General Information on Plasters
The plasters used in plaster coating works shall be in compliance with the specifications.
Likewise the sand shall also comply with the specifications. In rough plaster coating works middle range sand (1- 3 mm) shall be used whereas in fine plaster and joining works fine sand shall be used. This sand shall be spread and left to dry and shall be fine sieved with a sieve of 1 mm holes.
Before starting to apply plaster, the overflowed plasters and other impurities on the surface to be coated shall be scraped to clean and the edges of the walls and ceiling shall be wetted with plenty of water or shall be washed if necessary. In order to prevent the wall to absorb the water in plaster, the plaster shall be wetted intermittently and at the necessary amount. Applying plasters on the outdoor surfaces under conditions like severe sun or wind is not recommended.
In case the material forming the wall is damaged in time due to frost or other effects, the plastering shall not start before carrying out the necessary corrective applications.
The joining parts of the wall to be plastered shall be left as they are and no trowel application shall take place. After the complete dry of the wall mortar, the plaster shall be applied. The wall plasters shall be applied in two coats, namely rough and fine. After the first coat rough plaster is applied, the rough surface shall be corrected by trowel frequently in order to ensure the adhesion of the fine plaster. Where the materials and construction style of the wall allows, single coat plaster may be applied.
Leveling bands shall be prepared with maximum two meters interval in order to have the vertical and horizontal leveling. The wall surface shall be coated with plaster by following the leveling bands and the cases.
After the rough plaster is hard enough, fine plaster shall be applied. The fine plaster surfaces shall be finished with trefoil, wood or metal trowel until a smooth surface is obtained.
In case there are metal or wood surfaces which need to be plastered on the wall surface, the plaster shall be applied to these surfaces after coating them with wire or metal rabitz.
The corners at the intersection points of the surfaces to be coated with plaster shall be sharp, rounded or beveled as stated in the special specifications.
Where the plaster is under coating or casing, the entrance tolerance shall be at least 2 cm.
For the plaster where it joins to the cases in doors without moulds, intersection joining or another measure should be applied in order to prevent the cracks at the joining places.