Questions tagged [joists]

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

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1answer
34 views

Floor Sag at Return Duct

I am working on a remodel where the floor is sagging in a particular area. After pulling up the subfloor, it turns out that there is a return duct under that section that goes into the wall for the ...
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2answers
2k views

Why does the maximum deck overhang sometimes decrease with joist spacing?

The deck construction guide for my area contains this table: Look at the "Allowable Overhang" columns. It's odd that a wider joint spacing (24") permits a longer overhang. For example, look at the ...
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1answer
44 views

Running cables for a home theater: inside walls and ceilings or on the surface?

I am trying to set-up a home theater in my ill-equipped living room. After spending the last three days watching YouTube videos on routing cables, I did learn a lot, but got into a state of analysis ...
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1answer
61 views

Lower attic floor joists to increase head room

An old home I am interested in buying has 10' ceilings on the main level and an attic with 7' clearance. I would like to replace the ceiling joists (or attic floor joists) in order to lower the main ...
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2answers
133 views

Is there code compliant way to attach deck joists below a deck beam (or at least lower than flush with the top of the beam)?

I am trying to design a roof top deck above a flat roof on a row house. The deck must bear on the parapet walls (4 layers thick structural brick walls on both sides of the roof), it can not bear on ...
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39 views

Can my second floor support a marble bathtub?

I have a marble bathtub that weights around 2400lbs which I have calculated is about 42 cubic feet; capacity of 314 gallons of water (@8.3lbs=2600lbs). The total weight of the bathtub with water and ...
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3answers
66 views

Do I need rim joist for this tree house platform? What will happen if I leave them off?

Because the angle is odd and the trees are not parallel my idea was to put everything up as is, tack the decking on and then strike a line on the joists to cut them exactly so they're even. You can ...
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2answers
432 views

Remove the wall which am not sure is load bearing wall

I have removed a stair wall but not sure if it was a load bearing wall or not. That’s a stair wall and the house is townhouse and on top floor the wall is not attached to the loft. Added a picture ...
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1answer
34 views

Treehouse joists on beams or beside beams?

Looking at treehouse plans online - sometimes you see joists on top of the support beams, sometimes it's all one layer using joist hangers. Is it best if joists are on top or does it matter? Here is ...
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1answer
168k views

What are the guidelines for holes in joists?

I've been unable to find a good reference for the size/amount/location of holes I can drill through joists. This is mostly in order to pass cabling or pipes through the joist crosswise. Also, what ...
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2answers
46 views

Is it a structural wall

So my adult kids started working on the kitchen-they were planning to remove a wall that runs perpendicular to the peak (along the cross-joists, so we thought it wasn't a supporting wall). After ...
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1answer
330 views

Is joist blocking safe on these old warped joists?

I purchased a house built in 1960 and like other people have mentioned the terrible bounce, I got the same exact situation. I'm thinking of installing blocking to strengthen the floor. The 7 joists ...
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1answer
1k views

What's the best way to insulate an attic with 2x4 joists?

My 1938 home currently has zero insulation (aside from a few fiberglass batts haphazardly tossed about). The ceiling joists are 2x4 (spaced 16 inch OC), rather than the more modern standard of 2x6 or ...
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1answer
333 views

Floor sagging between joist- please help

I recently bought an old home- 102 years old and have some flooring issues. The long story is we bought it knowing it had foundation problems in the rear right corner. The home had a poured concrete ...
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1answer
39 views

Porch swing Supports

Trying to hang a porch swing but the overhead structure isnt conducive. Joists are all 2x6 that run perpendicular to the direction I need to hang the swing. I’m thinking of putting a couple 4x4s in ...
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29 views

Garage Ceiling Truss Load and Distribution Options for Overhead Storage

Last summer I hung two 4'x8' overhead ceiling racks by using 4x4's across multiple trusses. The only point that actually share a truss are the mounts closes to the wall. As janky as this is, It's ...
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1answer
111 views

Is it OK to drill/notch an end joist (not rim/band joist) as long as it's continuously supported by a foundation wall?

