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Lime Wash

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Lime is a natural substance. But it is caustic and can cause burns, so make sure you are properly protected before using or slaking it. The health and safety guide for lime is here.
How to use lime safely

Lime Wash: How and Why to Make it.

Earth plaster is beautiful. It has a warm, rustic texture that's soothing to the eye and pleasing to touch. I loved my grainy brown walls, and so did most other people, and I hummed and hawed about coating them in a lime wash. In the end I did. Why?

A lime wash is like the icing on your mud house cake. It holds the crumbs of sand on the wall, seals the plaster and keeps the bugs out. While I adored the rough mud texture of bare earth plaster, after a year I noticed issues. None of them were major. But here are the four reasons why I lime-washed.

1. Light. Earth plaster is rough and ready. It's the Hugh Jackman of the plaster world. But it has a dark side (don't they all). While I love cosy, warm caves, I also crave light. Earth plaster tends toward the dingy.

2. Dust. Without the lime wash, earth plaster alone creates an incredible amount of dust. I diligently swept my house every morning and never seemed to make significant inroads into the dust deposits. Window sills, door edges and alcoves were a devil to keep clean.

3. Insects. Lime is an insecticide, and I noticed as soon as I coated my walls in a lime wash that the amount of bugs in my home reduced drastically.

4. Repairing earth plaster is far more labour-intensive than simply whitewashing with lime. It requires another round of stomping of the mud, more mess in application and a longer drying time. No matter what you put on the walls, you need to maintain them. Lime is faster and easier for sure.

How to Make Lime Wash

Make sure you are dressed appropriately to protect yourself. Put a pint or two of lime putty in a bucket. Add casein (you can buy it as a powder or make your own from milk) or wheatpaste (about one part to 5 parts lime putty). Then slowly add water and stir (or whisk) until you've created a smooth, thinnish white paint.


Note: You need a binder like wheatpaste or casein to help seal the limewash, otherwise your whitewash may remain dusty, and can leave marks on clothes. If you can source good quality mature lime putty, a binder may not be necessary.

ANOTHER TRICK!
You can also add skimmed milk to the lime putty instead of casein powder to create an amazingly hard, protective finish. The casein in the milk reacts with the lime to form a strong, dust-free shell. 

COLOUR
I wanted to avoid the traditional whitewash look and hoped to create a more wheaty colour. We tried out various natural home-made colours including turmeric, cinnamon and tea. Strong Turkish tea seemed to work the best. You can of course also buy natural paints to add to your lime. Just note that lime always whitens as it dries, so your finished colour will be far paler.

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Three Reasons You Might Not Want a Lime Wash

Do I regret liming? No, but it's a close call. Here's three reasons you perhaps wouldn't want to lime your walls.

1. No matter what you do, lime always tends to whiteness. Strong, vibrant colours are hard to create naturally. So if you want that, you'll need to buy some natural paints. Even so, expect a high level of fading.

2. Lime definitely doesn't emit the same warmth as earth plaster, though lime does create another type of magical atmosphere. And there are tricks for increasing the cosiness, things like leaving earth plaster skirting boards, earth plaster sculptures and alcoves.

3. As mentioned above, if you don't add a binder, it can leave white dusty marks on your clothes or furniture.

How eco-friendly is lime? Isn't it just as bad as concrete?

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Want to know how to use lime in more depth?
If you want to explore the Amazing World of Lime further, and learn how to use the white wonder, I have a new course out.  It includes videos, slideshow lectures, and PDFs, and is completely downloadable.
Learn More
I always update and add sections to my courses over time. Once you’ve enrolled in the course you’ll have access to all future updates.

The course includes:

  • Which kind of lime you should use for which job and in which climate
  • How to slake quicklime
  • How to mix and apply lime render
  • How to apply lime mortar and some tricks for a clean finish
  • How to deal with mortar guns when using lime
  • How to mix limecrete 
  • How to make a limecrete floor
  • How to use limecrete with tiles
  • How to create lime paint or lime wash with and without colours
Enroll in the Course
Disclaimer: All the content in The Mud Home website is provided for informational purposes only. The author undertakes no responsibility for any person or entity who chooses to use the information on this website. It is not intended to be a standard and should not substitute for the exercise of good engineering judgment by engineers. It is the user’s obligation to make sure that he/she uses the appropriate practices and consults the appropriate experts when building. It is the user's obligation to make sure they are following health and safety guidelines. The author is not responsible for any accidents, injuries or damages to persons or property incurred while using the information presented in this website.

Some blog articles refer to the use of lime. Please note, lime is caustic and can cause burns. Read The Mud Home guide to using lime safely here.

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The Mud Home  Copyright © 2013  Atulya Kerry Bingham
  • Home
  • Building
    • Earthbag
    • Earthquakes and earthbag
    • Rubble Trench Foundations
    • Off-grid how to >
      • Off-Grid Prep Course
    • Earth Plaster
    • Lime Wash
    • Mud as Mortar
    • Wattle and Daub
    • Mud Building Blog
  • Books
    • Dirt Witch
    • Mud Ball
    • Mud Mountain The Book
    • An Earthbag House in 7 Days?
  • About
    • Contact
  • Learn Mud
    • Courses
    • Mud Building PDF Package
    • Other Projects
  • Earth Whispering
    • Join the Earth Whispering Exploration
    • MUD MOUNTAIN