Questions tagged [joists]

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

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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 ...
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1answer
875 views

Shimming a Floor Joist

I've got a floor joist that is low between 3/16 and 1/2 in. Because of its position, I can't sister it. How can I level it? Can I rip a 2x4 and glue and screw it to the top? Would it be stable or ...
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5answers
5k views

Can I cut a hole in a 2“ x 8” joist that is less than 1/3 the height of the joist, leaves at least 2“ above and below the hole, but is 10” wide?

I would like to redirect a 5" air pipe to the other side of a 2" x 8", second story, floor joist so that I can have the vent exit a bathroom vanity kick plate. I realize I cannot just drill a 5" hole ...
4
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1answer
1k views

Joist re-enforcement instead of sister

So I've got a scenario where I'd like to re-enforce my joists, and I don't currently have the ability or time to sister the entire length of the 12' joists. Now I could remove blocking, insulation, ...
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2answers
459 views

How do I repair deck sloping on one side of the house?

I'm in Jonesboro, GA. My deck is about 3 ft off the ground. I have a crawl space. The deck is leaning/sloping down from the house on the left side. I looked at many youtube videos and found the ...
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2answers
623 views

How Do I Level Joists for a Subfloor?

I'm renovating a 4x5 ft. bathroom and I'm having problems leveling the sistered joists with the existing floor (the doorway). I've clamped the new sister joists to the old ones in order to see how it ...
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1answer
182 views

Trying to hang my self-made gymnastics workout machine in my garage

I basically made this machine referencing two videos: Power Moves Training System How to Make Your Own Breakdancing Flare Trainer Mine is a tiny bit different than both but same basic design. It's ...
7
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6answers
3k views

Increase size of ceiling joist compromise roof strength?

I am in the middle of renovating my home and discovered a major problem in my livingroom. The room is 20 feet by 20 feet (400 sq ft) and the ceiling is built out of 2x4s spaced 24 inch on center. Each ...
8
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2answers
1k views

Structurally required? I-beam support under stair opening header

The stair opening into my basement is framed like this: A partition wall (non-load bearing) sits on top of the header. A square duct runs parallel to the header, and on the other side of this duct ...
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1answer
1k views

Can I run NM 12 ga circuits on a running board or MultiCable Staples across floor joists use in a basement with an unfinished ceiling?

The original wiring (1994) is along the best route where wires are stapled at the top of the interior wall plate above the finished drywall. I want to run 4 new circuits, but there is no room to ...
2
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1answer
381 views

I need help supporting and jacking up my attached, wood front porch

I live in Ohio in a home built in 1926. I do not believe the front porch is that old. The porch is L shape, wrapping around the house and is 24 X 8' in the front extending another 14' back, with ...
2
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1answer
833 views

Can I attach a freestanding deck to concrete block garage wall?

I'm certain you can't attach a ledger to cinder block that is why the deck is going to be free standing. However, I would like to know if the deck could somehow be secured to the garage. Kind of like ...
1
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1answer
90 views

What length header should I consider?

I have 2 bathroom remodeling we are planning on the 2nd floor of 2 storied house. I want to carve out part of the bathroom as laundry room where Washer (27") and Dryer (27") will be stacked in a ...
3
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1answer
1k views

Help running ethernet between floors, with double joists in the way

I will like to redo the existing Ethernet (and maybe COAX) wiring in my home. I have looked for the most ideal path from the basement through the floors into the attic and then drop into the second ...
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1answer
1k views

Which trade(s) should I hire for structural repairs?

I need some structural repairs done to the floor joists of my house. Which trade should I contact for quotes? I was initially thinking about getting a structural engineer involved directly since I ...
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1answer
1k 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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2answers
191 views

Will a C16 deck joist (about 2“ by 5”) span 3m (about 15 feet)?

