Questions tagged [engineering]
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64
questions
0
votes
2answers
75 views
Replacing ceiling joists with rafter ties higher up on the rafters
I'm trying to help my grandfather plan for a remodel of his 1950s home. The original structure is 24x24' with 6" rafters spaced about 20" apart on a 6/12 roof. He'd like to be able to have a "vaulted ...
2
votes
1answer
113 views
Is this wall load-bearing?
Want to remove wall (picture with x on wall) coming through kitchen horizontally (backside facing living room with photos on it). Would leave wall in place beside it. Removing would make a 15 ft walk ...
0
votes
1answer
109 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 ...
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/...
0
votes
0answers
60 views
Frame a jack stud without bottom plate?
I need to frame a small header in my kitchen exterior wall for a range hood exhaust because the 8" hole is dead center on a stud (of course). It's a 2 story 1941 house with 2x4s 16 on center.
The ...
0
votes
1answer
63 views
Simpson A-35 (framing angle) suitable for this application?
Would an A-35 be suitable for the rafter>top-plate connection shown here? Would I need one on both sides of a rafter, or just on one side? Existing structure (grey) is 12'x 18', 6" CMU block w/rebar, ...
0
votes
0answers
89 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 ...
0
votes
1answer
238 views
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 ...
0
votes
0answers
28 views
Which Installation position of expansion tank is more technical [duplicate]
If there is two expansion tank of the same volume(same diameter and height) ,which position of vertical or horizontal direction is technically better to be installed.
0
votes
1answer
363 views
How much weight/many people can my rooftop deck hold? 2“x12”x20' joists, 16“ on center, 2”x4" framing under [closed]
How much weight/ How many people can my rooftop deck hold?
The joists are 2"x12" over 20ft, 16" on center
The framing under the deck is typical 2"x4" framing (living space), on a concrete ...
1
vote
1answer
127 views
Could I move a piano ALONE this way?
To move a piano from a first floor to another first floor, using a pickup truck, it seems like a ramp, a strong rope and some pulleys, and a furniture dolly would suffice. Plus a basketball and pump (...
1
vote
2answers
1k views
A-frame swing set max length of 4x4 beams
I am building an a-frame swing set for my kids using a 4x6 and 4x4 beams. We are using pre-built brackets to attach everything.
What I am wondering is, is there a max length that the 4x4 can safely ...
1
vote
0answers
67 views
Fujitsu Halcyon: Custom Air-Filter (C.F.M.)
I'm trying to make airfilters to fit over my Fujitsu Halcyon Wall Mounted heating & air-conditioning split system. I'm talking about the indoor unit specifically. The wire mesh screens that come ...
32
votes
10answers
9k views
How do I stop a creek from eroding my steep embankment?
Behind my house there is a very steep bank/slope that leads down to a decent-sized, slow moving creek about 10 - 12 ft wide. Unfortunately it meanders right behind my property at the base of this ...
0
votes
0answers
76 views
DIY Pool Lift designs & successes?
My dad suddenly has serious mobility issues keeping him from his beloved pool. I’m visiting this week and trying to see if there’s some diy pool lift of any design I can build from stuff at Harbor ...
0
votes
1answer
633 views
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 ...
1
vote
2answers
1k views
Fix wobbly storage shelf
I just built this storage rack for my basement out of 2x4s and plywood. It is relatively stable but does have some front to back wobble. More than I would like. Is there a way to increase the ...
0
votes
1answer
44 views
Are there any join charts similar to span charts?
Are there any charts indicating what type of joints are stronger than others? For example, how would one determine which of the following joints is stronger? Intuitively I'd say longer cuts ...
0
votes
0answers
349 views
How to cantilever a roof beyond the end wall?
How can this roof be extended 16 inches beyond the end wall? Seems like it requires some 8 foot 2x4's but I'm unsure how to brace them to the truss. My way of thinking would put them above 4 inner ...
