Compression or Tension Web Configuration—Which is Better?
On a recent Quality Assurance Audit at a large facility, we witnessed a floor truss builder carefully spacing out his floor truss webs in the allotted space available with precision and care. He was very meticulous. I asked him why he was doing that and he explained that his in-house inspector...
The Missing Link – Addressing Roof Ponding by Designing with an HVAC Perspective
As discussed in last month’s article, “Addressing the Roof Truss Design Note: 'Provide adequate drainage to prevent water ponding.’,” by Frank Woeste and Scott Coffman, ponding is an issue not always addressed adequately.
Ponding is a design issue, a mishap, or an...
All Things Wood:
Addressing the Roof Truss Design Note: “Provide adequate drainage to prevent water ponding.”
The purpose of this article to examine the significance and implementation of a typical note that appears on metal plate connected roof-truss drawings when a top-chord-pitch of ¼:12 or less is specified by the Construction Documents. Three questions will be addressed:
What is the...
Errors in Substituting Dead Load for Live Load in Wood Design
Custom kitchens, with high-end appliances, granite countertops, and central islands, are becoming more and more prevalent in the home market today. These products and finishes are heavy and the dead loads from the central islands and/or cabinets positioned along interior...
When Fashion Affects Structure—Floor Design Considerations for Preventing Tile and Stone Cracks
Two kinds of designers are involved in home construction—design professionals responsible for the structure and the interior-focused designers responsible for the final appearance. Although these roles can overlap, it is important for design professionals to be aware of in-service demands...
What Building Professionals Need to Know About Construction Loading
Understanding construction loading is important as it relates to the acceptable practices in terms of staging and storing construction materials prior to installation. What does “construction loading” mean? This term describes materials and people that are present during the course...
All Things Wood:
The Pioneer of MSR Lumber
The knowledge we take for granted today on MSR lumber is due in large part to the pioneering work of Professor Robert Hoyle, P.E. In the early 1960s at Potlatch Forest, Inc., he conducted basic research on the relationship between stiffness and strength of lumber, paving the way for the MSR...
Accommodating Truss Movement (Besides Vertical Deflection)
Vertical deflection resulting from live and dead loads – of both roof and floor framing components – is an important serviceability consideration in the overall design of the building. And while this could be a topic in and of itself, this article is instead going to focus on two...
So What is the Big Deal About Member to Member Gaps?
Compliance with ANSI/TPI 1–2014 requires maintaining member to member gaps at less than 1/4 inch. An exception would be for floor truss chord splices where the limit is 1/16 inch.
Let us take a look at two different situations, the first being a roof truss and the second being a 4 x 2...
All Things Wood:
How to Predict a Bouncy Floor
The model International Residential Code (IRC) permits a design live load of 30 psf for “sleeping rooms.” The model codes specify 40 psf for all other rooms. Of the annoying floor vibration complaints we have received, the most common scenario stems from the use...