When we moved into our house years ago, we had no idea that we had a root cellar. From our point of view, we had a wet, nasty closet area off our foundation that needed to be cleaned up and made to stop leaking. Needless to say, as we came to understand the value of root cellars and what they were, we were glad that we had not been able to make a significant change to our root cellar since moving in.
We were able to put an insulated door on the root cellar, paint it, run electricity to it, and build shelves turning it into a great place to store our potatoes, sweet potatoes, homemade wine, canned goods, etc.
A good root cellar has a few components – good insulation, high humidity, and good ventilation. We had plenty of humidity, plenty of insulation (the ground) but no ventilation. We fixed that by adding vents. This was easily done by drilling holes in the foundation (through the cement block) and running 1 1/2″ PVC pipe through the side, then up through the flower beds outside. We used a bend at the top to keep out rain and a screen on each one to keep the critters out.
The way this works, the supply vent should bring cold air (when it sinks) down the pipe and into the root cellar. The source pipe goes nearly to the floor and the vent pipe on the adjacent wall has a vent at the top, to let the rising hot air escape. We decided to give it a little assistance by adding a powered fan to the vent. This was done using a few PVC fittings from Lowes and carving out a spot for an old computer exhaust fan wired to a 12v DC cordless phone power cord. We then plugged it into a timer like this to have it come on at the cooler parts of the day to cool off the root cellar and keep the fresh air moving through.
Lastly, we added shelves made from furring strips. This was a cheap alternative to purchasing shelves and allowed us to make custom-fit shelves for the root cellar. It took just under four bundles of furring strips (10 to a bundle) to finish – so for about $40, we were able to build simple shelves that would allow the air to circulate through the shelved items.
We plan on covering the nasty floor that is currently there with some small gravel. This will allow us to spray water on the floor that will then evaporate to maintain the humidity at or around the 95% humidity that root cellars need.
If you don’t have a root cellar, they’re easy to make in many homes. Just find a non-heated section of your basement (preferably with no window), wall it off with well-insulated walls and a door and vent it. Most people tend to aim for an ideal temperature in the mid 50’s. This keeps things like apples, potatoes, onions and garlic, sweet potatoes, etc. good for just about the entire winter.
In our case, this allows us an energy-free (mostly – when the fan isn’t running) means of preserving the freshness of our summer harvest. If you don’t yet have a root cellar but enjoy growing your own produce – consider a root cellar as your next DIY project!