Questions tagged [engineering]
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LED ceiling light flashes when another light is turned on
I have a circuit with 3 Leviton smart dimmer switches that control 3 different LED ceiling lights, 1 on/off bathroom fan, and 1 on/off LED light. Whenever the 1 on/off LED light is turned on, 1 and ...
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How much weight can a 9 foot tall 3.5" x 1/4" thick hollow square steel tube hold vertically when used as a column
I am trying to get an idea of how much load / weight (2) 9 foot long piece of 3.5" x 3.5" x 1/4" thick hollow square steel tubing can support when used vertically as a column. The ...
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Geopolymer injection
Does anyone have experience with foundation repair using geopolymer injection?
My foundation has a settlement issue mostly due an expansive fill soil.
I've been discussing it with a local geotechnical ...
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I want to build an all metal, self-designed building. Are metal frame and joists really that infeasible?
I have been putting together plans for my dream house. First an architect friend of mine said she might help, but right now she's got too much business and she hasn't even had time to look at a ...
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Trying to determine safe header span for clear opening on existing remodel
I have a house which has a footprint of roughly 40 feet long and 24 feet wide. On the side in question, one of the 24' sides, there is an existing 4 panel glass door system in place. This room has 10' ...
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Help deciphering rafter span table from International Residential Code [closed]
I want to have a better understanding of how to read the IRC rafter span table - Here's an article which shows a couple of tables which I am including here.
Now let's say I have a 12:12 roof - Using ...
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T connection of two Beams To Support 2nd Floor - Post or No Post?
Context: We are building plans for an extension to our home, on three levels. We're working with a technologist and will be getting an engineer since they have to stamp any plans. We want to have a ...
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Moving a Crossbar in a barn style shed
I have a 12x20 workshop and it was shipped with this Crossbar that is in a very inconvenient spot.
+-----------------------+
! ! ! !
! ! ! !
! Loft. ...
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What is the optimal configuration of a cross brace on a wooden gate?
I'm building a wooden gate for my deck, and I want to put in a cross brace to reduce sagging. I want to install the brace so that it transfers the load from the top unhinged corner, to the bottom ...
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Framing a glass greenhouse
I would like to build a greenhouse using an existing steel frame structure that is already erected. It is 20L X 20W X 10H. I have many large sheets of 1/8" tempered glass to use for this. Will ...
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Do I need to plumb my walls?
I'm building a small room and I do not have the option of leveling the floor, which is currently at about a 1-2° slant parallel to the 14 ft walls and perpendicular to the 12 ft walls. The walls are ...
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Filling hole in limestone foundation wall with concrete
We have a garage built out of limestone bricks and sitting on a natural rock foundation. Recently, we dug our garage about 2 feet deeper by removing more of this rock. As a result, some of the rock ...
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Is My Load Bearing Beam Safe? [closed]
I have been getting work done on my kitchen which involved removing a load bearing wall. To make a long story short, the contractor is a liar and now I can’t trust him. It has been 2 months now of ...
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Freestanding Shelves Stability
I recently built this set of shelves for my basement. Because of the insulated walls I do not plan to anchor them.
The shelves are not as solid as I hoped. After doing some research, I think one main ...
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My new AC is under performing and guzzling too much juice, can anyone help?
My company mainly focuses on small refrigeration units and walk-ins. Although we do offer service and/or Replacements on air conditioning systems, it’s only 1/3rd of the whole show so, I’d be a liar ...
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Questions on structural eng drawing for egress window
I am installing an egress window in my basement to make it a legal bedroom. I am going to be doing most of the work myself (outside of cutting the concrete) but doing it by the book (permits, ...
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A constant vibration is happening in my home. Like a motor is running [closed]
I have 3 story single column load bearing house. Recently I made a room at the terrace. After the construction my house is vibrating all the time. My house is between 2 houses; there is no gap in them....
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Temp wall to support wide opening in exterior wall
I'm putting in an 11' wide door opening in a walkout basement exterior wall. There are 2 more floors above the basement. I have the engineered sized steel beam as the header.