I'd like to add a decking to my garden, dimensions are 5m width x 3m depth. Am planning to have 3m joists laid vertically (about 50cm apart) and 5m decking boards horizontally As the soil is not very ...
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1answer
221 views

Are there any restrictions for drilling holes in solid lumber joists regarding how close to the ends of the joist? [duplicate]

I've read to not drill a hole greater than 1/3 the depth of the board (I want to drill a 3/4" hole in a 12" board for wiring, so that won't be an issue) as well as not to do it within two inches of ...
1
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1answer
3k views

Which nut/washer combination to join timber to timber (joist to rafter)

I am fitting some new joists in my roof and will be bolting the new joists to the existing rafters. Both joists and rafters are 47mm thick. After some advice from a friend (which may of course be ...
3
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1answer
1k views

Will my existing deck support the weight of a new hot tub?

I have a hot tub on my deck. I'm ready to fill it but now wondering about the weight on it. The deck is 10' wide with 2x8 joists on 16"centers. The tub is 7' x 7'. When filled with water and people ...
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2answers
1k views

Why are top-mount joist and purlin hangers shorter than actual lumber dimensions?

Looking at the load tables for various products, purlin hangers are often shorter than the actual size lumber they're supposed to hang: USP JPF USP HL The size difference seems more consistent at ...
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2answers
1k views

Metal bracket to hang stringer below joist?

I need to hang a stringer (basically another 2x8) right below my deck joist 2x8. Look like this photo Can you tell me what kind of hanger / bracket is it in the red circle? The article is from here ...
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2answers
2k views

What to use as a spacer where deck joists overlap?

I have a long deck that must do sister joists on top of a beam. I was reading this thread Is deck joist sistering a sloppy repair? and look like it's better to use spacer in between. Is it OK to use ...
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1answer
581 views

Cutting joist for skewed joist hanger

Do I need to cut the joist lumber's end at an angle so that it sits flushed to the beam when installing skewed joist hanger? The below video tells me that it's not necessary. https://www.youtube.com/...
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2answers
1k views

Can I frame over an existing deck with a new deck to raise the level?

I was looking at below photo and realized they basically put the trim joists of the platform on top of the bottom joists / beam. Is that allowed? I thought you have to actually put footings for the ...
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1answer
217 views

Does the granite countertop on my deck require separate footings?

If I want to have a granite countertop as a table on top of my deck, do I need to support the 4 corners with actual footing, like 4x4 with concrete? Or it is possible to just bold the 4 legs on the ...
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2answers
1k views

Do I need ledger board when expand deck?

I have a deck like below and I want to expand the direction where the arrow shows (sorry for an ugly photo). Do I need to put a ledger board right on the trim joist, or can I just hang the new joists ...
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1answer
203 views

Different joist spacing of extended deck

I have an old deck with 16" joist spacing but that was because they used 2x8 joists and span 9 ft with 3 ft overhang. I am planning to extend the deck but won't go further than 9 ft. So with short ...
2
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2answers
122 views

ceiling joist storage expression

I have pre made truss ceiling joist in the garage. The joists are 2x4x21'. I want to use space above the joists for storage. I want to sister a 2x6x21' or 2x8x21' next to 2x4x21' is this ok? If ...
2
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1answer
2k views

Adding more floor joists in a crawlspace. Originals are 5' OC and need more support

I just bought a 1956 ranch house in Portland, OR and am facing an issue. I've gutted the bathroom for a remodel and it's down to the studs. There was a bit of water damage to the subfloor around the ...
6
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2answers
1k views

How to improve wooden joists without removing them

First floor bathroom in a Victorian terrace house. Floor joists run left to right with floorboards laid front to back. Joists are approx 10 foot long. At some point in the past, the previous owner ...
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0answers
108 views

Sistering joists supported by concrete block on each side

I am going to start a kitchen remodel on a mid 40's home that is constructed with concrete block on all exterior and filled concrete block center wall up to the second floor. Floor joists span approx ...
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1answer
114 views

Are outer joists a different distance in “on center” floor framing?

I've watched some videos and talked to a contractor buddy about how to do floor framing. "16 inches on center" is the phrase I keep hearing, and I understand that that will ensure a layout divisible ...
1
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1answer
813 views

Need to find out if this is a load bearing wall on my second floor

I have a desire to open up my second floor to make one big room (it's my bedroom and want a king size bed and closet). The room is currently split about 65/35 by a wall that does not appear to be load ...
1
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1answer
503 views

Should I use non-shrink grout to help with support posts?

