Questions tagged [joists]

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

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1answer
17 views

Connecting two joists with a wooden piece to hang a projector screen

I have a projector screen (45lbs) that I have to hang on the ceiling on it's two ends. However the joists on the two ends are not correctly positioned so I can't hang the projector screen where I want ...
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2answers
69 views

Is my detached garage ceiling capable of handling the load of drywall and insulation?

I'm looking to drywall and insulate my detached 3 car garage that measures 40' x 25'. The ceiling joists are 4' OC and I've realized thay may be a problem. The previous owner contracted a garage ...
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46 views

Wires through conduit instead of drilling ceiling joists

I am moving the washer & dryer upstairs in my house and will have a contractor hook-up the 10-3 and 12-2 wires to my main panel, but I am running the wires across my attic. Instead of drilling 23 ...
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2answers
71 views

Notched TJI Joist

Doing a bath remodel and upon tearing out the drop in tub, I came across a notched TJI joist. (and then some at 4 1/2") There is another joist 5" away so it makes me wonder if the notch is ...
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1answer
30 views

Deck, Connecting two beams to support cantilevered joists

I am re-posting this because my original post had poor drawing and caused a lot of confusion. See image below. I have a joist that is cantilevered 4' 10" (colored in cyan for quick reference), ...
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2answers
59 views

Raised shed floor

Did I make a error? Should my joists be pressure treated?
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1answer
60 views

replacing flooring with no subfloor - walls sit on top of finish floor

I need to replace the hardwood floors on the second floor of an old home. A challenge is that the existing floors are nailed directly to the floor joists, with the walls resting on top of the finish ...
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1answer
46 views

How should I hang joists that are supposed to be doubled, but that will sit over the joining of two boards?

I need to hang a 22' ledger board, but I can only get treated boards up to 20' in length. The deck plan calls for a doubled joist at the 18' mark, which is where the edge of the main body of the deck ...
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28 views

Installing Ladder in Historic Brick Garage

Just bought an old home with a detached 1905 brick garage w/ loft. Currently, the only way to access the space is by pulling out a ladder and climbing through a 16" opening at the end. I'd like ...
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1answer
177 views

How to reinforce a floor joist with a split knot?

An electrician ran some new wires and had to bore through the floor joists. In doing so, one came very close to a knot in the wood. The floor above squeaks now as a result, where it didn't before. ...
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1answer
65 views

How to fix a joist that has been cut out

I’m doing renovations in an old kitchen. I removed the ceiling as it was damaged, old and nasty. I found that when some prior owner renovated the bath above, they cut into the joists to add plumbing. ...
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2answers
71 views

When installing two layers of subfloor, is it okay to secure both layers to joists?

I am in the middle of replacing my subfloor. The old subfloor was two layers, each about 1/2 inch thick, totaling 1 inch. 1-1/8 inch OSB is pretty much out of stock everywhere at the moment so I'm ...
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6answers
4k views

How to reinforce a joist with plumbing running through it?

After removing the sub floor in my bathroom in order to extend the sewer pipe for the toilet (it's too close to the tank-side wall), I found that the floor joists have extremely large holes cut in ...
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2answers
48 views

I-joists on an old dimensional lumber floor

I’m remodeling a room on my first floor and will need to move a HVAC duct, make it run across 4 joists of the second floor. Room is gutted, and I can see second floor has a 3/4" OSB subfloor on ...
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3answers
99 views

Want to install Japanese style unit bath/bathtub. Trimming a joist a bad idea?

I am asking myself if there is any way possible to lower the bathroom floor level without causing damage to the floor. So I am researching if it is any way possible to install a Japanese unit bath ...
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1answer
71 views

Getting plumbing on the other side of support beams

Had some 2nd-story plumbing start to fail in my 1950's home, so I had the brilliant idea to re-do a "mud-job" bathroom. It included removing a non-load bearing wall from the adjacent ...
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1answer
92 views

How to treat joist that has wet rot before sistering a new joist to it

I'm currently in the beginning stage of a bathroom remodel. All the flooring and subfloor has been removed, and I'm at the point where I am getting ready to replace some joists and sister one. The ...
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1answer
52 views

Plane floor joists, sand subfloor, or sand underlayment to handle hump in floor for cork plank flooring?