I'm in the process of trying to run some CAT6 and speaker wire at various places in my house. One of the things I'd like to do is run speaker wire in the living room to a wall plate behind my sofa, ...
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1answer
49 views

Floating Dock Framing Length?

I'm planning on building a floating dock and am looking for advice on framing. More Specifically, i'm wondering if anyone knows what the maximum length I can span between two floats? I inherited ...
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1answer
32 views

Leaking PVC pipe & joist notch

I appreciate any help with my problem below. I have a PVC drain pipe that is leaking. The drain pipe is from a tiled shower floor. It looks like the joist is pressed up against the pipe elbow and ...
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1answer
40 views

Do I need to remove mould from plywood before treating?

I have a shed base on piers topped with plywood that was finished last Winter and covered up to help protect from the elements. However some water made it through (or general dampness of being ...
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2answers
83 views

Do my HVAC ducts need to hang away from floor joists?

I have a basement that I would like to finish and install a drywall ceiling. And I would like that ceiling to hide the HVAC vents. However, the vents already just (by an inch or so) go over my head. ...
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2answers
63 views

How to install a door in a load bearing basement wall that is only 80 inches high

I would like to install a door in a load baring wall in my basement that is only 80 inches from the floor to the joist. It's an old 1940s home where half the house has joists running east west and ...
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1answer
52 views

Which insulation technique should I use to insulate my subfloor?

I'm converting a carport into heated space and decided to install a subfloor to raise the room to the same level as the rest of the house. I have roughly 1"-3" of clearance below my floor joists, so ...
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1answer
506 views

Removing diagonal truss brace?

Looking to put insulation, plasterboards on the garage ceiling and some down lighters, Not a massive amount of heavy stuff is currently stored there (primarily boxes etc). There are 5 joists, joist ...
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0answers
42 views

hanging a load from engineered I-joist ceiling

I'm trying to figure out the best method to hang a light 4x8 trailer that weighs just under 300lbs from my garage ceiling to store it. I'm planning to use a light electric hoist or ratcheting hand ...
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1answer
31 views

Remove damaged flooring under edge of fiberglass tub and direction of new underlayment

I am currently living in my grandmother's old house (built ~1940 or before) where I have yet to find any previous repairs done correctly. The house is a two bedroom, one bathroom mill house type ...
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2answers
621 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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2answers
225 views

Replacing ceiling joists with rafter ties higher up on the rafters

I'm trying to help my grandfather plan for a remodel of his 1950s home. The original structure is 24x24' with 6" rafters spaced about 20" apart on a 6/12 roof. He'd like to be able to have a "vaulted ...
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4answers
892 views

Do I need a nailing edge around the perimeter of my room for my new AdvanTech subfloor?

I have torn out the original flooring from by 1910 Victorian so that I can level the joists and install new sound subfloor. I'm using 3/4" AdvanTech T&G subfloor, glued and screwed to the new ...
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3answers
91 views

Mounting a ceiling fan with 28” joist spacing and no attic access

Is there a decent way to mount a ceiling fan between joists that are 28” apart without tearing apart the ceiling? I don’t have access from above. I looked into the expanding bar hangers that I can ...
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1answer
197 views

Strengthening existing 2x4 joists to create a mini attic

Between the first and second floor of a friend's house he has about 4' of dead space that he wants me to help convert into storage (this is in San Francisco, so every square foot counts!). He got the ...
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2answers
137 views

Contact surface between subfloor and joists

I had to remove portions of the existing subfloor chipboard panels (18mm depth), which now I need to replace (I already bought a new P5 panel). The problem is that one edge of the hole is irregular, ...
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4answers
179 views

Lifting 200-300 LBS with 2x8 wood - design question

I want to lift the body off my 66 VW (not the whole car). Since I already have a 450 lb rated hoist, I decided to take an advantage of it and use it for lifting. This comes handy specially when try to ...
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1answer
106 views

Roof Rafter/Beam Joint pulling apart and sagging

There is a joint in my attic where 4 beams or rafters meet. Someone used a 2x4 to support one of the beams, but it did not work because the beam was in two sections.As you can see in the pictures, ...
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58 views

Does this joist need to be reinforced?

