Roof and Floor Truss Design


Sterritt Lumber will help you determine your truss design costs in advance, so there’s no guesswork. Your site erection time will be greatly reduced and losses from job site material shortages and theft are eliminated. Every truss is individually designed and that design is checked and approved by licensed engineers for structural adequacy. Trusses provide more design flexibility, inside and out, than conventional framing. Sterritt Lumber can offer numerous design options; our trusses present an economical and structurally superior method for the rapid erection of your next project.

Benefits of Roof Trusses

• Complex roof and ceiling profiles are easy to design with today’s software.

• Hip and valley roof systems are much easier to build using trusses than with conventional framing.

• Trusses can be used with a variety of on-center spacing, to optimize strength and lumber resources.

• Long, clear spans are easy to create, reducing or eliminating the need for interior bearing walls, beams, and columns.

• Structures are dried in more quickly, saving time and avoiding weather-related delays.

• There are almost no limitations when you design with trusses.

Benefits of Floor Trusses

• Floor truss installations create high quality, squeak-free construction with the added benefits of reduced framing time, waste, pilferage, and callbacks.

• Design versatility and open web spaces are tremendous advantages to builders of today’s complex and sophisticated homes.

• The fact that floor trusses are built with 2x4s or 2x3s oriented ‘flatwise’ means a wide, stable bearing surface that is easier to work on and around.

• The wide nailing surface provides for easy gluing and quick, accurate attachment of sheathing, reducing squeaks and improving floor performance for the life of the structure.

• Spacing floor trusses at 19.2” or 24” o.c. maximizes structural efficiency and speed of installation.

• Stiffness and strength can be designed into the floor truss, creating a more solid floor.

• Special bearing, cantilever and balcony details are easily built in.

• Shrinkage, warping or twisting are minimized, reducing the potential for callbacks to the job site.

• Long span and girder truss options reduce the need for intermediate bearing walls, beams, columns, or footing, saving time and construction costs.

• The open web configuration leaves plenty of room for plumbing, electrical, and mechanical runs.

• Typical depths for floor trusses are 12” to 24”, but shallower or deeper configurations are possible.

For Architects/Developers

• Savings on design costs, one basic structural design for shell with minor floor plan variations

• Better project cost control, with component costs known in advance

• Better cash flow with earlier occupancy due to reduced on-site labor

• Faster shell completion time

• Using trusses of smaller dimensional lumber, in place of beams and columns

• Greater flexibility in locating plumbing, duct work, and electrical wiring

• Floor plan freedom in locating interior partitions often without additional support required

For Contractors/Builders

• Pre-determined, pre-engineered truss system

• Fewer pieces to handle and reduced installation time

• Wide 3-1/2” nailing surface for easy floor deck application

• Eliminate notching and boring joists for electrical wiring and plumbing

• Floor trusses offer better availability and less in-place cost than conventional joists

• Factory-manufactured components to exact span requirements

• Reduced HVAC, plumbing and electrical subcontractor time on job

• No column pads to pour, no steel beams and posts to place

• Job site material theft and cutting waste reduced