Double-Decker Drum Composter

Step 5: The barrels

Once the frame was ready, I began working on the barrels which are made from 55 gallon drums.

I decided to use blue since they get warm and will heat the compost inside. The barrels need to be a dark color since light colors will reflect the sun and heat is important when composting.

Using a 2 inch hole saw, I cut holes exactly in the center of the bottom and top of the barrels. This is what the pole will go through.

Then, using a rotary saw, I cut a rectangular door into each barrel. Take care that the door is big enough to allow comfortable access to the inside of the barrel.

After that, I used a drill to drill several hundred holes all over the barrels to allow for air to circulate inside the barrel. Air is also important when composting.

Comments

[leander37]

The number of holes seems excessive IMHO. I would be worried about compost drying out. When I build this, I'd think about cutting the number of holes in half. Any thoughts?

[iPodGuy]

Definitely go with less. You can always drill more later if the compost is not breaking down properly.

Half of them clog anyway.

[undrline]

I guess that answers my question about the top one dripping on the bottom one.

[0087adam]

would it be a good idea to paint the inside white, since white reflects light and heat, and the outside black so it absorbs it but keeps it inside?

[iPodGuy]

I'd say no. The paint may chip off and get into your compost. I think a black outside would be the most beneficial.

[SeaMonkey31]

My coworkers and I are starting a "depression" garden, and would like to make a composter. My question is where did you get the barrels that you used?

[kcfarmer]

Check Craig's List online. I found there or four sources for barrels there. Make sure you check to see what the contents were originally. Pretty much anything that says Ortho would be a no-no. The one I bought recenty for $20 had strawberry/kiwi juice. mmmmm nice smell!!

[iPodGuy]

I get mine at work.

[metallives]

I have no idea where to start looking or asking for barrels - any tips?

[iPodGuy]

There are a lot of tips in the comments section of this instructable. I get them from work because we buy our chemicals in bulk. Maybe speak to the maintenance department of a school, hospital or other type of building that might do the same.

[bosenbaugh]

I love this design and have decided to copy it exactly. Have you been pleased with it? Any problems or things you would change?

[iPodGuy]

I've been incredibly pleased with it. The only thing I have changed so far was to spraypaint the barrels flat black with that Krylon Fusion paint. Otherwise, it's working well. If you wind up building it, post a photo if you can. I love it when people duplicate or adapt my design!

[EDDoc61]

Great job with those vent holes. That's one steady drilling hand!