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Questions tagged [joists]

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

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Space between deck beam & joist and deck wobbles side to side

My deck wobbles from side to side. So I started looking underneath the deck to check what the issue was and how to mitigate it.  I noticed that the joists are attached to the beam using nails instead ...
sambosma's user avatar
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Do I need to repair a rotten joist?

While replacing the floor in our small toilet, I discovered that a joist (which is actually under the shower in the adjacent bathroom) has rotted away. The previous owners of the house had badly ...
Rocketmagnet's user avatar
2 votes
1 answer
76 views

How far can double 2x8s span as girders/beams for a shed?

I'm getting ready to put up a 10x8 plastic (resin) shed, and I'm planning to use 12-inch concrete piers as the foundation. I'd like to just do 4 piers, one at each corner, with double 2x8s spanning ...
Mike Willis's user avatar
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1 answer
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How do you properly secure joists/rim joists atop sill/top plates?

Is there a specific Simpson bracket to attach a rim joist to a sill/top plate or do you simply toe nail it every X" into place? I have to use joist hangers to attach joists to said rim joist but ...
Larry Lupe's user avatar
1 vote
2 answers
93 views

Ideas for Supporting this Joist

I have an unfinished basement and noticed this joist not supported like all the others. Need some ideas how to fix this. See photo. This is the "Good" truss This is the stubby truss. ...
Rick S's user avatar
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6 votes
2 answers
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Can this 1930s box support a ceiling fan?

I live in a house that was built in 1932. I assume the ceiling fixture boxes are original to the house. It looks like the box is secured to the joist, and it has a brace running between two joists. ...
Kyle R's user avatar
  • 161
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1 answer
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Bookshelves and floor loading - is this safe?

I'm thinking about making / having made some bookshelves to replace some flat-pack trash "book" shelves that can't really hold books. A lot of my books are on the larger and heavier side. ...
Matthew's user avatar
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2 answers
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Rotted Rim Joist/Sill Plate Behind Concrete Patio

hoping for some guidance on a rotted rim joist/sill plate found in the crawlspace. The rim joist in question runs along the front of the house and is parallel to the other joists. I believe the front ...
gocteam8's user avatar
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Replacing a small rotted deck, question about framing/step

So the small deck (or patio? it barely feels worth calling a deck at this point) on the front door of my house was rotted and sagging, so I pulled it out. After going over the DCA6 guide, I realized ...
user3397540's user avatar
6 votes
1 answer
549 views

Rafters pulling apart from center support

Some of the rafters are coming apart in my attic. What is the best way for me to resolve this issue? Please note that a new roof was just put on over the problem. The roofer assured me that he would ...
RogueJax's user avatar
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1 answer
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Adding joists to second floor above garage [closed]

My bonus room was made above the garage. The garage ceiling is drywalled, by not really finished. Would it be recommended to add more joists before putting a squat rack in the bonus room? Generally ...
louissanchez84's user avatar
2 votes
1 answer
2k views

Running basement wiring in floor joists

Running wire across basement to electrical panel. Drilling and running perpendicular to joists, need to do a right angle turn and run parallel. Does the wire have to go through a joist before the turn,...
DIYer's user avatar
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Finding Joists Under Triple Layer Sheetrock

I recently purchased a new home and am trying to add some hanging storage to the garage but I'm struggling to locate the joists for my anchors. After trying multiple techniques to find them (knocking, ...
Ben D's user avatar
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1 vote
2 answers
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Floor Joist with Long Crack [duplicate]

I have a floor joist that has a crack down the center of the board (about 8 feet). I recently noticed it after hearing my floor start to creak above it. There doesn’t appear to be any floor sagging ...
Mike Pak's user avatar
1 vote
1 answer
93 views

How to create a sloped floor for drainage on existing flat level floor joists?

I'm building a traditional outdoor wood-fired sauna cabin. The traditional Finnish ways to build drainage is either gaps in the wood floor to allow direct drainage to the ground, or sloped floors into ...
pkamb's user avatar
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Freestanding Patio Cover Beam Size

Trying to build something like this but with a 16ft span: https://www.backyarddiscovery.com/collections/slope-roof-gazebos/products/12-x-9-5-arcadia-gazebo I'd like to build a slope roof patio cover ...
user1594257's user avatar
-1 votes
1 answer
38 views

hanging a chin-up bar from floor joists in basement [closed]

My question is similar to a question above about chin up bar. The broad question simply is it safe from the standpoint of structural integrity to put nails or screws directly into floor joists, ...
Keith Herzog's user avatar
4 votes
1 answer
1k views

How can I support a subfloor patch between joists?

