Design Assistance

With over 120 years of combined experience in the engineered wood business our team is dedicated to providing the most economical floor or roof system available. We are available to help design your roof or floor system from the early design stages or as a value engineering solution if needed. We provide specifications, stamped calculations and layout plans when requested.

To help specify the engineered wood products below is a check list that outlines the information that should be addressed during specification:

Check list for specifying Engineered Wood Products

Verify the following information is clearly shown on the contract documents.


  • RShow all applicable occupancy (live) loads relevent to project. Office, Corridor, Storage, etc…(Show loads per ICC in General Structural Notes page)

  • RShow dead load of structure – specific to floor and roof

  • RSnow Drift – Mark as not required, Included in flat roof snow load, or Provide drift diagram.

  • ROther Loads – Axial/Seismic, Parapet brace, Mechanical screen, Towers, Hanging walls, Sprinkler lines greater than 3” shown on plans, details, or in structural notes

  • RUplift – Note net PSF uplift or an uplift diagram showing the discontinuity.

  • RMechanical – Coordinate weight & location specifically or Provide a mechanical zone allowance and location (this will provide more flexibility for future mechanical units).

  • ROffice Loading – Design for live load of 100 PSF to accommodate future corridors anywhere on the joists (increases cost).

  • RSprinkler loading – Add 2 PSF to the dead load for an allowance.

  • RRequire that all of the loading above is clearly shown on the shop drawing


  • RShow all shafts, Roof access, Openings, in structure. Note on plan “Joist MFR to design support for openings”.

  • R2 hour walls & shafts – There are 3 accepted solutions:

    • Frame single wood wall and provide solid blocking which is the full width of the stud then use face mount hangers to support framing off of the blocking.

    • Use a double wall. The inner wall is the free-standing rated shaft wall. The outer wall is a structural wall for the floor and roof structure.

    • Use a concrete or CMU rated shaft wall and hang floor and roof structure off ledger


  • RBeams – Specify beam hanger or show the load required.

  • RJoists – Note hanger per Manufacture.

  • RMake sure the wood plate on the steel beam is thick enough for hanger nailing.


  • RNail spacing closer than 3” OC needs to be staggered.

  • RBe sure to specify the correct strap nailing per strap design guide.

  • RIf nailing is required closer than 3” OC R-Chord can be used (See SSI Design Manual).

Specifying Performance Based Design Criteria


    • Keep span (inches) / Depth (inches) ratio to 12-15.

    • Limit LL def. L/600 (1/2”) most loading conditions.

    • Limit LL def L/480 for Corridor, Storage, or other highly loaded areas.

    • Limit TL def L/240.


    • LL def L/360.

    • TL def L/240.

    • No camber – For long spans limit total deflection with stiffer joist.

Commercial Commercial Residential Residential
Live Load Total Load Live Load Total Load
Floor L/600 L/240 L/480 L/240
Roof L/360 L/240 L/360 L/240
Optional Limit deflection to 1/2″ Limit deflection to 1/2″


  • RWeb Stiffeners – Note on detail that Web Stiffener as required by Manufacture. Show detail where fillers are req’d such as Hold downs, Straps, Outriggers, etc..

  • RSpecify axial transfer that is required at bearing.

  • R Show any braces and their attachments/loading.

  • RUplift bracing to be designed by MFR.

  • R Web Filler for a hold down up to 10,000 lbs (See SSI manual).

  • ROpen web truss shear block for lateral tie (See SSW manual).

  • ROpen web truss Skew bearing block may be required.

  • RDesign hold down clips at bottom bearing I Joists.

  • RColumn interference detail when appropriate.

  • R Make note if product is exposed and the owner would like Architectural grade.

Download Checklist – see attached