Mike Lamb Posted May 14, 2018 Report Share Posted May 14, 2018 This lumber is being used for an outside deck. It looks like standard construction grade and nothing that should be used outside. Do these stamps determine location use? I did a quick walk-by and will look at the house tomorrow. Typical pressure-treated lumber is tagged at the end of each piece with treatment info. Link to comment Share on other sites More sharing options...
John Kogel Posted May 14, 2018 Report Share Posted May 14, 2018 I think you are right, no mention of pressure treatment in those stamps. HT stands for heat treated. Link to comment Share on other sites More sharing options...
Trent Tarter Posted May 14, 2018 Report Share Posted May 14, 2018 As far as I know there's nothing stating that it cant' be used. It just needs to be well stained and sealed. I see quite a few decks built with untreated wood, personally I would use treated wood for the joists and beams. Link to comment Share on other sites More sharing options...
Jim Katen Posted May 15, 2018 Report Share Posted May 15, 2018 It's required by the IRC in section 317.1 Link to comment Share on other sites More sharing options...
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