I'd opened up the subfloor in my second-floor bathroom to relocate the plumbing from the floor to the wall. Before I patched the plywood subfloor, I found out that these flat 2x4 joists are ...
bsong's user avatar
  • 67
6 votes
2 answers
2k views

How can I support a sagging double joist where the hanger was cut?

I noticed that my bathroom floor was sagging and discovered a floor joist underneath the bathroom has a considerable sag to it. From the looks of it, the floor joist was previously sistered and used a ...
Niko's user avatar
  • 387
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0 answers
24 views

How to fix a bump over central main beam and level floor?

I reside in a 1950s-era bungalow. In its basement lies a wood beam, connecting and upholding the joists (2x10) through a 2x4 ledger that's been nailed in place. The structural walls on the main floor ...
Laurent Nadeau's user avatar
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Ceiling joists/false ceiling

I am trying to determine how my ceiling is constructed. I live on the top floor of a building built in the late 1800s/early 1900s. Specifically, I want to know if my drywall ceiling is mounted ...
Cindy's user avatar
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0 votes
1 answer
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Can I put a 2x10 ceiling joist Douglas Fir#1 at 21-6 span at 24 on center?

In my garage I have a span of 21 feet and 6 inches with 2x8 rafters. Can I put a 2x10 ceiling joists on 24OC for an ADU? They will be sitting in the top plate of the walls. I am in California, and ...
Gearz's user avatar
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0 votes
1 answer
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Putting in a sub ceiling in garage to insulate and dampen sound to upstairs bedroom

I am putting in a sub ceiling with insulation and drywall. I have begun the project and it kind of suddenly hit me that this weight could be dangerous? I'm running the 2x6x9.5 ft joists from these ...
Ceiling guy's user avatar
0 votes
1 answer
52 views

Where to run 4" exhaust fan duct?

I'm installing an exhaust fan in my bathroom. I plan to install it somewhere left of the octagon box that you see in the picture, However, there's a 5 3/4" joist right there. I'm not sure if I ...
Scrap Money's user avatar
12 votes
3 answers
3k views

Can I hang a swing from manufactured "I" joists made of wood?

This is a picture of my ceiling. I would like to hang a swing that will hold an adult. I'm not constricted for space, so I could attach directly to one of the 2x2's
Caitlin's user avatar
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0 votes
1 answer
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How to connect Vapor barrier to joists basement

I’m trying to figure out best way to connect Vapor barrier to the joists in a basement renovation. House is in Alberta Canada. 1970 build. The basement wall consists of a concrete wall with a pony ...
Paul's user avatar
  • 3
0 votes
1 answer
160 views

Floor joist was cut and repair was secured with drywall screws. How to properly repair?

While remodeling my bathroom and checking the floors for level, I noticed one corner of the bathroom had a 1/2" dip. I went to inspect the joists from underneath in the basement and found that a ...
Niko's user avatar
  • 387
2 votes
3 answers
313 views

How do you level and fasten joists over uneven concrete for a deck?

Update/solution for future reference: I used a laser level set 20in. above desired top the joists and then laid a joist on its side next to where it would ultimately be positioned and then used a ...
Texaus_76's user avatar
2 votes
2 answers
174 views

How to fix twisted floor joists and install blocking

I'm trying to get things ready in my unfinished basement to frame walls and finish it. Currently, I'm trying to add solid blocking between my floor joists and sister a few joists before I start ...
Mike's user avatar
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Floor Joist Penetration Repairs [duplicate]

Any suggestions on how to repair this? All 4 penetrations are too big, but this top left one is particularly bad. I’ve looked at the engineered steel plates they sell online but those require 1.5” of ...
Rob's user avatar
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0 votes
1 answer
166 views

Is this mold on my floor joists? [duplicate]

I recently bought an older house (~2000) and I noticed that pretty much all the joists in the basement ceiling have this discoloration. I was wondering if any of you have experienced this/can confirm ...
newhomepain's user avatar
0 votes
0 answers
96 views

Wall parallel to cieling/floor joists- is it load bearing?

I have a wall on the first floor I'd like to remove that runs parallel to my cieling/floor joists. This is my first demolition project in the house and I'd love some insight prior to contacting a ...
Acejpg 's user avatar
1 vote
1 answer
122 views

How to seal/insulate partially embedded rim joists?

First time home owner, please go easy on me haha. I purchased my home March 2023. It's a 1947 bi-level located in Minneapolis, MN. I was looking into options to air seal or insulate my rim joists. ...
Peter Bibelhausen's user avatar
2 votes
1 answer
61 views

Is it safe to put thin insulation board on the bottom of joists in crawlspace?

My townhouse has a partial lower level and partial crawlspace of dirt. Rooms with crawlspace under get pretty cold in winter. There is some un-faced (I think) fiberglass roll insulation tucked up ...
Hairy Beast's user avatar
2 votes
1 answer
363 views

Hanging Chair from Ceiling in Apartment?

