Questions tagged [joists]

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

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Are my ceilings and flooring going to cave in?

Bought house a year ago. I can feel the wood upstairs has moved. Some areas sag bad, others the wood has lifted. The ceilings on first floor below have cracked and I can see the indentations all over. ...
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Is best practice to discharge sump through cinder blocks closer to ground, or through wood plate higher above ground?

I have a sump pump that needs to discharge outside. Next to the sump is maybe 9ft of cinder blocks for the basement wall, but in this side of the basement, ground-level is just 4ft higher elevation ...
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Unable to drill through second story subfloor

I have squeaky floors on my second story. I bought one of those repair kits with the tool that helps find the joists through carpet. Wherever I drill, no matter which room or what distance I move ...
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8 votes
1 answer
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Long crack in I joist flange

Found a nasty crack in one of our I joists and need advice. Should I get a structural engineer over here asap or try to repair it? It’s over a foot long. Our shop was built in 2020, so I’m surprised ...
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How many posts do I need for flat ground level deck

I want to build a flat ground level deck approx 25x26ft. I have very limited space between the ground and the door, so it needs to be streamlined. I plan to use 3 26’ 2x10 as primary frame supports ...
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Raising Sunken living room - Load concern

I want to raise the living room so it is level with the rest of the house. I have all the dimensions and how I will be doing it. However, I am concerned about the load as there is a basement below. ...
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Timber-timber joists joined in an unusual way?

I have an upstairs room that I am renovating in a loft-converted house, having recently moved in (UK). The house is from the 1950s, and was originally a 1-story house without the loft. It was upgraded ...
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2x6 as floor joist

I am going to be replacing the subfloor in a room, but just noticed that the exiting joists at the end wall (room getting new subfloor is a dining room, room next to it is a bathroom) end at ...
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1 answer
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Maximum Span of Deck Joists [closed]

According to the following, a deck using 2x10" joists, spaced 12" apart, can have a span (distance from attachment to house to row of footings) of 16'. https://www.decks.com/how-to/articles/...
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Will these floor joists support a new soaker tub installation?

I am installing a 3ft. X 6ft. soaker bath tub that will weigh almost 1200 lb. dead weight when filled with water. The tub will be parallel to two existing 2x10 floor joists that have a 11ft. 3in. ...
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Is this a load-bearing wall?

This house has 2 5/8" x 8" (true dimensions) floor joists on 16" centers spanning roughly 23' on the first floor. The house is 2 stories with a 50 PSF load. There is a wall in the ...
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4 votes
1 answer
223 views

How to repair this split ceiling joist?

While installing some new recessed lighting in my attic today, I noticed this split in one of the ceiling joists. The split is about 4 ft 6 in long starting from the end of the joist. The joist is a ...
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How do I remove the bottom chord from a shed roof, the right way?

I've got a 16' (length) x 10' (width) saltbox-style shed that I'd like to convert into an office. The roof is supported by simple triangle trusses of 2 x 4's. Each of the trusses is cantilevered out ...
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Should I use solid lumber or plywood to repair a floor joist?

Is it better to sister a 2x8 floor joist (cracked somewhere in the middle) using same size lumber or is something like 3/4 plywood better? Consider that both ends of the newly sistered joist won't ...
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How to support subfloor because of gap between floor and joist

There is a beam that runs down the center of our house (in the basement). Floor joists are hung on both sides of this beam. On one side of the beam there are gaps between the subfloor and joists (...
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Sister i-joist for subfloor install?

