Questions tagged [joists]

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

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4
votes
2answers
119 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
139 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 ...
2
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1answer
60 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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0answers
49 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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0answers
40 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 ...
1
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1answer
59 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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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 ...
2
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3answers
487 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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1answer
59 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 ...
5
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2answers
559 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 ...
1
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2answers
49 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 ...
1
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1answer
67 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
48 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 ...
1
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1answer
84 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?
2
votes
1answer
68 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 ...
0
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2answers
39 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 ...
4
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3answers
131 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 ...
2
votes
1answer
102 views

What is this thing inside ceilling?

I am trying to figure out whether wall is load bearing or not. I am in 2nd floor of 3 storey condominium building. To figure out which way joists run, I cut rectangle in ceilling near the wall. I ...
0
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1answer
89 views

Joist hanger too low?

I'm in the process of replacing the joists in a room in my 100 year old house (original members were too far gone with termite damage to do sistering). Original joists were true 2x8s with a 12 foot ...
0
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2answers
103 views

Do joists need to be attached to the beam they're resting on?

Installed a 2 x12 x10 header opening that supports the above floor joists. Wanted to know if the header needs to be toenailed to each joist resting on it?
0
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1answer
59 views

Building a raised platform fort

I want to build a 4m x 5m raised platform for my kids fort. It will be 2m high. I have a few questions: It is OK to attach the posts at the corners or will I need more in the middle? What do I ...
0
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2answers
100 views

How to safely make space for attic ladder installation

I want to install an attic ladder in the ceiling of our 1930s house. There is no ideal location in which the attic ladder would fit between the ceiling joists, so a joist or two will definitely need ...
7
votes
5answers
3k views

Repairing a notched floor joist

Situation I was running some new gas pipe and I notched one floor joist and drilled a hole in another. I have now learned that this is not appropriate. This was in the forbidden zone of the middle 1/...
1
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1answer
142 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 ...
2
votes
2answers
118 views

Should I be concerned about the size of a hole and notch in my joist?

We've just had the house re-wired (UK), and were wondering whether a hole and notch the electricians have made will significantly weaken the joist? It is the end joist in the room. Joist dimentions ...
2
votes
2answers
78 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 ...
2
votes
2answers
84 views

Attach Deck Joists at 45° angle without Hangers

I'm building an octagonal freestanding deck and having trouble figuring out how to attach some 2x6 floor joists to a rim joist at a 45° angle without having to buy angled joist hangers for $6-$11 a ...
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2answers
108 views

Is this loft bed flooring strong enough?

I'm about to construct a loft bed as in picture: it's 240cm long and 180cm wide (7.9ft x 5.9ft). The floor frame is composed of 2 main beams (2x6) that run on the longitudinal direction, and 7 joists ...
1
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1answer
41 views

Removing or modifying bridges between truss or joists to make way for ducting

I want to run ducting for a kitchen extractor through the ground-floor ceiling of a two story building in order to get it to an external wall. The ducting would be running in the same direction as the ...
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0answers
60 views

Options and advice for two-point aerial yoga hammock

I'm looking to hang an aerial yoga hammock in our garage from 2 attachment points. I'm based in Australia which might change some of my measurements/ratings so sorry in advance! I can use a manhole ...
3
votes
3answers
59 views

Can a larger joist be trimmed and have it perform as a smaller joist?

I've got a lot of 7x2 joists left over from a previous project. Now I have a new ceiling to put up but they require only 5x2 joists, so I'm thinking of trimming the 7x2 so as not to have them go to ...
1
vote
1answer
28 views

Necessary to sister joists in skylight frame?