I am planning to install 5/8 in. plywood underlayment for some floating 1/4 in. cork plank flooring. Unfortunately, there is a hump in the floor spanning three joists, based on my measurement and ...
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1answer
77 views

How are joists secured to sill?

From what I’ve read on residential construction, the process of building the first floor goes like this: Foundation of some kind is set Sill plates are bolted to the foundation Floor joists are set ...
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41 views

Venting Dryer to Outside Through Foundation Wall OR Vent?

I'm relocating and replacing the ducting to vent my electric dryer that is located in the middle of my home. I'm using 4" galvanized duct, I've installed a Dryer Box on the back (2x6) wall of my ...
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1answer
53 views

Moving a toilet [closed]

How difficult/expensive would it be to move a toilet across joists? My bathroom is over a garage so I can get to it from below.
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1answer
34 views

Tips for avoiding floor impact noise

We had a 2-story extension built, complies with earthquake code in Oregon. It only has a sub-floor right now but the impact noise from the bedroom to the kitchen downstairs is shocking. The final ...
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1answer
99 views

Do I need to sister this ceiling jost?

A plumber came to push my DWV pipe back so I could decreased my soffit/bulkhead. In the process, he cut a bit into one of my 2x8 ceiling joists. Not ideal. Wondering if I need to sister the whole ...
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1answer
81 views

Can I bore a 4inch hole through my ceiling joists?

I need to install a bathroom ceiling fan for a new bathroom I'm adding to my house. The only issue is that the floor joists are running perpendicular to where I need to run the 4'' aluminum duct pipe. ...
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32 views

Filling first concrete floor with Autoclaved aerated concrete (AAC) brick to 3 feet height is good?

First concrete floor is with 500 sq.ft. area. Out of this, 200 sq.ft. is in projected form for about 3 feet height. So, we are planning to fill in with AAC blocks up to 3 feet height for the rest of ...
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2answers
1k views

What is this orange yellow substance on my wooden studs inside walls?

There's some kind of orange yellowish looking substance that forms into tiny bubbles (it looks sticky, but I haven't touched it). It seems to be on my floor joists and wall studs. The house is from ...
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2answers
88 views

Can I run cable across the gap between floor joists?

I've been working on wiring my shop in my unfinished basement (sub-panel installed by a licensed electrician) and I've come across a question I haven't been able to find an easy answer to. There are ...
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1answer
43 views

Is using a single hanger plus a framing angle on a double member sufficient

I recently had a deck built. The deck has a few places where double joists are used between beams to allow cutouts for trees. The framers used single joist hangers for the 2x6 16" oc joists. On ...
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2answers
207 views

How might I attach pieces of lumber between two garage ceiling joists for the larger goal of mounting a punching bag to the lumber?

I'm extremely new to home improvement and am seeking some input from people far more experienced than myself on the following project. In short, I want to install a punching bag in my garage. The bag (...
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1answer
38 views

References to calculate lumber size and span for flat roof?

I want to design a flat roof extension to create a screen patio. I would like to find a reference for maximum span and sizing with standard (such as SY pine) lumber for beams and joists. I'm not going ...
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3answers
2k views

Are my trusses capable of carrying the load of insulation and drywall?

We are insulating our garage and need to build a ceiling to separate the attic and the main garage area. The span of the bottom chord of our trusses is 22 feet. Will our truss system support the ...
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4answers
2k views

Can I overlay lumber perpendicular to floor joists to raise the floor height?

We have put our 2x6s joists down in our bathroom that is 2.45m by 1.45m. We realized that we are short by about 8cm, so we were thinking, is it a bad idea to put 2 by 6s flat I.e the 6 going ...
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37 views

Wet timber from timber shop for joists?

so we’ve bought our 2 by 6s C24s treated.Tbh anywhere we went the timber was outside, I think it had been a wet the past few days. is it still ok to drill our timber into the brick wall to be our ...
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0answers
83 views

What's a low depth floor joist solution for 2nd floor with 4x4 floor joists?

