Bigfornoreas0n OP t1_ix1n0nk wrote
Reply to comment by jinbtown in Setting 4x4 posts in footer or on top, ‘joists’ on top of 4x4 with a bracket or through bolted to the side? by Bigfornoreas0n
I think knee braces will be a great idea and cheap insurance. I was planning on there being no walls, open air structure which is why I was thinking of setting the posts in footers to help stop racking.
jinbtown t1_ix1p6m9 wrote
totally, and knee braces will help stiffen it! Personally would want more than 2' of concrete setting depending on how high you're going. if you're going 8' up I'd want 4' in the ground
Bigfornoreas0n OP t1_ix1qdp1 wrote
I was going to go 8 if sitting on top of footer or use 10’ and have 2.5-3’ in concrete. Should I up those to 12’ and burry more?
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
dominus_aranearum t1_ix23b98 wrote
> for fences they recommend 1/3 - 1/2 of the exposed height
Fences aren't carrying a vertical load so the recommended burying distance is irrelevant in this case. Fences need to withstand wind forces perpendicular to the posts, hence the below ground support. For uplift, the structure needs a proper footing and brackets.
jinbtown t1_ix271xp wrote
Lateral stability is extremely important for posts carrying a gantry. Gantries have 4 feet forming a triangle for this exact reason! You're totally right about uplift which is v important for open structures
dominus_aranearum t1_ix27cex wrote
I misread what you wrote. My ADHD meds have worn off for the day and my reading comprehension has apparently been compromised.
jinbtown t1_ix27py0 wrote
ugh i feel like an ass, my apologies. edited my comment. thanks for chiming in
dominus_aranearum t1_ix2eq0b wrote
No need, I didn't take it personally. I'm one of those seemingly rare people up here that prefers to be corrected if I'm wrong. I'd rather learn something new than get offended. Have a great night!
Bigfornoreas0n OP t1_ix1vafi wrote
I did consider it gantry with a metal structure. I think I could nearly build this for the price of just a mobile gantry. And I really need to put as much money into my equipment as possible. I’m budgeting this before buying the equipment to make sure it’s feasible.
jinbtown t1_ix278a4 wrote
I pretty regularly see mobile gantries for sale with huge capacities for under $1000 on FB marketplace, maybe try checking there
Bigfornoreas0n OP t1_ix1w23n wrote
The new equipment to setup everything in my truck bed will be around 6000, if I start getting up towards 2-3k for this project then I’ll just buy an enclosed trailer and be done with it. I’d prefer to have the truck bed setup overall, especially if I can make it work and save a few thousand.
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