact all contractors involved in pre-building panels to be installed on a construction site. Two of these standards, from the...

Heat-Related Illness

Can you explain OSHA’s involvement in heat-related illness? Heat-stress continues to be a concern of the Occupational Safety and Health Administration, and the agency has recently entered a preliminary rulemaking stage. OSHA published...

CFS Design Considerations

Please explain the connection between head-of-wall fire resistive designs and composite design for non-structural cold-formed steel framing. The connection between the two is that potentially there is no connection between the two. The...

New Standard Explained

Please explain the new AISI S250. This new standard is titled “North American Standard for Thermal Transmittance of Building Envelopes with Cold-Formed Steel Framing.” The standard is recognized as an ANSI Standard, meaning...

NFPA 221 Defined

What is NFPA 221? This is an NFPA standard that was drafted in 1994 and is now ANSI’s Standard for High Challenge Fire Walls, Fire Walls and Fire Barrier Walls. What makes...