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Thanks for the link PP. It’s an old article but still relevant, and exactly what I was looking for. I was impressed to read that when sealed hollow sections were cut open for inspection, after such long periods of time (more than 50 years in some cases), that the internal surface often showed...

As engineers, does this issue concern you? When you look up to exposed trusses in a new shopping centre mall or the spans in a multi-lane bridge that you’ve had a hand in building or designing, do you wonder how much corrosion is occurring on the inside of those enclosed structures? And...

I fancy that if a tiny animal can go in then it can leave at its leisure. Though, aren't we referring to holes maybe 2-3mm in diameter? Insects might make a nest inside.

My original post hoped to elicit your experiences in civil engineering. My interest was academic only. The images were picked up from the web in a random search. I think they're beautiful. Do you think they might have, or if you had designed them, would they have included drain holes to allow...

It's quite a skill to weld 1 mm thicknesses. I had some experience many many years ago, and recall vividly of allowing the flame to overheat the metal and have it explode in a spray of hot metal in the workbay, leaving a hole where I needed a weld.

Hi LittleWheels, I doubt there would be any blowout of metal unless very thin stock was involved. Heavy stock would likely be able to resist the effect of higher air pressure on the inside, and as the material cools the effect would be reversed. There may be a negative air pressure on the...

There are many tubular steel structures in the world. Circular, square, rectangular. Combinations of all three. Many of these structures are capped at the ends by welding a plate in place. It's commonly done. Aesthetics is one of the reasons. Another being to protect the internal surfaces from...

Yeah! [bigsmile] I expect (most) others would have it demolished and start again. Way too expensive. You're quite correct - backyard handyman. The roof will be removed and replaced. It'll be over-engineered. I have trade training in welding, which will help. Thanks for your comments. Very welcome.

The floor leveler begins to set within about 10 minutes. That can be useful but can also be a disadvantage. There will no doubt be a degree of fiddling with each post pair in getting them vertical and ensuring the truss is level. This will take time. I was planning on having all posts and...

The photo of an actual shed post is a little dark. It was the best I could do, but it does provide perspective. Note that there is no concrete floor, as yet. The next image is a copy of the photo. The existing post is bolted to a plate that extends from the footing. The C-section is not in...

Not quite. I'll try and show a sketch. With Easter around the corner, I'll post something next week.

"standard practice" Really, I didn't realise that. I have to admit that I was stuck for a solution. Then came up with the floor lever notion. It was my own idea. It seemed a good solution to me, but subsequently wondered, not having an engineering background, that maybe I was in cloud cuckoo...

I have a damaged steel shed. The roof has collapsed. Construction was with C-section steel that’s commonly used in shed structures. The walls remain standing and are in good condition. My intention is to reinforce the existing posts using SHS fitted inside the existing C-section posts (sealed on...