Questions tagged [joists]

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

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2answers
544 views

Drill or notch joist?

Followup to another question where I asked about drilling diagonally up into the sole plate and joist (I think I got good answers but realized but didn't get a clear "it's ok to drill through the ...
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3answers
838 views

Would drilling a small hole through joist / sole plate cause structural problems?

New home owner. I need to wire some ethernet and coax across the basement up into to the first floor wall. The perimeter wall is cinderblock, it is a twin and this is the shared wall. It looks framed. ...
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2k views

Correct way to support a pipe run parallel to floor joists

I would like to install pipe parallel to the floor joists in my basement, and then conceal it behind drywall. I need to do this with both gas (black iron) and domestic water (copper) pipe. I'm ...
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2k views

Reinforce joist near rafter for porch swing

Recently purchased home and saw existing eye lag screw or bolt coming from front porch ceiling. Rolled the dice (hoping for bolt + reinforcement), did not remove vinyl ceiling to inspect carpentry. ...
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3answers
692 views

How to approach insulating my rim joist

I'm working on finishing my 1924 home's basement in Minnesota and am currently working on insulation. My rim-joists look like this: 2x8 Joists with a board between each joist. Behind that board is a ...
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2answers
211 views

Irregular/Atypical Deck Joist Spacing

I'm planning a replacement for my deck and ran into a question that I cannot find an answer to anywhere. Why does everyone place deck joists at either 16" or 24" OC (or sometimes 12"), but not 18" or ...
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1answer
520 views

How should I replace a cantilevered rim joist?

The rim joist on the front of my house has water damage and needs to be replaced. When I pulled off most of the rot, less than half the board's thickness remained. The floor is cantilevered about 3 ...
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2answers
720 views

Why are my joists smaller than standard size?

I was preparing to replace a cantilevered rim joist on my house today. I bought a 2x10 treated board to replace it. I cut a piece to use as blocking and found that the board was much wider than the ...
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1answer
768 views

screws, bolts or nails for ground level deck framing

Following up framing for ground level deck I'm putting 2x8 for framing of the ground-level deck, it is a floating deck, i.e. not attached to the house. So, 2x8 joists will be sitting around perimeter ...
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1answer
1k views

Wall Removal - Not Load Bearing - Keep Ceiling Joists

DIYer here and recently bought a fixer upper. I'd like to remove the wall between the kitchen and the livingroom. I'd like to complete this project soon so I can insulate the attic. My home inspector ...
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0answers
145 views

Sealing fully cast-in floor joists

My house built in 1928 has concrete filled spaces between the floor joists and rim joist. There are gaps in some of them, some 1" wide with most being very small. I suspect these gaps could be the ...
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2answers
147 views

How Do Houses Prevent a Water Buildup in the Flooring?

I have been reading Canadian Wood-Frame House Construction to get an idea how houses are built and function, and am really confused about one aspect. External floors are built just like external ...
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1answer
474 views

How do I mount a TV bracket to a plasterboard/drywall ceiling?

I'm really just looking to confirm what I assume is the best way to do this. I don't know what the total weight will be but the bracket is rated for 30kg (66lbs), so let's assume the TV is the ...
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2answers
326 views

Trying to Determine if Attic Braces and Collar Ties are Structural

I have a 1924 house. The attic has 2x4 ceiling joists with 1x4 collar ties about 80" above the joists. The slope of the roof is 20/12. Below the collar ties there are two crossing 1x4 braces that ...
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2answers
492 views

Recessed beam where joists meet in center of room

First. I am getting a contractor. I like to have a good idea what I am dealing with so I can understand what 1,2,3 contractors with estimates propose to me. Ranch house with Cape Cod roof sitting on ...
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0answers
83 views

How to drill hole in joist for ethernet [duplicate]

i have a bit of an issue. I live in a 2 story house and I'd like to run 2 ethernet cables down to the first floor from my room. The issue is that when I drilled the hole, i drilled it diagonally ...
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3answers
1k views

Running wire to ceiling with double joist parallel to wall

I'm finishing my basement, done the framing and starting wiring for lights. One wall runs parallel to the joists, and has a double joist (two 2x8) above the top plate (the wall is right next to the ...
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1answer
262 views

Can I drill a bathroom vent through what appears to be an exterior joist?