I am installing a new, approx 16' support beam in my house, to be held up initially by adjustable jacks, and permanently by 4 4" wooden posts. Some time ago I saw on one of the construction shows an ...
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1answer
2k views

Is this foyer (wall) load bearing, in a condo

I live in a 5 story condo, on 2nd floor. I wanted to remove this foyer (in picture labeled as ENTRY). I see joists running across the room, left to right in the picture. The structural engineer came ...
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3answers
6k views

How can I repair the end of joists sitting in brick pockets?

I have 2x8 joists over an 8 foot span that were eaten by termites on one end. I need to repair all of the joists in a small room. The building is double wythe structural brick that is approximately ...
17
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3answers
12k views

Is notching a flange on an I-Joist ever acceptable?

My home builder said that the following notch in a flange on an I-Joist was acceptable, but I've read that you're never supposed to do so. Is that true?
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3answers
4k views

Joists have different height

I'm first time homeowner and bought a house (built in 1999) in fall of 2015 (Philadelphia suburb). During inspection of the house I noticed squeaky floors and inspector said its due to nails rubbing ...
0
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1answer
126 views

Add bracing to I-Joist

I am trying to build a non-load bearing wall parallel to the I-joist in my basement. I know that I need to add bracing to span the gap between the wall and the joist, but I am slightly confused as to ...
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2answers
2k views

What is the recommended post cap or strapping for corner post under beam and rim joists?

I'm trying to find the appropriate strapping to secure a beam to a post, while providing a means to attach a double rim-joist. Consider the drawings below: In both of these drawings if I use a post ...
2
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1answer
1k views

What is the proper hole size to drill through joists for wiring? [duplicate]

I am running CAT6a wire around my house and I was wondering what the maximum hole size I can drill to run cable across the joists in my basement to various rooms. I should measure but the joists are 2 ...
2
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1answer
1k views

Calculating floor load strength

Well I'm sure this had been covered over and over. I could not find the formula I seek. I'm building a storage room in the back of a large steel building on my property and I was thinking I'd use the ...
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2answers
17k views

Can I use a 2x8 for a ceiling joist and rafters on a 16' span?

I'm planning an addition which will be 16' wide by 27 feet long overall. the roof will span the 16' dimension. my question is, if there is no plan to use the space above the ceiling for storage or ...
1
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2answers
174 views

Mounting pull-up/exercise beam in corner above window

I'm considering mounting a beam for climbing exercise equipment similar to what is pictured below (see here for complete details): The set up (in my case) would consist of two 20" 2x8 base boards ...
2
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0answers
104 views

Will my garage truss and beam configuration be adequate for a room in the attic?

I am getting ready to finish some of the space above the garage and have some questions. I am located in Pittsburgh, PA. The garage is sloped on both sides down to the floor. I was going to utilize ...
2
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2answers
8k views

Is deck joist sistering a sloppy repair?

I have a few bad deck joists that I replaced with new PT joists. These repairs are great. Now I have a few more not too bad joists that will be rotted in a few years. I am thinking to add new PT ...
6
votes
1answer
5k views

Is a toilet drain permitted to run through I Joists?

It was suggested by a plumber, but is it common practice? The I joists are 11 7/8" but a 3.5 or 4" toilet drain line seems like a large hole to be cutting even if it's in the middle of the joist's ...
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3answers
14k views

Load capacity of 2x4s spaced 16"

We are trying to finish an above garage attic space as a playroom (since the ceiling will be slanted - 7' to 4' headroom). The "room" is 25' x 8' and currently has 2x4s that are 16" apart. My current ...
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1answer
749 views

2x6 deck joists: salvageable or need replacing?

We have a roughly 10x30 elevated wood deck off the pack of our house. The joists are all 2x6 16oc. The posts are 4x4 and are holding up a beam that the joists hang off of with joist hangers. I feel ...