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40 pounds compost = ?? cubic feet

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40 pounds compost = ?? cubic feet

Post  rob.emenaker on 3/5/2010, 1:13 pm

All of the compost I find is in 40 lb. bags and doesn't indicate how many cubic feet they are. I am not even sure how you can convert it properly since one is a measurement of weight and the other is a measurement of volume. Does anyone have a clue as to how much volume one of these 40 lb. bags of compost occupies?

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Re: 40 pounds compost = ?? cubic feet

Post  happyfrog on 3/5/2010, 1:40 pm

that's about 1 cu foot . that's the size bag i found last year.

hth!

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Re: 40 pounds compost = ?? cubic feet

Post  boffer on 3/5/2010, 2:10 pm

Interesting, I've only seen compost sold by volume, not weight. If a product isn't expandable like peat moss, a heaping 5 gallon bucket is a cubic foot. If you can visualize that, it will get you close.

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Re: 40 pounds compost = ?? cubic feet

Post  rob.emenaker on 3/5/2010, 2:29 pm

Thanks that helps a lot. From my reading and a post I found on the forums I am going to shoot for 10 cubic feet per 4'x4' box to account for settling.

Couple of more questions... First, is the material in commercial bags of peat moss and compost debris-free enough to just use without sifting, or do you find it's still a good practice? Second, do you add 3" to each each board length (51" instead of 48") to account for the thickness of the boards themselves?...perhaps even more since the lattice used to make up the grid takes up some of that space as well?

My OCD is getting the best of me here I know Wink

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Re: 40 pounds compost = ?? cubic feet

Post  timwardell on 3/5/2010, 2:40 pm

rob.emenaker wrote:Thanks that helps a lot. From my reading and a post I found on the forums I am going to shoot for 10 cubic feet per 4'x4' box to account for settling.

Couple of more questions... First, is the material in commercial bags of peat moss and compost debris-free enough to just use without sifting, or do you find it's still a good practice? Second, do you add 3" to each each board length (51" instead of 48") to account for the thickness of the boards themselves?...perhaps even more since the lattice used to make up the grid takes up some of that space as well?

My OCD is getting the best of me here I know Wink

Rob,
I've never found it necessary to sift store-bought peat moss or compost. Just put it your raised beds and don't worry about it. Nature will soon handle any larger than average pieces. :-) As for adding three inches to your measurements, you're really splitting hairs IMHO. The ratios are rules of thumb and don't have to be exact to three decimal points. As Mel says, "You're not baking a cake." :-)
Best of luck.

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Rob

Post  boffer on 3/5/2010, 3:12 pm

Like Tim says, the little stuff doesn't matter. But I've purchased chicken compost by the bag that had chicken bones in it! I could identify a leg and thigh bone-I suggest removing those!

Mel himself states that 'close' is good enough. Give or take a little just doesn't matter in any part of SFG.

Most folks' 4x4 boxes end up being 48 inches on the outside because that's what you can get out of an 8 foot board. No reason to buy a 10 footer and have a foot and a half left over.

Very few of my boxes are the same size because I use whatever I have around when it's time to build a box.

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Re: 40 pounds compost = ?? cubic feet

Post  Jeff Buffington on 3/5/2010, 9:36 pm

I picked up 4 - 40lb bags myself... and not a hide-nor-hair mention of how many cubic feet the bag contained. Whereas the peat most clearly stated the cubic footage, as did the vermiculite.

I have some compost that's been going since last spring... but I need to sift it to keep the bigger stuff out, so that's why I got the bags.. so supplement my own compost (multiple sources, right?) Not sure if I got enough vermiculite to start, however, I only picked up one bag.. and am planning on starting with two 4'x8' (x6") boxes.

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Re: 40 pounds compost = ?? cubic feet

Post  boffer on 3/5/2010, 9:46 pm

Multiple composts is a very good thing-no need to worry about ph and all that other stuff.

A 4x8 box is going to take 6ish cubic feet. Mel's mix can seem expensive when starting, but it's a lifetime investment-cheap in the long run.