Can I do a 2x6 temp wall, ...
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Floor joist notching - where is the middle third
I have a house with 24' 2x8 floor joists. At the center of the span, they rest on a perpendicular beam 44' long which is supported by steel posts. I need to run two 3/4" PEX heating lines through ...
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Working Load of 4x6 Pressure Treated
Adding a shed roof to my building that will have rafters 16" on center.
How can I find the working load of a 4x6 pressure treated beam that is supported by 4x4 posts 10' on center? I will also ...
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What size/type of window header beam do I need?
I'm looking for some help specifying the type and dimensions of a new window header. The biggest complicating issue is that I only have 7.25" of depth to use for the new header.
The goal is to ...
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Do I add live load plus snow load to dead load?
I'm building a 10x16 shed/dry cabin and I am trying to figure out how much weight my footings need to support. Do I need to add live load + dead load + snow load?
Live load is 30-50 psf based on ...
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Calculating correct size joist to support a column
Im working on some plans which will be checked by an engineer but would like to do a decent job to begin with and would like to educate myself more.
I have a loft with an LVL beam resting on a (4) 2x6 ...
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Are 2x6 joists adequate for a loft spanning 10 feet?
Planning to build a 10'x16' "cabin" with a loft. My idea is to use 2x4-10 for the walls then in the loft area use 2x4-8 for the walls and run 2x6-10 the width of the cabin to create the loft ...
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Steel beams for 22' interior clear span
I am building a ceiling under an existing roof, covering an area of 22' x 28'. This rectangle will be supported at the two ends of the 22' run, as well as, optionally, one or possibly two ends of the ...
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How much load can a 7' wooden 4x6 beam carry?
I'm planning a swing set for 4 children. I'm considering using a 4x6 beam (with the 6" dimension placed vertically) to support the swings over a span of about 15 feet with a center support. What ...
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Can mild steel square tubing 33x33mm Square with 2mm walls support a desk-top?
Here is the basic idea: An L-shaped computer desk mounted to the wall with no legs. (Screens will be mounted on the wall.)
This is the Mounting Bracket:
The length of the tube will be 22", ...
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Calculating the load limits of dimensional lumber and a custom beam
As I build things, how / where can I look up the approximate load values for a “beam” made of dimensional lumber?
E.g.
What is the max it can hold if it’s in a joist orientation (sideways with the ...
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What is the column strength of Steel Pipe?
I'm looking to compare how much weight a 4ft heigh column made of 1.5" steel pipe (1.9" OD, sch 40) hold vs a 2" pipe (sch 40, OD 2.375")
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Will ball casters sufficiently support a "bookcase-door" (hinged from a front corner)?
Followup to How do I know whether a bookcase will rack/sag/twist if hung using butt hinges as a (non-secret) "door"?
TL;DR:
I have a bookcase, want it to become a door, and load it with ...
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How do I know whether a bookcase will rack/sag/twist if hung using butt hinges as a (non-secret) "door"?
I want to take a bookcase and install it as a door, to hold near 100kg max of heavy food items (but probably less than that most of the time). The bookcase itself is 36kg.
The bookcase carcass and ...
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How can I find the centroid of a trapezoid with equal angles at the ends? [closed]
Trying to find the center of a trapezoid with beveled edges and there are 153 holes to be drilled. I know the easy way would have been to find it before I made the bevel cut but I wasn't thinking ...
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How can I better brace the walls of my timber building to avoid blocking window openings?
I'm rebuilding a wooden structure on a brick base, approx 5x3m footprint.
The main frame is built of 6x3" timber, to increase rigidity we have added corner braces in each direction, at the ends ...
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Will i compromise the structural integrity of my I-joist if i hang two 4×8 garage storage racks
I am looking to install two 4x8 overhead storage racks in my garage. Will I compromise the structural integrity of my i-joist, that is, 2"wide × 1 3/8"high × 3/4" to the web if I drill ...
