Wood Framing Ceiling Joist Laps Connections - Home Building Tips

[gregvancom]

@magexx9 Yes, it definitely would throw the layout off, but it will only throw it off for a few feet. You will need to switch your plywood floor layout, before or after the lap, depending upon which will work better. Simply nail a scab or scrap 2 x 4, to extend the lap, in the preferred direction. Sounds like another video to me, I will see what I can do.

[gregvancom]

I guess it takes one to know one and thanks for watching the videos.

[RagedContinuum]

My grandfather's house has shallow joist lapping which spans between the exterior walls. There is x-blocking between the joists and I can walk on them individually without any noticeable deflection. They've held up for 70 years but I am concerned about future give-aways. Any suggestion on how I can reinforce them? They seem to be oak wood.
I would like to add plywood flooring which should help distribute loads and provide additional torsion and compression resistance, but I doubt that it would suffice for any heavy loads on top of or suspended by them

[trinifirst]

I have a carport on one side of the wall and plan to replace all the rafters which are joined on the wall as your image shows...how do I nail them together in this rather limited space?
Do you use a special type of nail gun?

[redsresearch]

can you put a floor on ceiling joists in the attic without rim joists?

[gregvancom]

@magexx9 It would depend on the size of the strap, but wouldn't be cost effective and could create floor nailing problems. If you install a strap on top of the joist, you would have a problem nailing the floor sheathing.

[ex]

With joists offset, how do you align the roof rafters?

[edgararcega]

Anybody know how two 4x4 8 foot long pieces of lumber can be jointed together for a shed base application?

[gregvancom]

I really don't know, but it happens often. However, I do remember this situation. A woman contacted me and sent me a couple of pictures of a large floor to a home that was being framed without metal hangers. When I provided her with the information she was looking for, I never heard from her again and thought that was strange, because she sounded so grateful.

[Steven-wmvu]

Very basic question. Wouldn't you want blocking here too? So maybe something like you said - four nails on each side. Then have blocking offset between each lap. So then you have nails in the center also going through both joists into the block. And the blocking keeps it all nice an separated.

[anon]

Love your videos. We just bought a 1950's, single level ranch style house with a low pitch Gable roof with really long soffits. We're in Florida so no doubt the house was designed for rain and hurricanes (2 weeks after moving in we got to experience hurricane Matthew full force and the house was brilliant)

The house is shaped like an L and in the front section of the house, smack in the middle parallel to the roof-line, there is a small bulge / cracking in the ceiling running longitudinally from wall to wall. After a little deduction it looks like there may have been a load bearing wall there at one point. And the house being built in the 50's, it's probably safe to assume that's where lapped ceiling joists were resting. The section of missing wall does not extend the length of the house, only about 1/3 but smack in the middle.

I'm planning on partitioning off that area of house for a laundry room and guest bathroom BUT my wall line is going to sit about 2" off center of where the original "wall" probably was.

In your experience and opinion, are there any tricks I can use to make the new wall load bearing or will I be forced to employ a hidden beam above the joists?

on a side note, I've been watching a lot of videos where people are using LVL beams and CUTTING the lapped joists so they can hang them off the LVL - doesn't that defeat the purpose of lapping the joists? Isn't there a shear load that pushes and pulls laterally or is that dependent on the roof type? (which would be the part of those videos not explained)

[DRJMF]

Doing a low budget roofing job for my shed. Can 4x2 or 6x2 rafters be joined like this ? My wood is in 2m lengths but my span is 5m. It’s only a tin roof but I wanted to connect the short timbers for maximum flexural strength. Not interested in cosmetic look, or is there a better easier way to connect two timbers end to end eg bracing with side plates ? Thanks.

[johnraffensperger]

Hey, thanks for this, great video. Question: I have a problem with the joists overlapping in the basement. probably due to the joists sagging a bit, the ends are poking upwards and making the floor uneven. Any suggestions? Can I just shorten the ends, or should I use wedges?

[SkilsawDoctor]

I am looking for a little guidance with this. How do you layout for the lap on the rim joists to allow for the plywood to break o/c from both sides of the beam. I am told to layout the same just put the joists on opposite sides of the line. Wouldn't this throw off the 48" o/c spacing for the subfloor?

[osajohnson]

Hey it's been awhile since you answered questions but I'll take a chance that you may be able to answer me. I'd like to make joists to cover a span of 18 feet over an old inground pool so I can make it a deck area. Thoughts on the way to do this?

[danb]

Question-I looked at the laps in my attic and they are not on top of a wall, rather about a foot away from the wall. Is that an issue? Thanks

[gregvancom]

@magexx9 That would be a better possibility, just don't forget that you would only be nailing into an inch and a half, which could leave you with a bunch of nails sticking out of the other side. Some structural engineers won't accept this and would require you to nail through the top, allowing you to use longer nails.

[RealMrBitstream]

I saw a diagram once of the butt joint option where there’s a separate splicer, 4’ long, 4 nails per side. This allowed your layout to be consistent rather than shift. Emulating one solid piece of lumber (only over a load bearing wall of course). Curious if anyone has seen this in the wild or in prescriptive IRC code / diagrams.

[joshuasmith]

So when you put up your rafters, they don't line up on either side of the ridge board...and that's not a problem, correct?

[gregvancom]

I'm not exactly sure what you're talking about, but anytime you can add additional joist and tie it to another section of the framing, you will be improving the structural strength. Feel free to send me a picture or provide me a little more detail of what you're doing, if I didn't answer your question.