Framing a Crawl Space Underfloor | Paul Rea

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.

[brianwalters]

Excellent and very in depth video! You have a knack for teaching!

[carolsacher]

Thanks for finally answering my question of "Where is the access?" I never would nave thought of it being from the inside.

[niveknospmoht]

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

[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.

[capedcrusaderforbuilders]

Need to size and place the isolation membrane piece so it protects the hanger from the PT sills, AND protects the ends of the NOT PT floor joists from the concrete walls.

[ericswallick]

Several things mentioned previously, and I ask the same.
Perhaps the structure has a height consideration and thats why floor joists are Not on Sill or mud plate.
A few others ask same and other points.

[hedge]

Just a suggestion, Tim...try to balance the audio level, the commentary is quiet and the music is quite loud in comparison.

[paulkelly]

Funny how framing is regional. Here, the floor joists would sit on the sill plate, surrounded by a rim joists, and overlapping at support girders.. double joists under wall plates.

[jakew]

i noticed the mudsills with the joist hangers were flush with the interior of the stem wall, but the mudsills that didn't have joist hangers were flush with the outside of the stem wall. and they also looked like they might have been a smaller dimension. am i seeing things right? what's the reason for these decisions?

[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

[TrendyStone]

I-joists are nice because they are do dimensionally consistent. If you don't want squeaks...build on a concrete slab! Otherwise, I-joists installed carefully are the next best option.

[stanmarr]

So...if the pressure-treated timber is corrosive to the joist hangers; won't it also be corrosive to the nails? And wouldn't it have been a more stronger application if the joist hangers could be attached to the walls instead? I mean..are 6 nails really good enough to withstand all the weight that will be loaded onto those joist hangers? Asking for a foreign friend😮

[kitchencomputer]

No DPC? Why not use the stem wall to support the floor joists?

[joshuajackson]

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!

[miked]

do u layout anchor bolts so they don't hit a joist location?

[Lordlll]

Hey! Are these Simpson strong tie hangers? What type? Thanks

[Sandramce]

I bought a place with a foundation, but one problem: someone cut the anchor bolts, and I don't have a clue what to do about this situation .how do I put in new anchors?

[jayframes]

What's wrong with actually bearing the joists on top of the foundation wall?

[RICK-ufjj]

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 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.

[bobsondugnutt]

lmao i like the edginess of the builder