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Long-Slaked Lime for Stucco, Proved with the Hoe Test (Vitruvius, Book VII)
Mary

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Mary

15. November 2026FI
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Long-Slaked Lime for Stucco, Proved with the Hoe Test (Vitruvius, Book VII)

Vitruvius's rule for stucco lime: slake the best lump lime in water a good while before use, so under-burnt lumps finish slaking in the pit instead of blistering on the wall, then prove it with a hoe: lime that sticks to the iron like glue is fully tempered.
Beginner
A good while of slaking (he gives no time), then minutes to test

Instructions

1

Read Vitruvius

"This will be all right if the best lime, taken in lumps, is slaked a good while before it is to be used."
2

Slake the lumps

Put the best lump lime in the mortar bed and slake it in water (ours: cover it and keep it covered with water). Leave it a good while: any lump not burnt long enough in the kiln throws off its heat in the long slaking and comes to the same consistency.

Materials for this step:

QuicklimeQuicklime1 piece
WaterWater1 piece

Tools needed:

Mortar BoxMortar Box
ShovelShovel
BucketBucket
3

Hoe test

Chop into the slaked lime with a hoe as if hewing wood. Sticks in bits: not yet tempered, wait. Iron comes out dry and clean: the lime is weak and thirsty. Sticks to the tool like glue: rich and fully tempered, ready for stucco.

Tools needed:

HoeHoe
4

Troubleshooting

Stucco lime troubleshooting.

Flow

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5

History and honest limits

From Vitruvius, **The Ten Books on Architecture**, Book VII ch. II, tr. M. H. Morgan (1914), pp. 204-205 (checked on the archive.org scan vitruviustenbook00vitruoft). He gives no slaking time and no water amount; keeping the lime under water and the safety notes are ours.

Materials

2
  • 1 piece
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  • 1 piece
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Tools Required

4
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