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

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1answer
154 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 ...
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2answers
31 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
56 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 ...
5
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2answers
428 views

Is there a limit to the number of holes bored in a joist?

I already know that a hole bored in a sawn lumber joist cannot be within 2" of any edge or any other notch or hole. And that the hole can only be a maximum of 1/3 the depth of the member (...
2
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1answer
67 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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1answer
51 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 ...
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1answer
51 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
33 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 ...
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2answers
63 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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2answers
68 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
44 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 ...
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1answer
28 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....
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3answers
1k views

Knee Brace support Hanger for Treehouse

I am going to be building a Treehouse soon, and am researching the best and most cost effective means to do so. I am good on the platform and beams (using Treehouse Attachment Bolts), and am going to ...
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1answer
64 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
79 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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2answers
35 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 ...
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2answers
349 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 ...
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2answers
25 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 ...
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1answer
146 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
142 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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1answer
31 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 ...
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0answers
22 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 ...
2
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1answer
48 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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1answer
84 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 ...
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5answers
1k views

How to support the subfloor around a toilet between I joists

I'm replacing some rotted subfloor around a toilet, and I want to add blocking around the flange for extra support, and to give me a place to support the new pieces of subfloor (I'm not planning on ...
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1answer
84 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
220 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 ...
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3answers
2k 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
186 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 ...
5
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3answers
2k 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 ...
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1answer
38 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
234 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 ...
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1answer
107 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 ...
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2answers
184 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 ...
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2answers
53 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 ...
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0answers
65 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 ...
3
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1answer
471 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 ...
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2answers
127 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 ...
6
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1answer
240 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 ...
2
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1answer
308 views

Can rigid foam board have an air space between it and rim joist?

I am insulating my rim joists with 2" rigid foam board. Most of the rim joist is bare, and the foam fits along it nicely. Some sill boxes have some small irregularities (vent pipes, plumbing, etc) ...
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1answer
50 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 ...
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0answers
150 views

Installing a floor for storage above detached garage?

We have a gabled-roof single-story detached garage with horizontal 2x4 beams spaced four feet apart and a 20' span. There are two vertical 2x4 beams connecting the two horizontal center beams to the ...
6
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1answer
840 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 ...
3
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1answer
226 views

Where in the span of a floor joist can I drill holes to run wiring?

How far from the end of a 2x12 or 2x10 floor joist can I drill a hole? NEC 502.8 does not give this answer, only that you have to be 2" above or below the edges, not in what part of the span it has ...
2
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1answer
235 views

Hurricane ties installed using joist hanger nails top AND bottom. Should I yank them out?

I'm using double sided hurricane ties to secure my joists to my beams for a deck I am building. The tie looks like below: I had been using 1.5" joist hanger nails for the 6 holes at the top that ...
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1answer
330 views

Modifying bottom chord of roof truss to accomodate new AC

We just had a new AC air handler installed, and it's much taller than the old one. Due to an error on my part, it's actually too tall for the space. And it is deeper than the space between the trusses....
0
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1answer
57 views

Finding a stud in a highrise appartment

I would like to install my xpole in my apartment but I am unable to find the stud in the ceiling. According to my stud finder the entire ceiling is metal. Can anyone help? I am in a 24 story ...
2
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2answers
122 views

Structural cross joists and load-bearing walls (century home)

I have a friend that recently took possession of a century home. Its a 4 plex and He was told it was an old school house (at least at some point in time). We’re experienced weekend warriors but ...
5
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4answers
126 views

How to install 2x10 joists of slightly different sizes?

We are trying to install the joist hangers and the joists, but the 2x10s are slightly different sizes. The problem is that some of the boards are 9.25" and some are 9.5" and some in between. So if all ...
2
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1answer
159 views

Floor joist attachment improvements in presence of existing ledger?

TL;DR: AFAIK there are no joist hangers that can be retrofit in a location where there's an existing ledger board without removing said ledger, right? Is there anything I should think about aside ...