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k2 red telephone box
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How I made my K2 Telephone Box
Author: Les Kenny; Editor: Maree Anderson
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Step 1.4. Hypertufa

Hypertufa (in a sense) is a lightweight concrete.

Some expert advice: The success of hypertufa depends on the consistency of the mix and the amount of attention paid to the curing process.

Okay! Having read stories about other people's less than perfect hypertufa attempts resulting in cracked and crumbling end results, I decided to take the above advice very seriously.

My hypertufa mix hypertufa mixture
● 3 buckets of peat moss
● 2 buckets of perlite
● 2 buckets of cement
● 2 plus buckets of water (more or less)

The peat moss and the perlite was bought from a garden center and the cement from a building supply store.

Some safety stuff: Breathing in any of the above ingredients (except the water) is not good for your health. Wear a mask, goggles, gloves, and appropriate clothing. The ingredients are very light and any wind or mixing disturbance will cause the dust particles to float through the air.

mixing hypertufa in a wheelbarrow The mixing
The above dry ingredients were poured (carefully) into a wheelbarrow and mixed together with a spade.
Then the water was poured in slowly - about 1/2 of a bucket at a time - and the mixing continued.
It was mixed with the spade from underneath and folded over. Mixing and adding water continued until the mix was a uniform consistency: wet enough without puddling and able to be spread without crumbling.

Tip: A smaller spade or shovel is easier to work with than a bigger one.

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