Lath plaster vs drywall11/23/2023 ![]() The second coating (referred to as the floating layer) was applied to provide a much smoother surface for the final coating - this second coating was about 6mm (1/4 inch) thick.The first coating applied (referred to as the render layer) was applied so that it partly went through the gaps between the laths so achieving a strong bond - this coating was about 8mm (3/8 inch) thick and was left with a unsmoothed surface. ![]() Lath and plaster walls were traditionally covered with three coatings of different lime putty mixtures: The laths are spaced to give a gap of about 6mm (1/4 inch) between them - this gap provided the 'key' for the plaster coating. The laths are horizontal strips of wood (normally about 25mm by 6mm (1 by 1/4 inch)) fixed by nails to vertical upright timbers forming the framework of the wall. Lath and plaster walling techniques (see right) were commonly used from the early eighteenth until the mid twentieth century for internal, non-load-bearing walls. Traditional lime putty plaster used in older constructions are a lot softer than modern gypsum plasters and the two should not be mixed.
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