Rendering mix ratio for external and internal wall | best mix ratio for rendering | best sand for rendering | render mix ratio.
Rendering is the process of applying of lime cement mortar to external, internal or partition brick/ block walls to achieve highly finished, good texture and smooth surface, which give us easthetic and beatiful appearances, it should be waterproofing and fire rating qualities.
Its other name is plastering, very much common and used in European countries particularly around mediterranean like Albania, Algeria, Bosnia and Herzegovina, Croatia, Cyprus, Egypt, France, Greece, Israel, Italy, Lebanon, Libya, Malta, Monaco, Montenegro, Morocco, Slovenia, Spain, Syria, Tunisia, and Turkey.
Best mix ratio for rendering
The main ingredients of renders are Portland cement, sand, lime, water and some approved addmixture, normal, commonly used, standard, most suitable, recommended best mix ratio for rendering is 1 parts Portland cement to 1 parts lime to 6 parts sand represented as 1:1:6 (1 cement: 1 lime: 6 sand), this mix can be used for first coat and finished top coat for external and internal wall.
Any general purpose cement can be used and sand must be fine rendering sand clean and free from impurities. You do not use building sand for rendering because it may causes shrinks and cracks.
Renders is mix with some additives material that increases the bonding strength and slowing in drying or hardening, adding lime in mix increases the plasticity, flexibility and workability that can reduces the chance of cracking after drying. Pigmentation of colour should be done according to aesthetic requirement. A thin finishing top coat can be applied to achieve decorative effect, it can be applied by using trowel, brush or sponge.
Rendering mix ratio for external and internal wall
Typically, most of renders are made of Portland cement, sand, water, lime and some approved additive ingredients, standard rendering mix ratio for external and internal wall is 1 parts cement to 1 parts hydrated lime to 6 parts sand by volume, which is represented as 1:1:6 (1 cement: 1 lime: 6 sand), for this mix, any general purpose cement can be used and sand should be fine and clean of impurities, coarser sand is usually used for base layer and finer sand for the top layer.
How thick should render be?
Thickness of render depending on types of application, external and internal wall, thickness of render for external wall should be 10mm, 12mm or 15mm for first coat and finished second top coat should be 5mm, 6mm or 8mm thick, never be exceed from 20mm. Thickness of render for internal wall should be 1 coat of 10mm, 12mm or 15mm thick, if 2 coat is applying, then first coat should be 10mm thick and second top coat should be 5mm thick.
Minimum and maximum thickness of render
Thickness of render depending on types of application, external and internal wall, plane or rough face, minimum thickness of render should be lying between 10mm, 12mm to 15mm and maximum thickness of render should be do not exceed from 20 mm, either contain 1 coat or 2 coat.
Best cement for rendering
Regarding this, “best cement for rendering”, Any general purpose cement can be used for rendering, that should be either made from Portland stone, dust, slug or fly ash. Ordinary Portland cement of grade 43 looking as best to use for rendering, pozzolanic Portland cement (PPC) also looking good but it can causes fast setting and Portland slag cement used especially in marine area. So do not confuse with best cement for rendering, looking over the market, which is available, select the best cement as per your choice and requirement.
Best sand for rendering
Regarding this, “what is the best sand to use for rendering”, Sand must be plastering or rendering sand, it should be clean, fine and free from any organic impurities. You do not use building sand for rendering because it may causes shrinks and cracks. You can use some amount of building sand as base coat, but it does not seems like that it is primarily sand for rendering.