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

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15
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1answer
9k 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 ...
11
votes
3answers
4k views

How do I meet the 7 feet high ceiling requirement after finishing the basement?

My basement ceiling joists are exactly 7 feet above the concrete slab. The requirement for finished living space is 7 ft from the finished floor to the finished ceiling. Since I'll loose a couple of ...
10
votes
1answer
529 views

Are there any dangers to sistering a joist with oversize lumber?

I've done some research lately on joist sistering as a solution to bouncy floors. The logic seems to revolve around the following principles. The stress of carrying a load is at the center of the ...
9
votes
1answer
605 views

How do I get to the wall cavity above a double floor joist from below?

I am running some new romex for a couple of electrical outlets. One of the outlets is on one side of a wall in one bedroom and the other outlet is on the other side of the wall in another bedroom. ...
8
votes
2answers
835 views

Is joist sag at connection with header a problem?

I am having the ceiling in the finished part of my basement redone, and have it fully open now. I can see the connection of the joists to the headers have given somewhat, as the house is 85 years old ...
8
votes
4answers
2k views

Floor joists connection to eaves

Apologies if this is a duplicate. I'm attempting to floor my loft space. It currently has 47mm x 75mm ceiling joists, not enough for a floor. I am going to add something like 47mm x 200mm along ...
7
votes
6answers
967 views

How do I remove floorboard nails from joists?

How do I remove floorboard nails from joists? The nails are ~3-4mm diameter with no heads. I've tried claw-hammer and wrecking bar with no success because without nail-heads, I cannot get purchase. ...
7
votes
2answers
191 views

How do I measure joist deflection?

I have a 3 story townhouse that was built in 2004. We recently redid the flooring in the top floor, and while we had the subfloor exposed we tried to eliminate the squeaking that we've been hearing by ...
6
votes
1answer
1k views

Should I worry about sagging joists?

I have a two story house and some of the joists between the floors are sagging about an inch or two. When I walk around upstairs I can feel the level difference and downstairs you can slightly see the ...
6
votes
1answer
23k views

How do I determine if a wall is load bearing?

I'm considering removing a wall in my master bathroom but I can't tell if it is a load bearing wall or not. I've done a fair amount of research. I don't have the house blueprints, and it's difficult ...
6
votes
1answer
7k views

How can I attach a ledger board to my house?

Spring is here so I finally started to take measurements for materials I will need to build a new deck on my recently constructed home. I just realized that this isn't going to be quite so simple as I ...
6
votes
2answers
2k views

What should I do about a hardwood floor that's sagging between the joists?

I recent bought an older (1890) house. On the original floors, the wood flooring is sagging between the joists--you can feel the height difference as you walk, up and down, up and down. It's firm, ...
6
votes
1answer
503 views

How do I fit a joist in this small space?

This is a follow on question from here: Floor joists connection to eaves Since this question, I have been told I need 8" joists for my span and I have exposed my eaves area to see what space I've ...
6
votes
1answer
499 views

How to properly seal the transition between basement wall framing and spray-foamed box joists?

We're looking at insulating the box joists of our concrete foundation. We have 2x3" walls framed which are holding batt insulation, which are 3-4" away from the wall (to accommodate a layer of batt ...
5
votes
1answer
875 views

Is there a correct orientation for hurricane clips?

When installing hurricane clips to joists where it crosses a beam, is there a preference to mounting the clips on the inside or the outside of the beam? And should the ears on the clips point inward ...
5
votes
2answers
4k views

What size ceiling joists and rafters should I use for a 14' span?

I'm going to build a single story addition to my home with a width of 14ft. I plan on using ceiling joists every 16" but I'm not sure which size to get. The roof will be asphalt shingles and the attic ...
4
votes
2answers
483 views

Is it OK to drill vertically through a joist?

I just bought a new house and I'm looking to run some cables. One of the areas I would like to run it to would require drilling through a 2x10 sistered joist. Realizing that going through the joist ...
4
votes
1answer
318 views

Should I add plywood or OSB between sistered beams?