I am doing a small bathroom remodel that turned big...now replacing a 4' by 4' section of subfloor thanks to discovering surface mold on the subfloor (no rot). The joists are 16" on center and lo ...
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How to screw drywall ceiling with furring [duplicate]

I am adding a drywall ceiling to my basement, and it already has 1x3 furring spaced 12" apart. I am planning on using ½x4x8 drywall sheets. When screwing my drywall, is it best to screw only in ...
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3 votes
6 answers
1k views

Small cracks in I-Joist bottom flange [closed]

I have noticed 3 small cracks over a a span of maybe 6 inches in one of my I-joists' bottom flange. It's ironically only on one side. I suspect this is triggered by the top flange which has a ...
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2 answers
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Repairing termite damage floor joist

I have some old termite damage to the end of a 2x12 floor joist. One end is sitting on a metal beam running along the centerline of my two story house (that sits on the foundation walls). The other ...
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3 answers
207 views

Best way to stiffen up floor

While gutting my basement I want to strengthen my floor above to make it move less. Currently the floor above moves a lot when people walk around, making it really loud in the basement and causes ...
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Proper way to reframe joists to install attic ladder?

I'm looking to replace the attic ladder with 25.5 x 55 opening ( Century Elite AL2511R5 ). After removing my old ladder, the opening looks like the following : I'm looking to change joists as follows ...
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3 answers
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LVL install with old notched ceiling joists

Down here in Atlanta. Installed an 18' LVL to join two living rooms in my 1960s brick ranch. Used joist hangers on most of the 2"x8" ceiling joists, but there is a small number of joists ...
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1 answer
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How Do I Calculate Joist Size/Spacing for Sea Container Used as Root Cellar?

I am repurposing a sea container (intermodal container) to be used as a root cellar. Sea containers are stacked for transit and the structural integrity for stacking is based on the four castings (...
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Hollow Ceiling Joist? Can joists have side panels?

For scale, the holes in the bar are 2" apart and run end to end, despite not always being visible in the photo. I've been trying to drill three holes in a line across three ceiling joists. But ...
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Can I drill a 6” hole in my i-joist (not load bearing)?

Hi I am in the process of installing a range hood in my basement and I need to snake the 6” vent through a I-joist to get it to a place where I can drill it out through the rim joist. The question I ...
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2 votes
3 answers
141 views

Which fixings will hold a boxing bag from garage joist

I fitted a 5ft punch bag to a joist in my garage. I used the rawl plugs and screw provided. I drilled 6cm deep by 1cm diameter. Bashed the plugs in and tightened the fixing. The bag stayed up for 15 ...
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-1 votes
1 answer
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Fastening Double Ledgerboards for Loft

I’ve got an unfortunate issue, my garage length is 1.5 inches past the free span length for joists. First, is it acceptable to fasten Double Ledger boards to make the distance work? Before designing ...
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Is it necessary to use roofing felt paper between shed floor joists and subfloor

I am building a 12x14 shed with pressure treated 2x6 on pressure treated 4x4 (resting on 4 inches of 57 stone). Before I put the pressure treated 3/4 plywood subfloor on should I also lay down felt ...
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1 vote
1 answer
60 views

How to shim shed floor joists resting on sleepers

I have a 12 x 14 shed with 16 inch on center floor joists resting on sleepers on the two ends and in the center to support the down. However some of the 2x6 floor joists on the end are shy of being ...
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2 answers
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Metal Ceiling Joist Load capability [closed]

What do I need to consider if I want to suspend a 1/2 ton chain hoist from this type of ceiling Joist? I would never even come near 1/2 ton, maybe 50Kg tops. I want to connect an I beam with a trolly ...
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How to fill a second-floor conversation pit?

House was built in 1961 and has a "conversation pit" on the second floor. It may have been added when the house was last sold in 1976, see photos. I'd keep it, except whoever installed it ...
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2x4 floor joists in attic: make stronger/level?

My house is 100 years old in Ontario, Canada. My attic is unfinished, and the joists are true to size (2” x 4”) rough sawn 2x4s (two 10’ pieces make up the 20’ span), 16” OC, cathedral roof. Supported ...
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1 vote
1 answer
63 views

Structural bolt vs screw question on shed plans [closed]

I'm building a firewood shed from these Popular Mechanics plans https://www.popularmechanics.com/home/how-to-plans/a33943439/how-to-build-a-firewood-shack/. It says to join the short direction joists (...
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1/2” Vertical Hole in Floor Joist - What to do?

