Wattle & Daub: Craft, Conservation & Wiltshire Case Study
Contents 2 History
3 Craft
3.3 Panel Types
3.4 Staves
3.6 Daub
3.7 Decoration
4.1 Soils
4.1.1 Constituents
4.1.2 Plasticity
4.1.3 Strength
4.1.4 Field Testing
4.1.5 Selection
4.2 Dung
4.2.2 Lignin
4.2.3 Urine
4.2.4 Microbial Debris
4.2.5 The Role of Dung
4.3 Fibre
5.2.3 Maintenance
5.3 Repair
5.3.1 Partial Renewal
5.4 Replacement
5.4.1 Brick Infill
5.4.2 Renewal
6.3 Fieldwork
6.5 Evaluation
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4.1.3 StrengthA weak daub may fail if it has insufficient cohesive
strength to prevent it delaminating from the wattle or from failure within the
body of the clay. In a vertical panel the critical stress is shear. The strength
of a soil sample can be measured in the laboratory using either the vane method
or small shear
box.[56]
After application, a daub is not under a compressive load and will therefore
fail in shear if its ‘apparent cohesion’ is
exceeded.[57]
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