Can I Attach a Deck Ledger to 1-1/8" or 1-1/4" Trus Joist® Rim Board?

Yes, a deck ledger can be attached to the TJI^® floor system that contains either 1-1/8" or 1-1/4" or thicker Trus Joist^® rim board. Below are details taken from our TJI^® floor system specifier's guide that provides allowable lag and through bolt values for both rim board thicknesses to support vertical load from a deck. It is important to note that starting with the 2009 edition of the International Residential Code (IRC), an exterior deck must also be laterally connected to the main structure in at least 2 locations with a tension tie capable of withstanding a minimum of 1500 lbs (see “Deck Lateral Load Connection to a TJI Floor System” for more information).

The following links provide additional information on deck ledgers, lateral connections and deck design: –

Trust Joist® Rim Board TJ-8000 – See page 5 for additional information, including details shown above

FAQs on designs on decks – Blog on deck design

TB -304 – Technical bulletin discussing deck ledger attachments

Prescriptive Wood Deck Design Guide-American Wood Council