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Thermal Bridging

Q: Can you explain the concept of thermal bridging and its current impact for the contractor? A: Codes and standards are now looking at curbing the negative effect of thermal bridging, which will...

IBC Changes Regarding Exterior Cement Plaster

Q: Can you explain the recent changes in the International Building Code regarding exterior cement plaster? A: The 2021 version of the IBC has significant changes relating to the application of cement plaster...

Forces vs. Walls

Q: Can you describe the difference between material and geometric properties relating to the structural capacity of wall systems? A: The structural capacity of any product or system is a function of the...

Virtual Inspections

Q: What is a virtual inspection? A: Construction inspections have evolved over the last few years. Traditionally inspections were conducted by the staff of the authority having jurisdiction. In most cases and relating...

Control Joints in a Fire-Rated Gypsum Assembly

Q: How do I install a control joint in a gypsum panel ceiling that is part of a fire-rated assembly? A: Gypsum assemblies need to allow for movement in all conditions, including structural...

When the UL Design Disagrees

Q: I have a project where a fire rated gypsum panel ceiling must be installed at a different elevation than what is listed in a UL design. What can I do? A: Before...

Perimeter Relief

Q: What is meant by “perimeter relief” as it relates to gypsum panel ceilings? A: The term “perimeter relief” is used in ASTM C840, Standard Specification for Application and Finishing of Gypsum Board,...

NFPA 285’s Effect on Contractors

Q: Can you explain recent changes to the National Fire Protection Association test standard known as NFPA 285, and how they might impact contractors? A: Over the past few years there has been...

Water Migration

Q: Can you explain the principles of controlling water migration through exterior walls? A: This is a fairly complex topic and one that has caused significant changes in the model building codes. Not...