I'm going to stiffen up my main floor joists by sistering then bridging them. In the past a friend put something in the middle, is that standard? Should I put 1/2" plywood or OSB in between?
4
votes
2answers
340 views

How do I reinforce the ends of 2x8s that are sistered to 2“x5” (actual size) joists?

I want to strengthen the floor of my office. Currently the joists are 2"x5" (actual size). I want to put a 2"x8" (1.5"x7.5" actual size) which will double the existing joists. I will have to reduce ...
4
votes
1answer
382 views

Do the guidelines for holes in joists apply to band joists?

This question have a great answer with all the guidelines for drilling holes in joists. The question: Are the guidelines the same for band joists? A bit of context: I'd like to add an exterior ...
4
votes
4answers
864 views

How do I deal with a joist in the way of where I need to run a pipe?

I'm in the process of installing central vac lines (2" OD) in a finished house, and I am trying to run a line into the upstairs hallway. I have removed drywall in the garage below and drilled a hole ...
4
votes
1answer
2k views

What does blocking refer to in relation to floor joists?

This question was triggered by the following line in a home inspection: Blocking is not installed for I joists above beams in basement. I have found pictures of blocking at ...
4
votes
3answers
823 views

How do I repair a floor joist which has a hole drilled less than 2 inches from the bottom?

I have three floor joists that have approximately 1/2 inch hole in them less than 2 inches from the bottom. Is there a recommended fix or approved method to correct this to meet code? These joists ...
3
votes
1answer
2k views

How can I remove just one tongue-and-groove subfloor board?

I am not talking about laminate planks, but actual subfloor sections. My entire room consists of tongue-and-groove boards. I was under the impression that the point of this was so you didn't have to ...
3
votes
2answers
1k views

How can I hang a heavy bag from this beam in my garage?

I'm renting a house that was built about 10 years ago. The attached, finished garage is under the master bedroom. It has two large beams running across it, see picture. The larger one is 6.5" ...
3
votes
2answers
2k views

What should I do about this load bearing wall that is only supported by a joist floor?

My floors pitch in the same spots as they do on the 1st and 2nd floors. My home was built in the 1890's. I have some soft spots in the basement joists and added 4x4" posts to each side of the main ...
3
votes
2answers
426 views

Is there a way to sound proof my basement while I've got part of the ceiling open?

We had a header beam installed in our basement. The floor joists are exposed for 1ft (~30cm) on both sides for the length of the beam. The basement is an apartment, so I'd like to add some ...
3
votes
0answers
55 views

How can I reduce the bounciness of a floor? [duplicate]

My apartment is on the second floor of a low-rise building. There are no units directly under it; the apartment sits above the open-air garage. I feel basically everything that my next door ...
2
votes
2answers
133 views

Do I need to brace joists after removing basement ceiling?

I'm about to take out the lath & plaster ceiling in the basement of my 1908 house (I'm hiring it out; I know how bad the mess is). Main reasons for doing this are to get access to wiring and allow ...
2
votes
2answers
51 views

How to find joists through sheetmetal ceiling?

I have an antique sheetmetal ceiling of historical importance in my centenarian vintage home. As I am currently in the last stages of installing an AC system and the parts of the house that have ...
2
votes
2answers
1k views

What packing material to use between a brick and house beam?

I'm replacing a damaged beam under my house with bricks under each floor joist. The bricks are 15mm lower than the original beam. I've been told to use roof slates to pack the rest of the height. I'm ...
2
votes
1answer
4k views

How should I add new joists and flooring to a loft space?

First off, basic floor plan of the loft: Hard lines are the walls on the first floor underneath, joists on the first floor landing run left to right so does that mean the central wall running front ...
2
votes
2answers
272 views

Does this ceiling joist layout look structurally sound?

I plan on talking with an architect soon, but wanted feedback from this community too. Please see the attached photo. I'm in Raleigh, NC and am using information from this site ...
2
votes
1answer
45 views

How important is the scoop cut in a drop-in joint?

I've been reading up on joints, particularly drop-in joints. Some of the drawings have a curved cut on the underside leading up to the tenon, sometimes labeled a "scoop cut". Curves make ...
2
votes
2answers
110 views

How do I find the studs on my ceiling through 4.5" of polyiso?

