48 votes
Accepted

I want to build an all metal, self-designed building. Are metal frame and joists really that infeasible?

You're probably thinking of the wrong sort of metal When most people think of "metal buildings", they think of I-beams, columns, and open-web joists, as found in large-scale construction. ...
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28 votes

I want to build an all metal, self-designed building. Are metal frame and joists really that infeasible?

There are loads of pre-designed steel building shells out there. Use one. These are offered by commercial building companies for farm and industrial buildings. They have gotten a family of designs pre-...
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25 votes
Accepted

How do I stop a creek from eroding my steep embankment?

This is often a complex legal situation due to regulations that affect (in many parts of the world) what you can do in or near a body or stream of water even if the land next to it or around it ...
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23 votes

Will my wooden bridge withstand the weight of my small truck?

From conventional Hemlock Span tables it seems your 4x6s are only good for about 10' span at 40LBS live load. Your load is much higher when the trucks out in the middle of the bridge. I think this ...
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  • 2,265
21 votes

Will my wooden bridge withstand the weight of my small truck?

For a good answer you'd have to do the engineering calculations but maybe just do a sanity check before digging into that. You could think about this. A single 4x6 standing on edge is not that much ...
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16 votes

How do I stop a creek from eroding my steep embankment?

Legal issues aside (that's not our pigeon here), a reliable way is dry mix sand bagging:- Pick a low quality concrete sans water, place it at your leisure and let the rain /moisture make it go off. ...
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14 votes

How do I stop a creek from eroding my steep embankment?

As mentioned in another answer, there may be legal issues since the creek is a waterway. In the US, you would have Federal and probably state laws involved (many other countries have similar laws ...
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13 votes
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Repairing a notched floor joist

Good on you for leveling up your knowledge and learning where not to drill or saw on joists. On that same note, here's an excellent summary from BuildingAdvisor titled Guide to Notching and Boring ...
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13 votes

I want to build an all metal, self-designed building. Are metal frame and joists really that infeasible?

Background: My father was a structural engineer in the steel building industry and did exactly what you are asking for - calculate the statics of buildings and other large constructions, dimension ...
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  • 331
11 votes

I want to build an all metal, self-designed building. Are metal frame and joists really that infeasible?

Prefab metal shed. These are popular and durable. They are used on farms and workyards everywhere. Many, many sizes and shapes are available. Quonset huts many decades old are still in service. ...
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  • 5,628
9 votes

Why are basement walls subject to tensile forces?

All walls experience tensile stress. This is not a force trying to pull the wall apart as such. The stress comes from lateral forces that can arise from two sources. Firstly, a simple lateral force ...
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  • 1,294
9 votes

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

You need to ask your question to an actual structural engineer that can look at your structure design and give you professional guidance. This may very well require a consultation payment contract. ...
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8 votes

How do I stop a creek from eroding my steep embankment?

Been there , done that; my creek ( Plum Creek, Highland IN) was 30ft. width and embankment was 40 ft. high. I "coated" it with railroad ties, bricks, and many cuttings of trees and bushes. To reach my ...
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  • 7,786
7 votes

How do I stop a creek from eroding my steep embankment?

What I’ve seen commonly done is either large rocks or large chunks of concrete dumped to protect the area eroding. You say it is slow moving, so I’m betting the erosion primarily happens during/...
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7 votes

Will my wooden bridge withstand the weight of my small truck?

Note this answer is only based on basic engineering knowledge and not on experience in building bridges or using wood as structural elements. There are probably more things to consider using wood as ...
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  • 171
7 votes

Elegant way to jack two materials apart, applying spreading pressure to pin them in place?

Power Wedge with Wing Nut Build a power wedge from some wooden wedges, a bolt and a wing nut. It will be strong, simple to tighten, and seismically safe when the bottom wedge is fastened to the top of ...
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6 votes

How can I hang a 250 lb wooden piece of art on the wall?

What you described with the 45 degree bevel is called a french cleat. It's used for securing heavy items to walls and I've seen them used in upper kitchen cabinet installations. 1x6 hardwood cut in ...
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5 votes

Correct placement for 1,200 lb pizza oven on wooden box I built

It will be fine in terms of the weight... the 4x4s in the center will easily handle the load. I'm a bit concerned about the OSB though. Personally if it isn't too late I'd really suggest 3/4" CDX ...
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5 votes

Overkill from my Structural Engineer, can you check his drawings?

The structural engineer sized that as a W6x25 steel beam because he wanted it flush in the 2x8 floor system as it is only 6.38" deep. If you changed it to a LVL, you would need a 3 ply 11-7/8" LVL, ...
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  • 4,671
5 votes
Accepted

Steel beams for 22' interior clear span

Just a heads up, spanning 22' while being limited to 4-6" floor depth is extremely cost prohibitive. Deeper is always cheaper, but it sounds like you don't have the space to make this work as planned. ...
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  • 4,671
5 votes

Repairing a notched floor joist

These are larger than 2x6 joists. That plays in your favor. A notch in a 2x6 is disastrous. The beams look OK for now. The cracks are horizontal so they're not concerning. Those can be caused by the ...
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  • 20.6k
5 votes

Repairing a notched floor joist

You’re lucky, sort of... First, the joists are 1 5/8” x 7 1/2” not 1 1/2” x 7 1/4” if the house was built in the 1940’s. Second, the joists are not Redwood (thank goodness) they’re Douglas fir. ...
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4 votes

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?

Once you have corrected your axis of rotation it should be obvious that the idea to lengthen the "clip" will not change anything with regard to the force required to raise the flap. Actually it could ...
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  • 61.9k
4 votes

How can I hang a 250 lb wooden piece of art on the wall?

As @OrgnicLawnDIY suggests, use french cleats. These are 1x4 or 1x6 boards cut on a 45 degree angle. The lower section has the short side against the wall and the upper section, attached to the item ...
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4 votes

Fix sagging beam situation

If I'm reading this right(and looking at the final picture), the beam itself is sagging. It may have reached an equilibrium point, and simply jacking up an reattaching it will fix it. But you'll still ...
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4 votes

How should I go about removing these two walls?

Seeing as you're in the UK (lots of well-enforced building regulations) and you're wanting to remove at least one load-bearing wall (the old external wall), you absolutely need to bring in the pros ...
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4 votes

Overkill from my Structural Engineer, can you check his drawings?

Presumably you engaged this person for their professional expertise, so can you indicate why you feel you are qualified to override them? Or is your question based on aesthetics or practicality? If it ...
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4 votes
Accepted

Fix wobbly storage shelf

Most things we build are rectangular, and rectangular structures are prone to racking, which is illustrated in this drawing of a deck, but the same problem affects your rectangular shelves: As you ...
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4 votes

How do I stop a creek from eroding my steep embankment?

Adding to some already good answers, I'd emphasize using vegetation to help stabilize the bank. Only one answer (https://diy.stackexchange.com/a/162118/76258 - a great one) mentioned that so far. My ...
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  • 1,103
4 votes

Elegant way to jack two materials apart, applying spreading pressure to pin them in place?

I know you are thinking of using a turnbuckle on two threaded rods to push the beam and the cabinet, while it is doable but not reliable because the rod exerts a point load and the ends are similar to ...
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