I'm trying to run a vent out from a basement bathroom shower. It's almost exactly in the middle of the lower floor. I can run relatively unobstructed through the space between the joists out to either ...
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0answers
616 views

Holes through plumbers box (double header in floor joist)

A joist is right where the drain is for the bathtub and I am looking for a solution to do the plumbing. Currently, the plan is to do a 'Plumbers Box' in the floor joists which solves the initial issue....
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2answers
679 views

Do I need joist hangers for deck frame on gravel pad? What is the nail size?

I am building 12'x14' detached deck in backyard and away from the house. Frame will be of pressure treated wood sitting on gravel pad. Essentially a rectangle build of 4x6 with one 4x6 in the middle ...
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2answers
9k views

Bracing 2x6 floor joists

I'm wanting to remodel our attic to add a few bedrooms. We currently have 2x6 floor joist that span 16' on one side and 18' on another. All meeting up on the load wall. We were going to sister 2x8 ...
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2answers
836 views

Finding ceiling joists in an old apartment

I'm struggling to find the ceiling joists from which to hang lights in an old apartment. The building is in central Copenhagen and was built in the 1850s, so I can't assume that the joists are spaced ...
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354 views

Sistering 2x8 joists to existing 2x6 under pitched roof

We are going to be remodeling our attic to create 2 extra bedrooms and a living space. Currently there are only 2x6 joist in the attic. We are being told that we should sister 2x8s against the ...
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1answer
262 views

Should one insulate rim joists prior to adding drywall if batt insulation already exists?

Unfinished basement room with 2 exterior walls. Previous owner did the framing and batt insulation. I will finish the room by adding drywall. Should I still insulate the rim joists (adding pieces ...
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1answer
318 views

How should I strengthen my floor joists that are too small?

I have a house that is 120yrs old. The floor joists on the ground floor are only 74mm x 55mm and spaced 350mm on centres. The brickwork that holds up the floor joists is pretty rough and doesn't have ...
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2answers
682 views

What is this metal plate in front of wooden joist for? Can I drill through?

I am trying to install a bike hoist on my garage ceiling, and ran into this piece of metal when drilling through the drywall to the joist: It looks like the material behind the metal plate is wood. ...
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1answer
354 views

Unsupported Subfloor Hanging Over Joist

I'm renovating a 2nd floor bathroom and I made the mistake of cutting out the subfloor flush with the wall shared by the doorway. The problem is that this wall sits between 2 joists so my new and ...
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2answers
1k views

Concerned about roof trusses and ceiling joists in new-construction home [closed]

Found a new-construction home I want to purchase, but I have serious concerns about the roof trusses and ceiling joists. The house is completed on exterior (bricked, windows, and roof completed) but ...
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3answers
6k views

Can I run this pipe through joists?

I have a bulkhead or soffit above our kitchen cabinets that is being removed to make way for taller ones that will go all the way to the ceiling. I encountered a vent pipe that will be in the way of ...
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2answers
4k views

Can I span 23 feet with doubled 2x8 floor joists?

We are remodeling the first floor in our 2 flat. We use it as a single family. Tearing out a wall between kitchen and "second" bedroom from when it was originally built in 1926. The current floor ...
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1answer
934 views

Do I need blocking between 2x8 joists with an 8-foot span in a kid's fort?

