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    How to deal with fall protection on a 16 foot high roof?

    4/12 is nothing to be concerned about. Get the right footwear, don't work while distracted, and you'll be fine. Pay attention to the weather and time of day. Start late and quit early. It takes a very small amount of dew to turn that roof into a teflon coated ice skating rink.
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    Garage ceiling mounted box rail - add a stud in between or direct to ceiling?

    Are these doors are being installed inside where there is a solid floor? If you put wheels on the bottom all of the weight can be removed from the box rails so all they need to do is serve as guide rails.
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    Hoist from ceiling truss - what do you think?

    We don't have the plans for your trusses, but a truss of that type in that application would typically be engineered to support a 5 pound per square foot dead load from the bottom chord. From your attic picture you appear to have 24" spacing, so that works out to 10 pounds of dead load per...
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    Garage shelves using 2x4 as brackets

    If I understand your plan, you want to mount the 2x4 horizontally directly to the vertical with pocket screws like a **** joint? The pull out on those pocket screws won't come close to the shear in Mathias's original design. If you are storing packing peanuts it won't matter. If you have...
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    Welds

    I do see progress, but you need more practice. As others mentioned, not hot enough or moving too fast. The attempts on the left also look like they could have been hampered by a bad connection between the ground and workpiece or the mig gun itself to the machine. Grind flat, try again. Rinse...
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    Attaching an eye bolt to ceiling for hoist

    The actual weight isn't the problem. Those site-built trusses were not designed to support a point load from the bottom chord. Do not drill holes in the bottom chord for lags. If you ran a solid steel strap over the top and used it for your mounting, that would "probably" be fine for your 300lb...
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    How would you handle this drainage problem?

    The first thing I would do is figure out what is actually happening. You have evidence that dirt is moving, but no evidence of how this occurring. You suspect water erosion. Some smoke and a fan can be a big help in determining if there is any connection between those two holes. If you asked...
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    Older kitchen sink venting plumbing

    If you can figure out why you have so many lines you would be well on your way to consolidating them. For future reference, your existing drains are hubless cast iron. Generally good for a solid 100 year service life.
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    How to fix or replace leaky metal roof?

    You'll never get that water tight. You could remove what's there, add horizontal 2x4s on the flat, and then install new metal, but that will leave you with a gap between the existing cladding and new roof around the entire structure. The creative shed owner would delight in this new ventilation...
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    Wash Bay Setup

    You're planning to use a pressure washer inside your garage with a 75" TV, 2 EV chargers, air compressor, blower, vacuum, and likely a few other things that all require electricity?
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