Combining fiber reinforcement with finger jointed lumber could be a win for both the lumber and component industries.
With in-line framing, CMs can remove studs and plate material, and spread the stud spacing out to 24", which, in some cases, allows for better insulation methods.
The key to new product development is generating sales revenue immediately by establishing design values and engineering reports that give assurance of the product’s equivalent code-compliant performance.
The truss industry follows the requirements of the building code and ANSI/TPI 1 for general project scope of work concepts.
The Truss Designer identifies the location of required individual truss member lateral restraint and diagonal bracing on each Truss Design Drawing.
The JOBSITE PACKAGE can prove invaluable in documenting that the CM provided industry best practices on truss bracing, particularly when a project goes in a bad direction.
Applied loading take-offs are critical to truss design efficiencies.
Communication between the Truss Designer and Truss Design Engineer is key to minimizing truss design inaccuracies.
The SBCA Load Guide is a free tool that can help Building Designers and everyone involved in the truss design process ensure that the applied loads are correct.
A repair may not be needed if, after adding the holes, visually graded lumber still meets an adequate grade according to the appropriate grading criteria.
The Combined Stress Index (CSI) is the summation of axial and bending stresses divided by their respective allowable stresses, which represents the structural “efficiency” of the member; the CSI shall not exceed 1.00.
Coordinating with trades before construction is a good way to avoid holes and notches in trusses, and the costly repairs associated with them.
Field splices provide a means of connecting two truss sections together creatively at the jobsite, to allow manufacturing, shipping and installation greater flexibility in serving customer needs.
A field-spliced truss should be designed as one component so that the proper load transfers at the splice.
Correct installation is important to avoid increased deflection of the field-spliced truss and potential long-term serviceability problems.
The contractor should examine the trusses when they are delivered and determine if there is any damage that would impair the structural integrity of the trusses.
BCSI recommends that trusses stored outside for more than a week be stacked on blocking and have a cover that provides adequate ventilation.
The contractor is responsible for the construction means, methods, techniques, sequences, procedures, programs, and safety in connection with the receipt, storage, handling, installation, restraining, and bracing of the trusses.
When comparing the energy efficiency of cold-formed steel and wood components, the R-value and U-factor are a good place to start.
The R-value measures thermal resistance; it is the inverse of the time rate of heat flow through a building thermal envelope element from one of its bounding surfaces to the other for a unit temperature difference between the two surfaces.
The U-factor measures thermal transmittance, the coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films.
The exception to IRC Section R602.3.2 allows for the use of a single top plate in a wood stud wall if the design meets specific requirements.
By cutting the volume of lumber in the top plate in half, a single top plate allows more space for insulation and can reduce thermal bridging through the lumber, which increases the thermal efficiency of the wall system.
When trusses are centered over the studs with a tolerance of not more than 1", the stud spacing can be increased to 24" o.c., which removes more lumber, improves energy efficiency and still provides a continuous load path.
To determine if the use of a single top plate is beneficial, a number of factors must be weighed.
