Attachment shed build underway

[bdog]

I finally got around to getting started on my attachment shed. It is going to be an all steel three sided structure. It is 100' wide, 15' deep, 8' high clear span in the front and 7' high clear span in the back. Actually 8'8" and 7'8" unless you are under a rafter.

We dug 18" diameter holes 5.5' deep for the columns. We cut 2' long pieces of 18" sonotube and stuffed it in the top of the holes to bring them up to grade. Where the shed is slopes approximately 1' in the 100' direction and I didn't want to go to the trouble of leveling it. I just used the sonotubes to being up the base on the low end and as an added bonus will have a slightly higher shed on that end.




It took 5 yards of concrete to fill them all up. We called in a truck. It would have took 228 80lb bags to mix by hand. We have a mixer for the skid steer but wanted to save our backs.



While the concrete is drying we welded all the columns and rafters together. The first took a while to get square but after that we just stacked them and used the first as a template. With them stacked perfectly aligned we drew lines where all the purlin clips go so they can be welded on in the shop and we are sure they are straight.



I think the welds will hold.



Tomorrow we plan to finish welding the purlin clips on an erect the columns. Maybe even start welding the purlins on if time allows. The concrete will have only had about 48 hours to cure but each column assembly only weighs 300 lbs. The piers should be plenty sturdy to hold 150 lbs each.

 

[Luke'sScreenName]

That's going to be awesome! So nice to use.

I'm ignorant to this kind of thing but when the shed is 3 sided and long like yours, do you have to worry about wind more. Like updrafts?

 

[bdog]

I am sure you do. It opens to the south and most are bad winds are from the north or west. I also went 5.5’ deep on the posts and each of the ten posts has approximately 2000lb of concrete in it. The wind is strong but I doubt it is lifting 20,000 lbs.

Things set in the ground in concrete bind in there a heck of a lot harder than than just the weight of it. I had to pull about 12 pipe fence posts set in 3’ foot of concrete with two 80 lb bags where the shed is prior to building it. My skid steer can lift around 6,000 lbs and it wouldn’t pull out some of these posts without first pushing them back and forth and side to side.

 

[GLyford]

That looks like it is going to be an awesome structure, I'm envious!

 

[prichard]

Looks like you're off to a great start. Nice job on the welds.

 

[bdog]

Thanks guys. Made a little more progress today.

 

[Xfaxman]

What size and shape is in the concrete that you welded the columns too?

 

[bdog]

What size and shape is in the concrete that you welded the columns too?

It is 18" diameter and about 5.5-6' long - cylindrical.


I made a little more progress today. Welded all the roof purlins on and did half of the sidewall grits.

 

[Xfaxman]

I wasn't clear enough with my question. I was asking about the metal in the concrete?

 

[bdog]

Oh sorry I misread it. The plates are 3/8” thick and 6”x 10”. Each plate came with 6 studs maybe 1/2” in diameter welded on a foot long each with the ends bent at a 90. I bought them at the steel yard for $15 a piece. I welded two pieces of rebar about 4’ long each to the bottom of the plates to go down into the concrete in addition to what was already there.

If I had it to do over I would have used 8x12 plates. My columns have a 4x8 footprint so with a 6x10 plate you have to have the plate embedded within an inch in each direction for it to work which is kinda tricky to do.