Questions tagged [joists]

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

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3
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3answers
48 views

Can a larger joist be trimmed and have it perform as a smaller joist?

I've got a lot of 7x2 joists left over from a previous project. Now I have a new ceiling to put up but they require only 5x2 joists, so I'm thinking of trimming the 7x2 so as not to have them go to ...
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1answer
23 views

Necessary to sister joists in skylight frame?

Piggybacking on my previous question about the headers in a skylight frame (Double header for skylight frame), I'd like to know if it's required to sister the uncut joists on either side of the ...
0
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1answer
191 views

Is joist blocking safe on these old warped joists?

I purchased a house built in 1960 and like other people have mentioned the terrible bounce, I got the same exact situation. I'm thinking of installing blocking to strengthen the floor. The 7 joists ...
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1answer
128 views

Contractor cut joists short (followup to earlier question)

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 floor joists are 2x10. The joists are 2x10 ...
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2answers
95 views

Remove the wall which am not sure is load bearing wall

I have removed a stair wall but not sure if it was a load bearing wall or not. That’s a stair wall and the house is townhouse and on top floor the wall is not attached to the loft. Added a picture ...
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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 ...
2
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1answer
404 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 ...
0
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1answer
34 views

Any experience with Metwood joist reinforcers?

Does anyone in the group have experience using the following product from Metwood to reinforce joists that had to be to cut to route plumbing drains/pipes? https://www.metwood.com/product/1-...
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5answers
5k views

Is it safe to remove the bottom chords of a series of garage roof trusses?

See attached picture. Looks like an 8x10 cut-out. He wants to lift cars up so he can walk under them. Is this safe? Doesn't removing the joists affect structural integrity?
2
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1answer
59 views

What is the most cost-efficient design of a 16' temporary wooden ramp?

I need to build a 2'x16' ramp to load a moving truck. What is the cheapest design of 2x boards and plywood to do this with? The maximum load will be less than 500 lbs. I'll use plenty of 2.5" deck ...
2
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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 ...
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34 views

Soundproof Garage Ceiling

I’m building a soundproof room in a garage for a friend, after having done something similar for myself, but am not sure about the ceiling. I was planning to use two layers of acoustic plasterboard (...
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1answer
40 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 ...
3
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2answers
178 views

Run conduit perpendicular to ceiling joists in garage

I have a sub panel on a finished wall in my garage. I want to add two 20 amp circuits and run them go outlets on two unfinished walls on the sides of the garage. Is it okay to run metal conduit ...
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1answer
299 views

Removing diagonal truss brace?

Looking to put insulation, plasterboards on the garage ceiling and some down lighters, Not a massive amount of heavy stuff is currently stored there (primarily boxes etc). There are 5 joists, joist ...
3
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2answers
69 views

Joist design for shed/workshop

I am in the process of building a roughly 12' x 16' shed/workshop. It is going to be a pier-and-beam design. There are 8 concrete piers, 4 on each side, that will support 2 4x12 beams. The span from ...
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1answer
15 views

Remove damaged flooring under edge of fiberglass tub and direction of new underlayment

I am currently living in my grandmother's old house (built ~1940 or before) where I have yet to find any previous repairs done correctly. The house is a two bedroom, one bathroom mill house type ...
1
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1answer
46 views

Span calculator using arbitrary spacing?

My "new" 72-y/o house is... interesting. The garage is much younger but still I just raise my eyebrows at some things. One of them is the loft/attic area in the garage. I wanted to move all my ...
1
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2answers
367 views

How can I fix a squeaky hardwood floor in a small hallway?

Trying to fix squeaky hardwood floor in small hallway, think joists run parallel to floorboards on sides, near or under the walls on either side, can't find any with stud finder that run at 90 degree ...
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0answers
24 views

Joist span for grade level deck

I have a sunken backyard concrete patio which is sloped for drainage. The slope reduces usability for sheds, BBQs, picnic tables, etc. The space is approx 15' x 25', with concrete walls on 3 sides. ...
0
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1answer
25 views

What fasteners to sister LVL to 2x6 joist?

We live in an antique cape and have 2x6 joists. My builder is making extra headroom for a staircase in our living room which involves reinforcing a couple joists with 2x6 LVL. Which is the best option ...
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2answers
73 views

How much weight can threads hold?

I'm building a pot rack that will hang from my ceiling and I want to make sure it is secure. I rigged up a hanging apparatus that consists of a 1/2" x 12" bolt, two lock nuts, a 3/8" pipe floor ...
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1answer
76 views

Running wire through ceiling, ceiling joists blocking access to the top of the frame

So I was in my attic last night, about to drill some holes in the top of the wall to run CAT 6 ethernet cables down the wall. I found above the wall is two parallel ceiling joists that are completely ...
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0answers
25 views

How to frame corner of staircase header for a stairwell opening? Do you use a hanger here?

I'm designing a staircase and was a little curious on how to frame out the stairwell opening where the header meats the existing joists. There will be a double 1.75"(x2) LVL header joined up against ...
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2answers
178 views

Shaving a floor joist without a planer?

I have an interesting problem. I been in the process of remodelling my living room and dining room - paint, lights, floor, essentially the works. And in doing so I discovered one of my floor joists is ...
3
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4answers
14k views

How should I add new joists and flooring to a loft space?