About to embark on a DIY project to build my kids a fort. It will be a deck using 4x4's for legs, holding up a box of 2x8's. Three interior joists for a total of 7 2x8's will make up the frame for the ...
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2answers
221 views

Installing a pet door - no ideal location - support beam question

I am in the process of installing a pet door and there really isn't any ideal area in the living area to install it due to either things on the inside that are in the way or on the outside that are in ...
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1answer
249 views

Appropriate fixing to lay joists on top of binders

I am attempting to board out a portion of my attic space for basic domestic storage. Nothing very heavy, just Christmas decorations and the like. The area I wish to board out is the span between two ...
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3answers
5k views

How to properly double on ceiling joists

I'd like to double my ceiling joists to make my attic space easier to work in (for electrical/plumbing) and for lightweight storage. Status Quo: 2x4's (actual size) spaced 16" on-center running the ...
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1answer
240 views

Floors of Bathroom Very Creaky

I recently bought a new house and one of the major concerns I have is the first floor half bath. At and round the toilet, the floor is ridiculously creaky. I'm half thinking I'm going to fall through ...
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1answer
312 views

Which way should my joists run for a tray ceiling?

I'm getting ready to frame in a tray ceiling in my closet. The dimensions are 70" x 30". I was thinking about just using one 2x6 joist that spans the entire length (70") of the trey ceiling right ...
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2answers
3k views

How much weight can my garage's ceiling joists support?

I've got a detached garage which was built in the 1940s and I'm trying to figure out whether it's safe to add an attic ladder and use the attic space for storage. The ceiling joists are 2x6 [pine/fir],...
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1answer
184 views

preventing water from entering my no-step entry

My entry is a no step entry that was poorly conceived by the previous owners. Here are my issues: - Entry door is inset into my home, behind my foundation wall. - I live on a slope, with a circle ...
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1answer
788 views

Can I place ventilation ducting on top of joists if there is space?

I'm installing a ceiling-mounted extractor fan above a kitchen island. The problem is with the placement of ventilation ducting in the ceiling: the joists are running in the opposite direction to the ...
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0answers
150 views

Can a PSL beam support second story joists all hanging from it

My home is a 2 story home, built in 2003. There is one section in the home that was left open to above with approximately a 20' ceiling in this case. This is over the living/dining areas of the home ...
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1answer
1k views

Using 6x6 beams for roof joists

I'm designing my new home. I live in the desert southwest (Nevada). The house will have an adobe style, i.e. it will be 8" cmu's covered with stucco. I will have an essentially flat roof (1/2:12). I ...
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2answers
108 views

Should I remove existing subfloor sheathing before increasing height of the floor system?

We're turning a 13x13 area of attic space into livable space. The new 13x13 area joins an existing room. The attic floor structure is: 2x8 floor joists and OSB board on top. There is a ~5 inch step ...
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1answer
615 views

When to repair engineered floor truss damaged by cut?

While using my circular to cut away rotted subfloor sheathing, I accidentally cut a thin kerf notch into the flat 2x4 top of my engineered floor truss joists. The cut is about 1/2 inch and very thin. ...
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1answer
687 views

Repair or Replace Cut Floor Joist

After removing an old bathroom floor in a historic structure, in order to sister joists for a level surface to install new subfloor, we found that one of the original floor joists was notched, and ...
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1answer
391 views

Accidentally cut through joist above eave [closed]

On the far corner of our carport, I replaced an eave-mounted light a few days ago that had no junction box holding it. In trying to be a responsible DIY-er, I decided to go ahead and install a ...
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0answers
104 views

Bottom wall plate half on parallel joist, safe?

In replacing a bathroom shower stall, we are replacing a piece of sub flooring with your typical shower damage to it. In replacing it, I noticed the exterior wall which runs parallel to the joist is ...
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1answer
111 views

Floor Joist Tolerances

What is an acceptable tolerance for floor joists (subfloor not laid, yet) over a 4 ft span in an old home? How far out (in height) is acceptable?
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1answer
539 views

building a new house, I beams and floor joists different height [closed]

I have one section of the first floor with I beam engineered lumber 11-7/8" joists to span 20 foot area of a 20x20 room, so we have some open space in the basement. The other part of the house has ...
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2answers
360 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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1answer
121 views

Can I use the 6x6 beam in our crawlspace as a “running board” for electric cable?

A portion of our house sits on unfinished 36" crawl space. I need to run some electrical cable (NM/Romex, 14/2) through the middle of the crawl space, perpendicular to the joists. I could drill holes ...