The originator of the system used to supply hair to the lime market until the late 1930s. Simply dampening the surface with a mist spray may be all that is required, but on very porous surfaces such as old brickwork considerable wetting will be required. Plastering is one of the final steps in finishing an interior or exterior wall. Lime plaster walls need to breathe! www.naturalbuildingblog.com/hydrated-lime-mix-for-exterior-wall-plaster The successful application, bonding and correct hardening of lime plaster/render requires that the background should be clean, free from vegetation, free of containments and reasonably dry throughout the wall mass. The plaster used in this process is simply a mix of Type-S mason’s lime, limestone sand, and water. On dense or near impervious background, it may be necessary to apply a sand/lime splatter dash coat or consolidating harled coat to the background to act as a mechanical key. The fine bio material incorporated into the plaster has an insulating effect and increases the surface temperature of internal walls. Practice on small areas. Lime wash remains the traditional choice for finishing exterior lime plastered or lime rendered surfaces. I was prepping the area today. Why do plasters and stuccos have a scratch, brown, and finish coat? Lime Stuff Ltd        Unit 12        Glendale Farm,        Southampton Rd,        Whiteparish,         Salisbury, Wiltshire        SP5 2QW  01794 884 294. Unlike gypsum plaster or drywall, lime plaster is sufficiently durable and resistant to the elements to be used for exterior plastering. 3. To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. However the level of maintenance outside can be even greater as walls are less protected from the elements. Ancient buildings made of lime are still standing today. Lime plaster is a type of plaster composed of sand, water, and lime, usually non-hydraulic hydrated lime (also known as slaked lime, high calcium lime or air lime). Lime mortar can be cleaned off of bricks, unlike cement mortar, so bricks can be used again. In 3 coat work the first coat on masonry or brickwork is generally known as the scratch coat or render coat. Before the application of any new lime coatings, hydraulic or non-hydraulic, it is vitally important to check to the degree of suction within the background. Specialist advice should be sought, if the technique is considered where salt is detected on the mortar joints, rake out the joints to a depth of up to 50mm, as this is likely to be heavily contaminated and in a weakened condition and re point (See re pointing). Poor or excessive suction can result in a weak bonding with the substrate caused by rapid drying of the newly applied render, which will result and a weak and powdery interface which will lead to later failure and separation. Turn your Brick walls into a durable, resilient surface that beautifies as much as it protects with BioLime life-long lime plasters. Once the setting has been applied, it is scoured in a similar manor as the floating, to counteract shrinkage and then the surface can be left with a rubbed up rendered type finish or polished smooth with a steel trowel. Before applying the second coat, the first coat should be checked for shrinkage cracks. How to Plaster a Wall. When applied to a porous wall it soaks in, absorbs CO2 and reverts back to limestone. It was traditionally used to finish internal walls and applied in three layers known as the three coat system . 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