Questions tagged [joists]

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

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Can I add decking without a frame? [closed]

I have a span of 3+m and I want to create a decking. People suggest 2x8 can span 2m? I'm assuming they mean as vertical joists? What thickness of lumber to actually be load bearing across 2m laid flat?...
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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
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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
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3 answers
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How do you level and fasten joists over uneven concrete for a deck?

I'd really appreciate advice on a 'ground level' deck I'm going to build off the back of my house. There is an existing concrete slab (pink in images) in good condition - recently poured before I ...
Brad Marshall's user avatar
1 vote
2 answers
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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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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
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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
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1 answer
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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
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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
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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
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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
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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
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1 answer
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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
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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
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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
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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
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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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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
310 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
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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
64 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
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1 vote
2 answers
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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
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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
119 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
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1 answer
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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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0 votes
1 answer
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How do I repair this joist? [duplicate]

Previous homeowner cut a big notch into a joist in the basement to vent a gas water heater. I had the water heater replaced with electric, and now I want to fix the joist. (Photo below, with annotated ...
Andrew's user avatar
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1 vote
1 answer
207 views

How should I address lengthwise cracks and other issues in old floor joists?

I purchased a house from 1900 about a year ago. One of the biggest problems I have unsurfaced is cut and cracked joists. My questions are as such with pictures below: Can I just jack them up, ...
Eric D's user avatar
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2 votes
1 answer
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How to insulate Rim Joist with no sill plate?

I recently had an energy audit/blower door test on my 1963 single-story ranch home in SE Michigan. They noted a lot of air infiltration along the baseboards, and recommended pro sprayfoaming the rim ...
sonoflee's user avatar
1 vote
2 answers
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Repair edge of joist from water damage

Long long ago, water damage was found when painting, and work was stopped so another crew could come in and replace a beam that the ceiling joists were nailed into. This required jacking up a temp ...
sroussey's user avatar
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Making a secret passage to my attic. Can I cut the ceiling joists?

I am putting a secret passage in my linen closet behind a grandfather clock (a la the Webster show) to access my attic. My question is: Can I cut the ceiling joists to make the opening bigger? Here ...
Lala's user avatar
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8 votes
1 answer
1k views

Joist are not properly attached to the band joist - found by home inspector. What does the repair entail?

Just got an inspection on 123 year old house. Home inspector noted: Moderate settlement. Further evaluation and preventative maintenance recommended. Joist are not properly attached to the band joist. ...
Toni K.'s user avatar
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2 answers
506 views

Do you leave gap between the framing wall and ceiling joist?

I saw a YouTube video advocating that an interior, non-bearing wall is well constructed with a 3/4" gap between its top plate and the ceiling joists above it. Is this legit or not? I've been ...
vandy's user avatar
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4 votes
1 answer
272 views

How Do I Frame an Opening in My Bathroom Floor

I am fixing termite eaten and improperly spaced joists in my home. I need to create space for the bathtub drain fixtures, which are currently riding right up on a joist that runs under the bathtub, ...
Zen00's user avatar
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1 vote
1 answer
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Mounting dance pole to 55mm joist [closed]

I'm setting my up partners dance pole under our house. I was either going to bolt 2 cuts of 90x35mm timber to either side of the existing joist (which is around 90x55). Then bolt the pole anchor to ...
Andrew Bowerman's user avatar
6 votes
2 answers
1k views

How do I screw through a metal bathroom fan box to affix it to the joist?

I am in the process of replacing an old bathroom fan in a guest bathroom with a new Nutone ARN110LKVV. After running some new electrical and getting the old fan out, I finally got to the step where I ...
ZbadhabitZ's user avatar
1 vote
3 answers
85 views

Attic access, feasibility-how-to question

We are trying to build an attic access to our second story. The plan was by to support and cut the middle joist (pic), and box it out. The hole in the drywall is into a closet. We were going to remove ...
Kyle's user avatar
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0 votes
1 answer
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Sistering to lapped rafters

Looking to strengthen some rafters in a nearly century-old house & have a situation where the only spots available for sistering only allow for about 1” toehold due to lapped rafters from the ...
wmsts's user avatar
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-1 votes
1 answer
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Shall I/How to Repair Falling Subfloor? [closed]

I happened to find the one piece subfloor under my dishwasher is falling. Shall I repair it? If yes, how to do that? The most professional way I suppose is to remove the cabinet and floor in the ...
bobby_yan's user avatar
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0 votes
0 answers
111 views

Can foam jacking restore slope to my front stoop?

The stoop in the front door inclines towards the house and guides the water into the crawlspace. The stoop itself is outside the foundation wall of the house and is not fixed to it. The lower part of ...
bobby_yan's user avatar
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1 vote
2 answers
194 views

What are some effective ways to repair water-damaged rafters in a garden shed?

After addressing a previous leak in my garden shed, which was previously used as a home gym, I discovered some water damage when I removed the compromised OSB board from the shed’s ceiling. I’m ...
LondonGuy's user avatar
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2 votes
2 answers
505 views

Can I run electrical wires along this metal support beam?

I have a metal I-beam in my basement that supports my floor joists. I am running new electric, and I want to use it as a sort of running board - I know I can't string certain gauges perpendicular to ...
user112697's user avatar
0 votes
2 answers
60 views

Basement Ceiling Soundproofing [closed]

How can I soundproof my basement ceiling? I was thinking of enclosing the entire basement ceiling with 2x4s to soundproof the floor, will this work?
user172904's user avatar
0 votes
2 answers
94 views

Floor sinks 7 inches to the center over 25 feet

I found out the floors in my condo sink 7 inches to the center over a 25 foot space. I am wondering if maybe the floor joists are beyond repair ? They want to put a pilar and beam under this to “stop” ...
Jimmy's user avatar
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1 vote
1 answer
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How important is horizontal spacing for small (~1") holes in 3x9 floor joist?

I have old 3x9 ceiling/floor joists (actual dimensions), 48 inches on center. I needed to run additional wiring so I made a new 1" hole above and slightly offset from an existing hole with 2+ ...
touko's user avatar
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1 vote
1 answer
147 views

Prep ceiling for drywall when electrical wiring is under floor joists

I'm planning a refresh on a ~400sqft space in my split level home. Its a walkout basement that currently has shiplap walls and a dated drop ceiling. Ideally I'd like to drywall both the wall and the ...
TheDandyLion's user avatar
0 votes
1 answer
369 views

What lumber should I use when replacing floor joists?

I am replacing about ten floor joists that are almost completely rotted through, one’s even been cut in half for a four inch drain. The joist size is exactly 2x7.5" with about a 16 foot span. My ...
Jake's user avatar
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0 votes
1 answer
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Where to cut the opening for bath vent in crawlspace wall?

My first-floor half bath vents into the crawlspace, which violates the code, and I would like to correct it. A feasible way is to extend the hose from the current vent in the crawlspace to the nearest ...
bobby_yan's user avatar
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1 vote
0 answers
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Proper Joist Installation to fix Subfloor Overhang

I am currently doing a full bathroom remodel on a house I just bought. The entire floor was rotted, so I had to remove it all the way down to the joists. I am planning on sistering two of the joists ...
Jackson's user avatar
  • 11
2 votes
1 answer
549 views

Proper way to reinforce floor joist

We moved recently. Most of the floor joists have been reinforced as shown in the pictures below. There are a few that were not reinforced by the previous owner which I would like to reinforce. This ...
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