0
votes
1answer
20 views
Is there any advantage to using larger stones in a free-standing dry stack wall?
I'm building a free-standing dry stack wall using ashlar scrap from a quarry (pieces of uniform thickness with completely flat top and bottom faces, but irregular sides):
Within each course of the ...
0
votes
2answers
434 views
Is a 15 foot tall pergola not feasible?
Looking for some structural wisdom :)
I have a deck that sits 6 feet off the ground, and I want to build a pergola whose "roof" (beams/slats) are 9 feet above the deck. So, from ground (grass) to ...
0
votes
1answer
42 views
Goal: make hardwood slats for a bed thin to flex, w/o degradation
My goal is to make hardwood slats for a 4' wide bed, (center support, so span is 24"), thin enough so my heavier parts flex, adding comfort so I can minimize mattress. (Ideally, pad will be 1 inch ...
0
votes
0answers
408 views
Mid span weight capacity
What is the mid-span (center of wood board) load bearing capacity of one 2”x12”x10’ setting on edge. I will be mounting a 1 ton chain hoist by a 2”x36” tow hook strap rated up to 3,300 lbs dead load ...
1
vote
1answer
368 views
Calculating time constant for storage-tank water heater
I was curious what the R-C time constant is, for a conventional storage-tank style electric water heater; I came up with an answer that seems very counter-intuitive.
("RC time constant" is the ...
0
votes
1answer
97 views
dig out and finish my crawl space into a basement
I have a house with a continuous concrete stem wall, and a sill plate seismically bolted to the foundation. It's on a hillside, and the north (downslope) is post and pier (not continuous). There are ...
2
votes
2answers
724 views
Overkill from my Structural Engineer, can you check his drawings?
I have a cape I am moving the stairs and dormering the back. My engineer sent me these drawings. I think its overkill that he put HSS steel posts with w6x25(steel beam) across for the support. He has ...
1
vote
1answer
52 views
How do I determine what load values I need to use when using door/windows header sizing tables?
I'm designing the framing drawings for a building with window and door openings in a roof-bearing wall (no floors above) and I need to determine how thick my headers need to be. There are span tables ...
1
vote
4answers
10k views
Does shear strength increase with the number of fasteners?
Let's say I have screws with 1,000 lbs shear strength. If I add more screws, does the total shear strength of the joint increase? If I use 3 screws, then put a 2,000 lbs shear load on the joint, ...
1
vote
2answers
2k views
How are grade-level garage slabs typically connected to a basement wall?
When you have a basement wall that needs to join up to a garage slab at the top of the basement wall, how are the footings for the garage slab placed, and how does the garage slab attach to the ...
1
vote
1answer
318 views
Removing or replacing a post supporting a bolted joint in a long glue lam beam [closed]
We bought a home to remodel - and taking down a wall we found that our gluelam beam is actually two different beams, held together with some steel and bolts, and supported by a 4x6 vertical timber. We ...
1
vote
2answers
111 views
What kind of connector is this and where do I find it?
I recently bought some electric solenoid valves online, and I don't know what kind of electrical connector this is using, and where to get a female version.
Does anyone know where I can find the ...
2
votes
2answers
977 views
Does beam orientation matter for structural engineering calculation values from wood supplier tables?
One can get values for load bearing of simple wood constructions and thus the right beam profile dimensions to choose from tables from wood supplies (e.g. http://www.merkleholz.de/en/Static-table-KVH-...
0
votes
2answers
2k views
Cantilevered roof overhangs
Are there good options for attaching roof eaves/overhangs essentially as cantilevered beams with a fixed support? This is a monoslope (lean-to) roof with a 2:12 pitch (~9.46 deg), unheated structure, ...
1
vote
1answer
312 views
How deep should piers be for a concrete block fence wall?
I am wanting to put up a 1.8m high (besser/cinder) block wall that spans 10 meters across our rear boundary. The wall will be tied to both other neighbours walls also.
The council water main runs 1.3 ...
