Francesca @ FuoriBorgo
This past week, we've been busy doing some necessary maintenance around our ancient house, which includes giving a fresh coat of paint to the walls and ceilings (here). Some of our walls are colored, and for those I buy eco-friendly paints, which are pricey but something we don't skimp on, for our family and the environment alike. For our ceilings and white walls, instead, we use lime, which is natural and solvent-free, and inexpensive. Also, lime is particularly suited to the thick, centuries-old stone walls of our farmhouse (but it also works on timber and brick). The walls are built of stone, sand, clay and water, and soak up lots of humidity in the cold season; thanks to its porousness and anti-bacterial properties, lime tends to prevent the formation of mold. All this almost for free.
For the ceilings, we use lime putty, which is the easiest lime preparation to handle for painting: I dilute it with water and then apply with a brush. For walls, instead, we make our own inexpensive lime wash: I get a couple of kilos of slaked lime at the building supply store (which the shop clerks usually scoop out of 25 kilo bags and just give me for free), slowly mix it with water, let it sit overnight, and apply the next day. Over a day or two, the lime wash cures to a hard, opaque white layer with a rough texture that I personally really like.
So this is how we use lime and make lime wash. However, I did a little research on lime washing, and found differing opinions on the subject, especially as to whether additives (salt and glue) should be added to the mixture to make it more durable, and whether it's suitable for interiors. Should you want to give lime wash a try, you might read up on it first. Here are some starting points:
All you need to know about lime wash - points out to the importance of using good-quality lime wash and a suitable substrate.
Fias Co Farm white wash recipe - has some safety warnings about handling lime, and is of the opinion that lime wash should not be used for interiors (which is contrary to our experience - see above for information about properly preparing and applying lime wash)
Have you ever used lime on your interior walls?