I bought a macrame hammock swing chair and a steel plate ceiling mount that came with 4 big expansion screws (pic #1 is chair i bought, pic#2 is mount with included expansion screws. Mount is size ...
JuhSuhCah's user avatar
0 votes
1 answer
123 views

How do I determine why my town house floors are uneven all over? [closed]

My townhome, built 1988, has floors that are not level throughout the home. In the bedroom if a dresser is against the wall on two opposite walls they have an extreme forward tilt; but, on the other ...
Bri's user avatar
  • 1
0 votes
1 answer
62 views

Adding support for subfloor

Im replacing the subfloor in a 2nd floor bathroom of a 1920s house. It was level and in decent shape, but covered with adhesive and backer board for tile so replacing it seemed the easier option. ...
BakerAugust's user avatar
0 votes
1 answer
233 views

Reinforcing 2x8 floor joist

My home was built in the late 50's with 2x8 floor joists. When my 130 lbs dog runs across the room, the floor bounces slightly. We are wanting to reinforce that area before adding a heavier dining ...
Joseph A Sparks's user avatar
2 votes
1 answer
282 views

How to add "partial" ceiling joist to support mini split cassette that needs 16" OC joist

Our ceiling has 24" OC joists, and we are adding a mini split ceiling cassette that needs 16" OC joists. Can I add a "partial" ceiling joist to support the mini split? That is ...
r_alanb's user avatar
  • 215
1 vote
2 answers
349 views

How can I drywall basement ceiling with gas and water pipelines below the joists?

I need to drywall my basement ceiling. There are gas and water pipelines below the joists as shown in the picture. How to install drywall just below the pipes? Please help with a solution for drywall. ...
Shivakiran Neelagiri's user avatar
6 votes
1 answer
2k views

Any idea what this structure in my attic might be?

I have no idea what this structure in my attic is or what's inside it. It's about 10' x 15' and sits above my dining room. It's made of plywood and drywall and extends to the edge of the roof. There ...
mr_moany_wiggles's user avatar
0 votes
1 answer
85 views

Is my beam sized properly?

I’m trying to determine if my beam is strong enough. Double 2x10 pine 6.5ft long center beam holding up upstairs floor with 16”oc 2x10 floor joists one side are 12.75ft long and 11ft long joists on ...
Joe Zacha's user avatar
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0 answers
40 views

Help confirming this TJI joist can span an opening

I have an interior wall that I'm going to be cutting an opening in. the top plate is a TJI joist. I'm 95% certain it's 20in, but it is definitely at least an 18in (see pic). Underneath the joist is a ...
The Shoe Shiner's user avatar
2 votes
1 answer
313 views

Can I use subfloor to align a house-length starter row of hardwood flooring to the house, rather than to a single room?

Carpet has been removed and subfloor exposed and cleaned. The floor has been leveled to <3/16" out of flat over 6', primed to cover some pee spots, and is ready for the underlayment. The new ...
J.D. Mallen's user avatar
0 votes
0 answers
59 views

Replacing floor joists?

The house was built in 1976. It has a crawlspace foundation. There are two joining spans with 13 feet in front, 13 feet in back. A central beam between them. The front half of the house has water ...
Please Help's user avatar
1 vote
1 answer
70 views

Will my eastern pine floor joists support a heavy marble island top?

Historic true 3 by 10 eastern pine floor joists spanning 20' length, 16" centers. I have a center marble island measuring 5' by 7' weighing 60lbs per sf, approx. 3,000lbs of weight. Trying to ...
Nathan's user avatar
  • 11
1 vote
2 answers
146 views

Shallow joist sit on the sill plate

I noticed several joists sit < 1/2 inch on the sill plate. Is it dangerous? What should I do to enforce them.
movila's user avatar
  • 273
1 vote
2 answers
81 views

Raising TJI Joist

i want to raise tji joists in second floor washroom. 9 1/2" tji joists need to be raised 3 1/4". We want the tub to be 5" higher that the rest of washroom floor. There is no lumber like ...
El Barto's user avatar
2 votes
1 answer
144 views

How do I drill into a crawlspace?

Trying to route some HDMI and ethernet cables through the crawlspace. There was an existing coaxial receptacle which I want to remove, so I removed that and expanded the hole. After everything is done ...
Daniel's user avatar
  • 261
1 vote
1 answer
231 views

How would you handle this sagging notched 2x10 joist? [duplicate]

My 1952 ranch has a saggy spot in the floor. It's centered on a vent that was cut into the top of the 2x10 joist. The cut is about 12" wide, 5" deep. There is about 4.5" of joist ...
NATHAN's user avatar
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