First off, basic floor plan of the loft: Hard lines are the walls on the first floor underneath, joists on the first floor landing run left to right so does that mean the central wall running front ...
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2answers
156 views

Cut Floor joists for HVAC

I own an old home, circa 1919. In the 70's, when the new furnace was installed, they cut through the floor joists to run the air ducts. Awesome. So in direct correlation to those cut joists, are ...
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1answer
90 views

Interior wall construction - Is it possible for this to be load bearing?

I have a 2-story brick house built in 1940 with balloon construction. On the first floor, I have an interior wall between my kitchen and living room. I have done (I think) my homework, looked at the ...
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0answers
61 views

Floor Joists And Notched On Sill Plate

I have mastered many things in life, but carpentry is not one. I need to replace some flooring, and floor joist, that rotted from water damage, and it does not look like how i have seen others. The ...
3
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2answers
190 views

Joist hangers to use for rough cut 2x8 (2 3/4“ x 8 3/4”)?

I'm looking for the right size joist hangers for my project. I have an old house with rough cut oversized joists and can't seem to find a joist hangers that will work. I'm nailing into a 2x10 ledger. ...
1
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1answer
171 views

Sistering a split joist not code?

I know that building codes vary by jurisdiction so for the purposes of this question I am in Baltimore County, MD. We have a split joist in our basement. It's a 2x8, about 10 feet long. One side is ...
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0answers
62 views

How to repair cut joist around pipe *after* framing and drywall

I'm finishing my attic and have just realized that my rough carpenter screwed up by not addressing a cut joist. In photo 1, you can see that the joists have been sistered with LVLs, but there is a gap ...
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0answers
70 views

Find joists in plaster ceiling

My plaster ceiling is cracking and the advice I’ve gotten is to cover it with dry wall. The issue I’m having is how to locate the joists in the ceiling. Is there an easy way to do this to make sure ...
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0answers
39 views

Uneven floors from settling rim joist

We're trying to fix the uneven floors in our 850 sqft, 80 year-old house in San Jose. Our contractor opened up the floors and the problem appears to be that the floor joists rest on a skid, while the ...
14
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4answers
42k views

How do I meet the 7 feet high ceiling requirement after finishing the basement?

My basement ceiling joists are exactly 7 feet above the concrete slab. The requirement for finished living space is 7 ft from the finished floor to the finished ceiling. Since I'll loose a couple of ...
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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 ...
2
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1answer
75 views

Whats the best way to secure a loose flooring joist where mortar has crumbled over the decades?

My kitchen floor sits on joints that are mostly OK. One wobbles though as I walk over it near a wall. It moves 0.5cm (0.25"). I lifted a floor board and had a look. You can see the crumbled mortar ...
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2answers
87 views

How to safely attach block-and-tackle to 2x8 ceiling joist(s) to handle 1000-lb load?

I'd like to make or build a block-and-tackle in my garage to be able to lift up to a thousand-pound load (e.g. a moose). I think I have a handle on the design of a block-and-tackle and the selection ...
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2answers
148 views

Should I reinforce these joists at the central beam? If so, how?

Vaguely similar questions have been asked, but I believe this situation is unique enough that I’m looking for some specific advice. I have a floor that is framed with 2x8s, 16 O.C., spanning roughly ...
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0answers
41 views

Repairing cut wooden floorboards on either side of the main joists

How do I repair cut wooden floorboards that have been cut on either side of the main joists, as now the floor is squeaking and bouncing all of the time? I have tried attaching baton underneath with no ...
0
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1answer
68 views

Adding floor joists to an attic

I am trying to add floor joists to an attic and intend for getting decent amount of support for plywood flooring and storage. The existing truss is 13' across and 24'' span between 2x4 ceiling joists....
5
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2answers
4k views

Should I add plywood or OSB between sistered beams?

I'm going to stiffen up my main floor joists by sistering then bridging them. In the past a friend put something in the middle, is that standard? Should I put 1/2" plywood or OSB in between?
3
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1answer
1k views

Will my existing deck support the weight of a new hot tub?

I have a hot tub on my deck. I'm ready to fill it but now wondering about the weight on it. The deck is 10' wide with 2x8 joists on 16"centers. The tub is 7' x 7'. When filled with water and people ...
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0answers
48 views

spacing of steel studs for ceiling leveling

I'm renovating a single-family basement. The floor joists above the basement are 2x8 douglas fir, mostly spaced 12" OC. The basement ceiling will be finished with a single layer of 1/2" drywall. There'...
2
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3answers
281 views

Repairing cracks on deck joists

This year, being a beginner in handyman skills I decided to replace the deck boards and railings of my deck. When I bought the home about 1.5 years ago the professional who checked the house for me ...
1
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1answer
110 views

floor joists splitting at non-beam end

I'm looking for a good way to correct and arrest horizontal splitting of some floor joists where they rest on the top-plate below. The joists are 2"x8" (nominal), spaced 12" OC, and the ends away ...
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1answer
39 views

An idea to mix deflection rated I Joists?

I'm making some hypothetical blueprint ideas and started thinking about the various floor joist options. In our neck of the woods, I-Joists are by far most common with floor truss systems becoming ...
1
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1answer
298 views

Using strong magnets for hanging window blinds

I have a wide window a touch less than 6' across and I want to install a blind with 2" deep horizontals. The blind that was within my price range comes with five support brackets, which can either ...
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 ...
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0answers
48 views

How to install second subfloor?

I'm putting in 12mm floating laminate with a 4mm felt underlayment in my living room and I noticed some bowing in the current subfloor to the point where I can see it while standing up. The high ...