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Re: 40 pounds compost = ?? cubic feet

Post  rds1955 on 3/5/2010, 10:33 pm

Here's an online Cubic Volume Calculator...
just type in the length x's the Width x's the depth...

Cubic Volume Calculator

A 6 inch deep SFG bed would be 0.50 ft.
A 8 inch deep SFG bed would be 0.75 ft.
A 10 inch deep SFG bed would be 0.875 ft.
and so on and so on....


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Re: 40 pounds compost = ?? cubic feet

Post  Jeff Buffington on 3/5/2010, 11:28 pm

boffer wrote:Multiple composts is a very good thing-no need to worry about ph and all that other stuff.

A 4x8 box is going to take 6ish cubic feet. Mel's mix can seem expensive when starting, but it's a lifetime investment-cheap in the long run.

That's what I was figuring... almost shelled out the money for the Black Kow... but, decided a mix between my own compost and the cow manure compost should be a decent blend. I also picked up some 1/4" mesh (3'x36') do make a sifter with so I can keep the less composted material out. Of course, I haven't mowed the lawn since December, so...few additions in the past few months, but I started to add some leftover vegetable matter to the mix in the past couple of weeks.

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Re: 40 pounds compost = ?? cubic feet

Post  rob.emenaker on 3/8/2010, 9:08 am

I found out this weekend that the sifter is going to be required. I found a lot of matter that was not composted (sticks and a few pebbles) in my final mix. Good thing is I have several weeks until I put anything in the boxes yet so I have time to build a sifter and top everything off. Can't wait to get my own compost going!

Oh and check out my new blog for my SFG travels. I will be updating regularly with pics, things I have learned, and going-ons. There is an RSS feed at the top too so you can subscribe with Google Reader or whatever you use for feeds. Comments are welcome...

robssfg.com

Thanks...
Rob Emenaker

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Re: 40 pounds compost = ?? cubic feet

Post  Lavender Debs on 3/8/2010, 9:22 am

Link please Rob!

Happy Frog (Betty Ann) has a sweet garden blog you might want to look at too.

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Re: 40 pounds compost = ?? cubic feet

Post  rob.emenaker on 3/8/2010, 9:29 am

It didn't make a link did it. Let me retry...

http://robssfg.com

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Re: 40 pounds compost = ?? cubic feet

Post  Lavender Debs on 3/8/2010, 9:40 am

Wow, that is some coldframe!

I've been doing my SFG blogging in the Pacific Northwest regional forum....But yours is way kewl!

Thanks

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Re: 40 pounds compost = ?? cubic feet

Post  rob.emenaker on 3/8/2010, 9:43 am

Yeah that was not a cheap cold frame, but it's huge and really well built. Juwel 1000 I think is the brand and model. Trying to get off on the best foot I can Smile

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Re: 40 pounds compost = ?? cubic feet

Post  Jeff Buffington on 3/9/2010, 11:42 pm

boffer wrote:Multiple composts is a very good thing-no need to worry about ph and all that other stuff.

A 4x8 box is going to take 6ish cubic feet. Mel's mix can seem expensive when starting, but it's a lifetime investment-cheap in the long run.

Indeed. I'm wondering now if I used too little compost or peat moss. I picked up a second bag of Vermiculite and mixed up what I had. I only had enough to fill one 4x8, and put down a small layer in my second 4x8 box (mostly to keep the weed fabric down.)

I used 2 bags of vermiculite, 4 bags of store bought compost, some of my own compost (maybe a bag worth), and 1 bale of peat moss. The vermiculite were 4cu/ft bags, the store bought compost were 40lb bags, and the compost was 3.0 cu/ft compressed, the largest my Home Depot carried. Again, no mention of actual volume, though the four were roughly the size of the compressed peat bale.

I had expected to fill one 4x8 and half of another... is it the extra area gained with the 4x8 vs the 4x4 boards?

So, should I just run with the full 4x8 and create another batch to fill up the second box, even the two out and add more compost to both boxes, or something else?

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