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Questions tagged [joists]

Horizontal support structures beneath the floor running between load bearing walls.

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34
votes
1answer
154k views

What are the guidelines for holes in joists?

I've been unable to find a good reference for the size/amount/location of holes I can drill through joists. This is mostly in order to pass cabling or pipes through the joist crosswise. Also, what ...
8
votes
2answers
4k views

Is there a limit to the number of holes bored in a joist?

I already know that a hole bored in a sawn lumber joist cannot be within 2" of any edge or any other notch or hole. And that the hole can only be a maximum of 1/3 the depth of the member (...
8
votes
4answers
4k views

Floor joists connection to eaves

Apologies if this is a duplicate. I'm attempting to floor my loft space. It currently has 47mm x 75mm ceiling joists, not enough for a floor. I am going to add something like 47mm x 200mm along ...
7
votes
3answers
6k views

Is it OK to drill vertically through a joist?

I just bought a new house and I'm looking to run some cables. One of the areas I would like to run it to would require drilling through a 2x10 sistered joist. Realizing that going through the joist ...
3
votes
1answer
3k views

Where in the span of a floor joist can I drill holes to run wiring?

How far from the end of a 2x12 or 2x10 floor joist can I drill a hole? NEC 502.8 does not give this answer, only that you have to be 2" above or below the edges, not in what part of the span it has ...
0
votes
3answers
7k views

Knee Brace support Hanger for Treehouse

I am going to be building a Treehouse soon, and am researching the best and most cost effective means to do so. I am good on the platform and beams (using Treehouse Attachment Bolts), and am going to ...
6
votes
1answer
28k views

How can I attach a ledger board to my house?

Spring is here so I finally started to take measurements for materials I will need to build a new deck on my recently constructed home. I just realized that this isn't going to be quite so simple as I ...
7
votes
1answer
5k views

How should I attach a chin-up bar to floor joists?

I want to mount a chin up bar to engineered I-beam floor joists. Am I safe to mount it directly up into it with lag bolts? If the spacing isn't correct and I span some joists with 2x4s, should I run ...
6
votes
1answer
5k views

Do the guidelines for holes in joists apply to band joists?

This question have a great answer with all the guidelines for drilling holes in joists. The question: Are the guidelines the same for band joists? A bit of context: I'd like to add an exterior ...
1
vote
3answers
6k views

How can I repair the end of joists sitting in brick pockets?

I have 2x8 joists over an 8 foot span that were eaten by termites on one end. I need to repair all of the joists in a small room. The building is double wythe structural brick that is approximately ...
16
votes
5answers
14k views

Contractor cut joist hangers to make them fit

(edited with additional info re. header) We are removing a couple of load bearing walls as part of renos in our home. The engineer specified a W8x21steel beam to replace the load bearing wall. The ...
9
votes
1answer
2k views

How do I get to the wall cavity above a double floor joist from below?

I am running some new romex for a couple of electrical outlets. One of the outlets is on one side of a wall in one bedroom and the other outlet is on the other side of the wall in another bedroom. ...
6
votes
1answer
2k views

Should I worry about sagging joists?

I have a two story house and some of the joists between the floors are sagging about an inch or two. When I walk around upstairs I can feel the level difference and downstairs you can slightly see the ...
6
votes
1answer
1k views

How do I fit a joist in this small space?

This is a follow on question from here: Floor joists connection to eaves Since this question, I have been told I need 8" joists for my span and I have exposed my eaves area to see what space I've ...
3
votes
3answers
6k views

How to hang a chair from the ceiling joists (with attic access)

I'm planning on hanging a chair from the ceiling. From what I can tell the best method is to add a crosspiece above multiple joists, and mount the chair to that using an eye bolt. The problem with ...
3
votes
3answers
862 views

Would drilling a small hole through joist / sole plate cause structural problems?

New home owner. I need to wire some ethernet and coax across the basement up into to the first floor wall. The perimeter wall is cinderblock, it is a twin and this is the shared wall. It looks framed. ...
2
votes
1answer
408 views

What's the best way to insulate an attic with 2x4 joists?

My 1938 home currently has zero insulation (aside from a few fiberglass batts haphazardly tossed about). The ceiling joists are 2x4 (spaced 16 inch OC), rather than the more modern standard of 2x6 or ...
2
votes
3answers
81 views

How to cut hole larger than 1/3 of joist?

I need to run a toilet drain (3”) through three joists (9 1/4”). Code states holes in joists can not exceed 1/3 the size of the joists. Catch is for 3” pipe I need a 3 5/8” hole — which is larger than ...
2
votes
2answers
3k views

Do I need to brace joists after removing basement ceiling?

I'm about to take out the lath & plaster ceiling in the basement of my 1908 house (I'm hiring it out; I know how bad the mess is). Main reasons for doing this are to get access to wiring and allow ...
2
votes
2answers
8k views

Is deck joist sistering a sloppy repair?

I have a few bad deck joists that I replaced with new PT joists. These repairs are great. Now I have a few more not too bad joists that will be rotted in a few years. I am thinking to add new PT ...
1
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2answers
762 views

Why are my joists smaller than standard size?

I was preparing to replace a cantilevered rim joist on my house today. I bought a 2x10 treated board to replace it. I cut a piece to use as blocking and found that the board was much wider than the ...
1
vote
2answers
20k views

What is the best way to hang a heavy dynamic weight from a flat ceiling with joists?

I want to hang something like http://www.skychairs.com/ or similar in my living room. If the joists were exposed I would mount a beam between two of them and hang over or through that. However, when ...
0
votes
0answers
682 views

Can turnbuckles hold a frame in tension?

I'm building a king-sized bunk bed using a loft/joist design. Basically, I've got (see below): slats nailed into joists joists joined to headers with blind tenons headers joined to posts with blind ...
0
votes
1answer
245 views

How to fix cracked roof joist?

I cut open my ceiling drywall to take a peek in my "attic" (about 20" of vertical space) before I go about having a skylight installed. I have a flat roof and I noticed one of the rafter/joists is ...
0
votes
1answer
41 views

Double header for skylight frame

I'd like to install a new skylight in my dining room. The skylight is 30x30 and will require one ceiling joist to be cut and (2) new double headers to be installed. Do the new headers need to span ...