jinbtown

jinbtown t1_j6gv0l7 wrote

atmospheric vented gas furnace? if so it's providing make up air for combustion, and yes, it's necessary. Without it you might suck exhaust and CO back into you home.

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jinbtown t1_j5ptvii wrote

You do not want those vents in a hot roof type attic. It's part of conditioned space and you aren't insulated between the "warm" attic and "hot" (relatively speaking) house. If it's part of the thermal envelope it should not be vented. The point of the spray foam is to provide an air and moisture barrier.

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jinbtown t1_j1nunhx wrote

Do not install the junction box in the same cabinet space as the dishwasher. Dishwashers can occasionally vent into their cabinets if the one way air equalization valve fails, and junction boxes are a notorious spot for electrical failures, smoke, and fires. You need to be able to get at it if something happens. Pulling your dishwasher out to get to it is not a good option. Mount it as high up as possible as well.

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jinbtown t1_ix1ulej wrote

that's what I would do. for fences they recommend 1/3 - 1/2 of the exposed height, and this is carrying a lot more weight than a fence! the weight being 8' off the ground means there's a lot of torque on those posts if the load gets off center. Make sure that 4x4 is sitting on a proper bell end too - you need uplift resistance since this has a roof and open sides, the wind can produce thousands and thousands of pounds of uplift force on the underside of the roofHave you considered a mobile gantry for lifting stuff? You could make the entire structure floating if you did that

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jinbtown t1_ix1low3 wrote

bolt to a plate on top of concrete column or footer.
the structure needs to be rigid to prevent racking or twisting, make sure your fourth wall that you pull into has some sort of shear protection

notch your 4x4's for the cross beam/rafter. the 4x4 will be fine for 1000 lbs per post, but that's a lot of weight for a dimensional lumber rafter, so make sure what you're using is strong enough for a point load of that much weight. Might want to use a knee brace or something to reduce the span

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