SBCA Scientific Research Reports
SBCA Research Reports
Sealed Truss Placement Diagrams - California
It can be often misunderstood whether Truss Designers have the responsibility to seal a Truss Placement Diagram (TPD). The purpose of this Research Report is to provide the relevant code sections from the International Building Code (IBC) and the California Building Code for a thorough analysis and interpretation.
|Design Documents, Engineering, Scope of Work|
Cantilevered Sill Plates: Use with Wood Trusses to Align with Varying Thicknesses of Exterior Sheathing
The prescriptive residential energy code requirements found in the 2009, 2012 and 2015 International Residential Code (IRC) include requirements for continuous insulation at foundations in several climate zones. This Research Report discusses the issue of cantilevered sill plates supporting metal plate connected wood trusses installed parallel and perpendicular to the foundation walls where there is a potential for discontinuous planes between the exterior wall above the sill plate and the foundation insulation planes.
|Floor Trusses, Loads|
Lay-On Gable Connection: An Analysis of a Toe Nail Connection Visible After Sheathing is Installed
A lay-on gable frame is typically connected from the top during truss placement, but after sheathing is installed, this connection is no longer visible for the building inspector to verify. This creates a need for an alternate connection that is visible from below. The goal of this Research Report is to analyze a simple, cost-effective, toe nail connection between the lay-on gable frames and supporting truss system that is visible after sheathing is installed.
|Roof Trusses, Connections, Loads|
Sprinkler Loads on Trusses
Building Designers need to account for the dead and live loads of fire sprinkler systems, in addition to the other load requirements imposed under the model building codes. Truss Designers are responsible for incorporating the additional load from the fire sprinkler systems into the truss design. The information in this Research Report is applicable to both floor and roof systems. Only vertical loads from fire sprinkler systems are discussed; lateral loads, where required, should be evaluated separately by a Registered Design Professional.
|Fire Codes, Loads|
Resilient Channel or Hat Channel: Use to Meet the Lateral Restraint/Bracing Requirements of the Bottom Chords of Wood Truss Floor Systems
Minimum top and bottom chord permanent lateral restraint/bracing of structural roof or floor trusses is assumed to be adequate when using code-compliant roof and/or ceiling diaphragms. This lateral restraint/bracing is typically accomplished with code-compliant roof /floor sheathing and fastener spacing and/or code-compliant gypsum ceiling material and fastener spacing or purlins at a given on-center spacing.
|Bracing & Restraint|
Inspection & Quality Assurance Requirements for Wood Trusses per IBC/IRC
This Research Report provides a clear perspective on truss plant quality assurance and third party inspections as they relate to the requirements developed by the International Code Council (ICC) within the International Building Code (IBC) and the International Residential Code (IRC). The same perspective outlined in this Research Report should be applied when discussing how all structural building component third party inspections relate to Chapter 17 special inspection requirements.
Conventionally Framed Roofs & Roof Trusses: Code-Compliant Construction
This Research Report reviews pertinent sections of the 2006, 2009 and 2012 International Residential Code (IRC), the 2012 IRC Commentary, and additional sources in an effort to compile the related data and identify discrepancies or omissions. The focus is catered toward meeting and better understanding the requirements for conventionally framed roofs and roof truss construction per IRC Section R802.
|Bracing & Restraint, Roof Trusses, Connections, Construction, Products|
Deck Ledger Attachment to Residential Wood Truss Floor Systems
This Research Report provides construction details for residential deck ledger attachment to metal plate connected wood truss floor systems. Proper attachment of the deck ledger to the house is critical for ensuring that an “attached” deck is safely and securely supported at this location.
|Connections, Engineering, Construction, Design|
Use of “L” Type Partition Intersections in Fire-Rated Assemblies
This research report evaluates the use of L-shaped partition intersections as an equivalent alternative to the Ushaped intersections typically shown in fire-resistive assembly evaluation reports.
|Fire Resistance, Performance|