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Can 2x6 ceiling joists support a temporary point source load of 1500#
I’m installing a residential elevator in my home. The installation requires a padeye in the ceiling to carry 1500 lbs. I have 2x6” ceiling joists spanning 16’. I planned to bridge a 2x10 across two ...
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Sufficient Concrete Thickness for Table?
I'm planning on making a Concrete patio table. My plan is to make a 6ft x 3ft Concrete top. The frame will be 4 legs. I will have 3 aluminum angles running vertically underneath the length of the ...
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How much weight can 14 gauge 3” square tubing support?
I’m trying to determine the load that will be subjected to a fence I want to build. The idea is that the posts of the fence will be constructed or 3x3-inch 14 gauge square tubing with stringers sized ...
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Need Cantilever requirement for Saucer Swing on swing set. If I use 12x4x6 can I have an angle support resulting in 3.5’ unsupported (8.5’ supported)?
Need help determining the appropriate length for cantilever on a swingset. Rough draft is below. All construction is 4x6. Looking to mount 12 foot beam on top of existing swingset beam. 5 feet ...
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Structural engineering? single family 2 story home with post tension cable slab concrete beams.1st FL bathrm to add new shower beam cut, add plumbing [closed]
Structural engineering question, working on a single family 2 story home with post tension cable slab with concrete beams in both directions. Working to add a new shower on a first floor bathroom that ...
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Why are basement walls subject to tensile forces?
I am teaching a mixture of English and Civil Engineering to a student, while not an Engineer.
One of our textbooks states:
Underground walls have to resist both tensile and compressive forces
...
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Do I need to supplement my floor joists or steel girder for a remodel?
I am doing a kitchen/den remodel and spoke to an engineer beforehand about taking out some walls (he said it's safe to do as they aren't load supporting). On his way out he said I should get someone ...
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Max span on 2x4 truss
I am refitting an old shop above my garage to be an ADU. It was built in the late 70s / early 80s, and the truss system is 2x4 trusses on 22" centers. The trusses are professionally built & ...
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How to create a permeable sound barrier? [closed]
I want to create a permeable (allowing things to pass through) sound barrier (noise barrier, soundwall, noise wall) for soundproofing purposes. It is for a room and specifically for the doorway/...
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Elegant way to jack two materials apart, applying spreading pressure to pin them in place?
I have a tall cabinet acting as a room divider. Since it's not against a wall, it could fall. Screwing into the floor or the wall is not feasible, but the top of the cabinet is 5 inches from a ...
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Load-Bearing Wall? Parallel to Joists, single story, but has attic supports [closed]
I've had multiple professionals look at this wall, and no one has been able to give me a clear answer (2 home inspectors, and 1 structural engineer). So I've come to the source of all truth, the ...
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Why is my main breaker tripping when I use a pool heater on a 50A breaker?
I have installed the 50 amp pool heater connected to the 50 amp GFCI breaker and is located outside. And I have connected to a 60 amp breaker at the panel. After a couple of seconds, when I turn on ...
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What Are the Percentage Markings on this Stormwater Management Drawing?
We purchased a house in Arlington Co, Virginia, and there is a "Micro-bioretention facility" in the middle of the backyard, making the back yard almost useless for enjoyment. In order to ...
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How can I calculate the load capacity of a platform?
I'm planning to build a very basic bed frame, but I'm not sure what size lumber to use.
I was thinking of building the entire thing from 2x4s (legs would be 4x4), but I'm not sure if this will be ...
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What is the cheapest way to stiffen a tube/pipe?
I have some steel tubes (18 mm OD) which I wish to use as horizontal members in a storage rack (a bit like shelves). However, the tube flex and bend quite a bit when I put heavier boxes on them. The ...
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Can I remove these walls?
I'm doing kitchen renovation and want to remove a few walls. Those are on the first floor of a 2 story house(no basement).
I've opened a few of them and did my best to provide all the pictures.
I ...
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