Framing a Crawl Space Underfloor | Paul Rea

Tim Olguin
Tim Olguin
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Published 2022-03-03
Paul Rea teaches how to frame a "crawl space" underfloor for a residential building using traditional 2x10 joists. He shows the components of the underfloor including the mudsill, vapor barrier, anchor bolts, joist hangers, and pony wall. He also discusses why pressure treated lumber is used for the mudsill and where to put the crawl space access to the underfloor. See actual video of mudsill installation, joist hangers installed, and the sheeting of the subfloor. The building is a Single Family Residence with an attached Accessory Dwelling Unit (ADU) located in Springfield, Oregon. Paul Rea is a Construction Technology professor in Oregon at Lane Community College.
All Comments (21)
  • @brianwalters7272
    Excellent and very in depth video! You have a knack for teaching!
  • @Borgenscalle
    Over here in the Nordics, many houses in the 60s and 70s were built with pressure treated sills which begun smelling after a few years and nowadays regular wood is preferred. Perhaps other chemicals are used these days that won’t smell as bad.
  • @hedge685
    Just a suggestion, Tim...try to balance the audio level, the commentary is quiet and the music is quite loud in comparison.
  • @flyingrhoads
    Please let me know why you use hangers for the joist instead of putting the joists on top of the sill? Thanks. I’m just learning
  • @niveknospmoht8743
    One thing you didn't mention is that the engineered I-joists are a firemans nightmare. BTW I have never seen a floor system framed like the one I see here. joists have always been on top of the sill
  • @joshuajackson8112
    Thanks for video is there any advantages to a engineered floor joist truss system in a crawl space home? Possibly doesn’t twist or bend at all limiting squeaks or things of that nature? Other than cost but would that be “overkill” in a raised foundation home vs the 2 x 10s? Thanks again!
  • @Lordlll
    Hey! Are these Simpson strong tie hangers? What type? Thanks
  • @vswebster
    What kind of PT lumber is that with all the lines in it?
  • @RICK-uf1jj
    Unfortunately my few years framing experience was mostly building on slabs but any joists or decking...where decking falls and fastened to middle of the 1 1/2" joists, how do you accomplish this with your staggered joist at center girder......sheet would fall short or long or is your distance to center an even 8,12,16, if not you'd need to notch out every 4x8 at this shift.The diy audience that this video is directed to would run into problems with this. The overlap at girder should give cantilever strength and lengthen the joists span but none of online span charts address this. I'm aware that engineering a build is smart but with so many tutorials online many who aren't required to pull permits aren't.
  • @jayframes4967
    What's wrong with actually bearing the joists on top of the foundation wall?
  • @nickntab09
    hmm pt can still grow mold i was told....... idk