First post here, hoping to get some help. I was recently trying to run a coax cable from my crawl space into my home office (there was an existing coax drop, but the cable seems to terminate somewhere ...
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2 answers
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How much can I plane/cut off of a deck joist / rim joist

I'm renovating a deck. Installing waterproof spline which goes between deck boards. Solution will have center boards in deck with gutters underneath and gutters around the deck. Install guide says to ...
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6 votes
3 answers
932 views

How should I repair this floor joist that is too short?

My son recently bought a 100 year old house. We have been working on some framing repairs in the basement, and have some questions about the best way to sister some joists. This is a balloon framed ...
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How to replace the heavily notched 4x4 support posts on my deck?

Does anyone have a code compliant idea to replace the support posts I have on my deck? The deck is basically supported by a heavily notched 4x4 that only supports a single 2x6 board that's part of the ...
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3 votes
4 answers
988 views

How to add ceiling joists to 20 foot wide garage?

I am planning to insulate my unfinished garage, which leads to adding a ceiling. There are 4 2x6 joists spacing around 50”. How do I add more joists to support drywall and fiberglass rolls? Location ...
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Can I build tool storage cabinets off of bottom of deck joists?

I have room, and would like to make, some storage for tools in an area under my deck using 3/4 in plywood. I could cement in 4x4 or something in the ground and build off of that but behind a ...
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1 vote
0 answers
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Joist / Jack Hanger for Custom Angles on an Octagon

I am building a deck in the shape of a donut octagon and have some joists meet at odd angles (67.5 deg / 112.5 deg). I have found adjustable joist hangers (ex Simpson Strong Tie LSSJ ) but they only ...
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2 votes
2 answers
113 views

removing room dividing wall?

I have a colonial which I would like to extend the kitchen into what is now a living room, the wall does run perpendicular which usually would indicate that this is load bearing, but also the joists ...
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0 votes
1 answer
121 views

Sistering a joist with no space on any side

I am doing some work to the area underneath my master bath. While opening up the walls we found some large holes drilled into the joists for the plumbing running through it. In one case I have two ...
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3 votes
1 answer
716 views

What are the actual dimensions of a 4x8' subfloor plywood panel

If the joists are 16"oc and our plywood is exactly 4x8' and we have to allow 1/8" gap between our plywood panels wouldn't it shift the next panel by 1/8" and then the next by 2/8" ...
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7 votes
4 answers
2k views

Thoughts on building a brace for a heavy chandelier?

I need to build a brace to support this light fixture in my dining room. The eyelet screws on either end should be attached to the existing ceiling joists. However, mine run opposite the direction ...
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0 votes
1 answer
110 views

Can I screw through wood floor and plank subfloor to joists to prepare surface for tile?

I’m renovating my 100year old house’s kitchen and found that the old existing tile was attached directly to hardwood flooring. This explained why so much of it was cracked even though it is the only ...
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3 votes
4 answers
805 views

Suggestion on deck frame joinery

I am planning to build a deck to my backyard, and I'm using a soft wood - I guess it's spruce not sure / not a very high quality wood. I am having hard time to decide on choosing the construction ...
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0 answers
44 views

Remove joists from above the kitchen

I have installed skylights and would like to cut through the ceiling. I have taken some pics from the attic. Would I be able to cut the joists above my kitchen and have the vaulted ceiling show up? ...
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1 vote
1 answer
160 views

Is it safe to remove this plywood ceiling and ceiling joists?

I'm looking to remove the plywood ceiling in this porch along with the ceiling joists that I believe are only serving to hold the ceiling in place. I'm wondering if I'm missing anything. The roof is ...
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0 votes
1 answer
122 views

Porch Swing Support

I have a 12' deep by 46' wide porch off the front of my house. The porch rafters are 2x6 8" OC with 2x4 laid flat on the bottom sides of every other joist. My wife would like to hang a porch ...
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11 votes
6 answers
7k views

I want to build an all metal, self-designed building. Are metal frame and joists really that infeasible?

I have been putting together plans for my dream house. First an architect friend of mine said she might help, but right now she's got too much business and she hasn't even had time to look at a ...
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