I am starting to install polyiso on the interior of my slanted cathedral roof assembly and am having trouble finding the studs through the 4.5" of polyiso that I have. Things working against me: ...
2
votes
0answers
85 views

What materials and spacing should I use for ceiling joists/strapping in this conversion?

I have an old two bay garage that's 28'x50', that I would like to convert into a home. One thing I'm trying to figure out is how to do the ceiling. The ceiling is held up by metal joists approximately ...
2
votes
1answer
541 views

How can I build a temporary support for rafters?

I have a hipped roof with 5.5 metre common rafters supported mid span by strutted purlins. The rafters, and below them the ceiling joists, are trimmed around a double flue chimney breast at the flank ...
1
vote
1answer
234 views

How can I support a joist length of 9 meters without steel?

I want to convert my loft and need to span 9 meters unsupported. Can it be achieved without steel beams?
1
vote
1answer
91 views

1“ x 2” Furring Strips for Drywall Ceiling

In my basement, there's currently a tile ceiling that's installed on furring strips attached to the joists. The furring strips are 1"x2", attached to the joists by nails. We're currently replacing the ...
1
vote
2answers
2k views

What is the strongest way to join a deck joist to a corner joint?

I'm working on designing the support frame for a deck for my backyard. The basic shape of the deck: It's essentially a square with one corner chopped off. The red line is the joist in question, ...
1
vote
2answers
97 views

Can I drill a 3 1/2" hole through 5 joists?

I need to move a toilet to the other side of room approx. 6 ft I will have to drill a 3.5 in hole for the waste line in 5 floor joist on the second floor. Can I double them and still drill the 3.5 in ...
1
vote
2answers
276 views

Is it ok to sister a joist to burnt joist?

I am about to purchase a house that was damaged in a fire and sitting for 4 years. The fire was mostly contained to a small area, but some joists were burned quite badly, while other just had some ...
1
vote
1answer
2k views

How far apart should timber joists be for an MDF floor?

Background I am starting my first serious DIY project - converting our garage into a playroom for the kids. The garage floor is concrete. My plan is to run timber (Sawn Kiln Dried Timber (L)3000 x ...
1
vote
2answers
788 views

Can my floor support Kitchen Island?

I am installing a 5' x 3' kitchen island consisting of two base cabinets. Once I've installed the two base cabinets, SilestoneUSA will install a quartz counter top. My plan is to screw two ...
1
vote
1answer
2k views

Can I build a deck close to the ground? [duplicate]

Possible Duplicate: Can I build a deck this low to the ground? Every set of instructions I've seen for building a deck requires me to put joists on top of beams attached to posts. But I ...
1
vote
1answer
273 views

What height of insulation should I use between joists in an MDF floor?

Background I am starting my first serious DIY project - converting our garage into a playroom for the kids. The garage floor is concrete. My plan is to run timber (Sawn Kiln Dried Timber (L)3000 x ...
1
vote
1answer
35 views

Can I replace a floor joist cross-brace with two horizontal pieces of blocking in the same spot?

I am doing some remodeling and want to run a 6-inch HVAC (kitchen exhaust hood) duct through the floor joists. There is one section where the path is impeded by a standard floor joist cross-brace. Can ...
1
vote
2answers
688 views

What is the best way to hang a heavy dynamic weight from a flat ceiling with joists?

I want to hang something like http://www.skychairs.com/ or similar in my living room. If the joists were exposed I would mount a beam between two of them and hang over or through that. However, when ...
1
vote
3answers
4k views

How should I use fiberglass batts to insulate between floor joists over a stone basement?

I have an old home built on a stone foundation. The stone foundation is solid, as well as the floor joists. I run a dehumidifier in the basement full time, to keep the air moisture low. There is ...
1
vote
1answer
1k views

How should I attach a chin-up bar to floor joists?

I want to mount a chin up bar to engineered I-beam floor joists. Am I safe to mount it directly up into it with lag bolts? If the spacing isn't correct and I span some joists with 2x4s, should I run ...