Piggybacking on my previous question about the headers in a skylight frame (Double header for skylight frame), I'd like to know if it's required to sister the uncut joists on either side of the ...
0
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2answers
186 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 ...
1
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1answer
188 views

Contractor cut joists short (followup to earlier question)

We are removing a couple of load bearing walls as part of renos in our home. The engineer specified a W8x21steel beam to replace the load bearing wall. The floor joists are 2x10. The joists are 2x10 ...
16
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5answers
14k views

Contractor cut joist hangers to make them fit

(edited with additional info re. header) We are removing a couple of load bearing walls as part of renos in our home. The engineer specified a W8x21steel beam to replace the load bearing wall. The ...
0
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1answer
158 views

Any experience with Metwood joist reinforcers?

Does anyone in the group have experience using the following product from Metwood to reinforce joists that had to be to cut to route plumbing drains/pipes? https://www.metwood.com/product/1-...
2
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1answer
73 views

What is the most cost-efficient design of a 16' temporary wooden ramp?

I need to build a 2'x16' ramp to load a shipping container on a semi trailer. What is the cheapest design of 2x boards and plywood to do this with? EDIT: I have now built this ramp and used it ...
2
votes
3answers
120 views

How to cut hole larger than 1/3 of joist?

I need to run a toilet drain (3”) through three joists (9 1/4”). Code states holes in joists can not exceed 1/3 the size of the joists. Catch is for 3” pipe I need a 3 5/8” hole — which is larger than ...
0
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0answers
59 views

Soundproof Garage Ceiling

I’m building a soundproof room in a garage for a friend, after having done something similar for myself, but am not sure about the ceiling. I was planning to use two layers of acoustic plasterboard (...
0
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1answer
64 views

Double header for skylight frame

I'd like to install a new skylight in my dining room. The skylight is 30x30 and will require one ceiling joist to be cut and (2) new double headers to be installed. Do the new headers need to span ...
29
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5answers
6k views

Is it safe to remove the bottom chords of a series of garage roof trusses?

See attached picture. Looks like an 8x10 cut-out. He wants to lift cars up so he can walk under them. Is this safe? Doesn't removing the joists affect structural integrity?
3
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2answers
366 views

Run conduit perpendicular to ceiling joists in garage

I have a sub panel on a finished wall in my garage. I want to add two 20 amp circuits and run them go outlets on two unfinished walls on the sides of the garage. Is it okay to run metal conduit ...
1
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0answers
32 views

Joist span for grade level deck

I have a sunken backyard concrete patio which is sloped for drainage. The slope reduces usability for sheds, BBQs, picnic tables, etc. The space is approx 15' x 25', with concrete walls on 3 sides. ...
0
votes
1answer
30 views

What fasteners to sister LVL to 2x6 joist?

We live in an antique cape and have 2x6 joists. My builder is making extra headroom for a staircase in our living room which involves reinforcing a couple joists with 2x6 LVL. Which is the best option ...
3
votes
2answers
75 views

Joist design for shed/workshop

I am in the process of building a roughly 12' x 16' shed/workshop. It is going to be a pier-and-beam design. There are 8 concrete piers, 4 on each side, that will support 2 4x12 beams. The span from ...
0
votes
1answer
24 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 ...
1
vote
2answers
107 views

How much weight can threads hold?

I'm building a pot rack that will hang from my ceiling and I want to make sure it is secure. I rigged up a hanging apparatus that consists of a 1/2" x 12" bolt, two lock nuts, a 3/8" pipe floor ...
1
vote
1answer
84 views

Running wire through ceiling, ceiling joists blocking access to the top of the frame

So I was in my attic last night, about to drill some holes in the top of the wall to run CAT 6 ethernet cables down the wall. I found above the wall is two parallel ceiling joists that are completely ...
0
votes
0answers
75 views

How to frame corner of staircase header for a stairwell opening? Do you use a hanger here?

I'm designing a staircase and was a little curious on how to frame out the stairwell opening where the header meats the existing joists. There will be a double 1.75"(x2) LVL header joined up against ...
1
vote
2answers
387 views

Cut Floor joists for HVAC

I own an old home, circa 1919. In the 70's, when the new furnace was installed, they cut through the floor joists to run the air ducts. Awesome. So in direct correlation to those cut joists, are ...

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