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2021 March

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...

2021 February

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...

January 2021

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...

2020 December

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...

2020 November

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...

2020 October

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,...

2020 September

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...

2020 August

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...

2020 July

Air Leakage Testing

Q: What is air leakage testing on exterior walls?? A: Air leakage testing is now an energy code requirement which focuses on the performance of the exterior envelope. It is cited in both...