# How many bags of concret needed ?

2173 Views 15 Replies 7 Participants Last post by  DIY SC
I'm getting two 10x20 canopies each with 8 legs I want to weigh down using concrete filled cinder blocks.

So how many 60lb bags of concrete do I need to fill all the holes in 16 eight-inch cinder blocks ?

(total of 32 holes to fill)

Thanks !

Top
1 - 16 of 16 Posts
#1, There concrete blocks not "cinder blocks" unless your using blocks made in the 50's.
Without a better idea on what you mean by "canopies it's anyone's guess on how best to "hold them down".
Is this just for a single event are these going to be permanent?
Trying to figure out why you would be using concrete blocks instead of Sona Tubes.
1
if a hole is 4x4x8x32=4096 cubic inches

one cubic foot =1728 cu. in.

you need 2.37 cu ft.

one bag=.45

2.37/.45= 5.26 bags.

The holes will be bigger than 4" so you can do the math your self.
See less See more
1
#1, There concrete blocks not "cinder blocks" unless your using blocks made in the 50's.
Without a better idea on what you mean by "canopies it's anyone's guess on how best to "hold them down".
Is this just for a single event are these going to be permanent?
Trying to figure out why you would be using concrete blocks instead of Sona Tubes.
Hey, the local hardware understood cinder blocks :smile:

Each canopy is 10x20 and will be used to park our cars under to keep the hot sun off.

They will be placed on a concrete parking area, likely to stay in the same spot but wife wanted us to be able to move them to a different spot just in case we changed how we parked our cars.

The concrete blocks are being used as we were able to get them fairly cheap, I'm retired and on a budget.
Plug 1 hole with a balloon and fill it with a measured amount of water X 32 to get cubic inches then proceed.

EDIT: EDIT:
1
if a hole is 4x4x8x32=4096 cubic inches

one cubic foot =1728 cu. in.

you need 2.37 cu ft.

one bag=.45

2.37/.45= 5.26 bags.

The holes will be bigger than 4" so you can do the math your self.
Thanks, the holes are 5x5x8, I was asking because I had previously calculated it would take 9 60-lb bags using an online calculator and somehow 9 bags seemed like a lot to just fill 16 concrete blocks so I wanted to ask just to be sure.
Thanks, the holes are 5x5x8, I was asking because I had previously calculated it would take 9 60-lb bags using an online calculator and somehow 9 bags seemed like a lot to just fill 16 concrete blocks so I wanted to ask just to be sure.
At a guess 9 sounds about right.
2
At a guess 9 sounds about right.
Using your formula it said 8.2 bags, so 9 would give me a safety margin.

It just surprised me it would take that much and I wanted to be sure :smile:

Thanks again !
1
1
Thanks, looks nice, but we need the 10x20 and that one is 10x17

Also, we like having the sides open for easier access as the door on our car opens a little wider than where the wall would be.

We ordered these:

https://www.amazon.com/gp/product/B001G7Q1WC/ref=ppx_yo_dt_b_asin_title_o00_s00

We originally was going to get ones with only one leg in the center, but then we realized a center leg would be in the way of the door opening all the way, whereas with 2 legs on each side the door will open in between the 2 legs.

See less See more
Here's a few pics of the finished project:

See less See more
3
2
So you will need 8 people to move one?
So you will need 8 people to move one?
Only in Florida. Others move refrigerators by themselves every day.

EDIT: EDIT:
I would hate to see you in a hurricane.
Your canopy won't stand a much less storm than a hurricane.
Just go and talk to artists at local art and craft shows and pick their brains about flying canopies.
So you will need 8 people to move one?
It's very unlikely we'd ever want to move it.

I would hate to see you in a hurricane.
Your canopy won't stand a much less storm than a hurricane.
Just go and talk to artists at local art and craft shows and pick their brains about flying canopies.
It's likely about 300-350lbs of weight holding it down, I would think it'd take a really strong storm to move it, thankfully such storms are fairly rare in our local area, if a really strong storm was forecast then the solution would be to simply take the top cover off till the storm was over.

(I've tried moving those block ever so slightly to fine-tune them being lined up and it was VERY hard to move one block even an inch or two)

If I felt I needed to I could always use "L" brackets and concrete screws and fasten the concrete filled blocks to the concrete parking area.

We have another identical canopy elsewhere on our property we've had for many years and it's still fine, that one is fastened to posts in the ground.
2
Well. got a 2nd canopy up next to the 1st one, to me it actually looks even better having 2 matching canopies side by side, and the solar powered string lights really make it look neat at night !

See less See more
3
1
1 - 16 of 16 Posts