0
votes
0answers
84 views
How do I make my floating shelf stronger/less susceptible to vibrations?
I'm building an entertainment center. I plan to put a turntable on the middle shelf in the picture below. There will be a floor standing speaker directly below the shelf. I expect the bass from the ...
1
vote
1answer
135 views
Correct placement for 1,200 lb pizza oven on wooden box I built
I am not much of a DIY-er, but I decided I wanted to try and make a stand for a 1,200 lb pizza oven I wanted to buy. I built a box out of 4x4's, and wrapped it in 5/8" OSB.
The dimensions of the ...
0
votes
0answers
517 views
Permanent greenhouse structure materials
I'm planning a permanent greenhouse structure that will be attached on one wall to my house. The estimated size will be about 16ft wide, 45ft long, with the lowest wall being approximately 9ft tall ...
1
vote
1answer
5k views
Replace load bearing studs with 4x4 posts
I would like to open up our dining room to our living room, but don't want to install an LVL due to a limited budget.
We decided to get creative. By simply removing the sheetrock, and using the ...
1
vote
1answer
1k views
Glass thickness for plywood tank
Apologies if this question is misplaced. I'm needing to know the required thickness of a glass viewing window when installed in a large plywood/steel constructed aquaculture tank (for a home / DIY ...
1
vote
0answers
108 views
North Carolina Code question for splicing 6x6 posts
I have a 48 X 10 second floor deck with 6X6 posts. I want to add a roof above about half of it. It is not feasible to replace the 6X6's with longer ones as I would basically end up replacing the ...
1
vote
1answer
169 views
How should I go about removing these two walls?
We just bought our first house, so go easy on me as I’m not an experienced DIY’er. I have read the documentation available on planningportal.gov.uk, but am still very confused.
We’re hoping to remove ...
1
vote
1answer
738 views
Furniture calculations
I make camp furniture. I have been using pine for quite some time, but would like to shift to hardwoods. My questions is thus: How do I determine the equivalent strengths between 2 boards? For ...
3
votes
4answers
15k views
How to calculate steel beam and posts size to replace existing wood beam in terrace
I have a covered terrace that extends 10' out (West) from the house towards the yard/pool and has a width/span of 32'.
The current beam is made up of (2) 2x6 in wood placed side-by-side functioning ...
1
vote
3answers
2k views
Fix sagging beam situation
We've got a beam that we replaced two years ago due to some damage. The beam is out front and is above all the other beams it supports, which makes the whole thing a bit strange. We made our own ...
1
vote
0answers
53 views
Calculating Tie Plate loading and double shear
I am considering the use of L strap ties from Strong Tie. I will be connecting two 4x4's in an L-configuration. The image at the very bottom-right corner of the below PDF illustrates exactly the ...
4
votes
4answers
10k views
How can I hang a 250 lb wooden piece of art on the wall?
I have 3x8 Brazilian Cherry timbers cut with tongue and groove that stack on top of each other to make a very large wooden piece of art to hang on my wall. I have all of the pieces glued to each other ...
3
votes
2answers
5k views
How can I calculate the rotational force and motor HP needed to lift a 5lb sheet from a horizontal position to a vertical position from one end?
Essentially, I need to know the following:
How do I calculate the rotation force along a fulcrum? Is there an equation?
What is the weight of a 5 lb object at the fulcrum if the fulcrum is located at ...
1
vote
1answer
173 views
Weight distribution on library ladder?
I have a very tall galkey kitchen, with cabinets run to the ceiling. A library ladder would be an ideal way to utilize this space. I have the skills necessary to fabrcate what I need, but I don't know ...
2
votes
1answer
2k views
How would I replace 4 posts and beam holding my covered patio with 2 posts?
I have a covered patio that extends 10' from the house towards the yard/pool and has a width of 30-33'. The covered patio seems to be part of the roof, I even have access from the attic as we ran some ...
13
votes
7answers
65k views
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 ...