I'm running some wiring and came upon this. One-story 1952-ish house. Joist is 2x10. Pics are before and after removal of some "support" piece. Looking up at the basement laundry room ceiling. It'...
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102 views

Hanging Ceiling Joists UNDER New Attic Header?

I’m opening a load bearing wall between the kitchen and living room. I’ve overcome the offset basement girder with two new posts under the joists that will carry the new header load down from the ...
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2answers
115 views

Is it ok to insulate external cantilever floor joists with foam board to fix cold floor?

We have very cold floors in the kitchen because the outside air is moving up through the external cantilevered floor. I'd like to insulate it by cutting 2" foam (probably XPS or Polyurethane) and ...
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1answer
130 views

Fastening ceiling box to side of joist

Is there such a ceiling junction box that will allow me to attach it to the side of a joist from inside the box? NB: I have a finished ceiling. I know I can install a support bar and attach a box to ...
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3answers
563 views

How should I deal with lumber size differences when replacing floor joists?

I am in the process of replacing 4 floor joists and the new 2x10s are 1/4" taller than what was previously there. I understand that as the lumber dries out it will shrink but how do i handle the 1/4" ...
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0answers
32 views

Sistering to repair sill sag

I just bought a house that had had a water issue around the sill plate. I am going to replace the sill soon but the water has caused a few of the joists to sink about 1/4". How long do the boards i ...
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1answer
65 views

Are these boards above my garage structural?

I started laying out some plywood for storage above my garage, and was wondering id these 2x8's can be removed to make a flatter space. I saw someone refer to them as "catwalks", though I can't find ...
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2answers
54 views

How to mount load-bearing assembly meant to be installed into joists

I recently got the below ceiling-mounted pull-up bar that installs into joists with 3" lag bolts. Unfortunately, my joists run perpendicular to the direction that I want to install this bar, so I need ...
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2answers
641 views

Can I drill vertically through this from the main floor to the upstairs?

I made a large hole in my wall with hopes of fishing a wires from the main floor to the upstairs. I'm wondering if I can drill vertically through this. I'm asking because it looks integral to the ...
2
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1answer
97 views

What size should sistered joists be when repairing a cut joist?

I need to repair a cut joist in my kitchen floor. I was going to use a header and sister the joists on either side of it. Question: how do I know what thickness of a header I should use? What about ...
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1answer
273 views

Can I install attic ladder perpendicular to joists?

I only have one area in old house on the 3rd floor where I can put a pull down attic ladder. That is a narrow hallway but the ladder would need to be installed perpendicular to joists. It is an old ...
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2answers
53 views

Should I reinforce the floor over my basment to tile bathrooms?

I want to tile my bathrooms in the house I'm remodeling. They are over a basment with 2x8 joists 16" on center. The span over the basement is around 12ish feet. I put 3/4 OSB and plan to put 1/2 ...
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1answer
105 views

Why is this ceiling joist cut off on both ends?

Why would this ceiling joist be cut short on both ends, and a flat board be put in the place of the part of the joist that was cut off and removed? Is this a problem I need to fix? If so, how?
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2answers
41 views

Remodel Planning - working with or fixing present issues

I own a house in the PacNW, and am starting to plan out a fairly extensive remodel. The house has issues, however, that I want to fix or work around, and I am trying to get an idea of how extensive ...
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3answers
257 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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3answers
232 views

Is there a simple way to make these rough sawn, exposed joists level and flat?

I am renovating the kitchen in my 100+ year old American Four Square home. I was unfortunately not able to salvage the original longleaf pine flooring, so it has all been pulled up. I'm left with ...

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