My goal is to meet the code requirement for the strength of the floors on a 2nd story for a remodel. I am remodeling a house where the floor joists supporting the 2nd floor are nominal 4x4 (3.5" ...
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1answer
207 views

What is the max span that can be supported by 2x4 floor joists?

We had old 2x4 floor joists sitting in our bathroom that we ripped out as they were rotten and falling apart. 2x4 is ideally our limit of thickness, and I was thinking of having 4 or 5 2x4 joists ...
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1answer
138 views

Is this legal? And should we use 2 by 8s?

I posted a couple of days ago about joists not reaching the end of the wall, and it was only a subsection. We’ve stripped off all floorboards and this is what we see. Now the question is, these ...
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3answers
273 views

How to check if joists are on plane?

I'm considering using 1x3 strapping before applying my new drywall ceiling (after doing some more work on them the other night and realizing it may be the best option). The ceiling joists are exposed ...
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1answer
72 views

Joist not reaching the end

We are redoing a wet room on the ground floor and we have uncovered the floor boards. I'm looking at this and I'm totally baffled.... the joist doesn't even reach the end of the room... what's ...
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1answer
117 views

Unsupported joists in attic?

In my attic there is a beam that ends 80% of the way through. A few of the joists are connected with nails but are unsupported laterally. Should these joists have better support?
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0answers
98 views

Can I flip any hanging beams flat on their side?

The framing in my attic is annoying because it's very difficult work near the roof edge, due to the presence of what I think are called hanging beams -- large timbers on edge attached to the tops of ...
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2answers
457 views

What is the best approach to repair outside cantilevered wood deck joists with dry rot?

I have a cantilevered deck that was needing new decking boards. As it turns out it also has some dry rot on the joists that are cantilevered from the house (14ft high, extending 6ft from the house - a ...
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2answers
90 views

Could joist bridging prevent movement and noise in my tile floor?

Brand new tiles installed by contractor 4 years ago in kitchen, bathroom and also in a new house extension on pillars. Tiles started clicking in the extension during first winter. Now the grout is ...
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1answer
86 views

Running NM and BX Cables – Stackable Staples – Rim Joists - NEC2017/2020

I mocked up some cable runs and was hoping someone could confirm that they don’t break any NEC2017/2020 rules. The wires are run along the rim joists on the upper edge of the wall right under the ...
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1answer
35 views

Best and easiest way to seal insulation above concrete pour in unfinished areas of basements? [closed]

One of the things my crew is doing is trying to quickly make unfinished areas in basements look nicer and easier to clean. We usually stuff all outer joist walls with roxul to insulate and while this ...
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1answer
376 views

Drain pipe through floor joist

I'm moving my sink. And I have to run my drain pipe through my floor joist or cabinets. My floor joist are 2×8's. Can I run a 2 inch pipe through them. And if i did run them through my joist would it ...
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1answer
189 views

Short joist not continuing through kitchen soffit foiling remodel plans

My house is a 1960s build and has no gables, every exterior wall has a roof slope to it. In the kitchen, most rafters are North-South, with the East end being angled down until it meets the garage. ...
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1answer
114 views

Joist size calculation for attic loft conversion

I'm familiar with the concept of sistering ceiling joists to make them appropriate to hold a live load as a floor, but I've found the various joist calculators and tables either wrong or confusing. I'...
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1answer
135 views

Did I severely compromise my foundation by drilling diagonally through a floor joist?

I’m boring some holes to run new wiring and there happened to be two adjacent floor joists under where I was drilling, so I drilled diagonally-vertically through one of the joists. The hole is 3/4” ...
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1answer
285 views

What is the purpose of these roof joists/braces in old house can they be removed

I am working with builder to replace the ceiling in the loft of my 200 year old house. The old ceiling has been taken down and we are going to put joists between rafters for the new ceiling, attaching ...
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1answer
304 views

How to sister joists to level a floor when they've already been sistered to level the ceiling below?

We are remodeling a second-floor bathroom. The floor dips, and my plan was to sister the joists to level the floor. This is an old house, built in 1920. The previous owner redid the kitchen. The ...

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