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Dot and dab was introduced in an attempt to increase the insulation value of walls.
For a decent plasterer dot and dab is no quicker than bond and skim
Absolute not, dot and dab was only introduced to speed up construction for mass produced domestic building no waiting for drying periods when a three layer plaster construction was normal to plaster a house, there is no thermal advantage to plasterboard unless it has a insulation layer in its construction, in which case a 35mm box would fit behind it, dot and dab is completed in one day, traditional plastered walls takes three days, plus a drying period, don't know if you have ever worked on any sites, but you obviously have not seen traditional plastering done correctly.
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you mean lath and plaster with half a horse's hair in the plaster, or straw walls?
Not straw wall, but cob walls.