How much plasticiser do I need for render mix?
slapiton New Member. for a half bag mix in a small mixer add one cup full of waterproof and one cupful of placticiser to a bucket of water.
Do you put plasticiser in render mix?
For Top coat the mixing process is exactly the same. Except NO mortar plasticiser, Replace this with Waterproofer, Around a cup full with water . If you are near the coast maybe half a cup more .
What is the mix ratio for render?
A common mix ratio used for rendering is 6 parts sand, 1 part cement and 1 part lime. Any general purpose cement can be used, although the sand should be fine and clean of impurities. Coarser sand is usually used as the base layer and slightly finer sand for the top layer.
How much Waterproofer do I add to render?
Mix 3 parts sand to 1 part of cement. Mix gauging water with Permaproof Waterproofer Render Additive at 30-1 ratio as specified. Add minimum amount of gauging water to dry mix to ensure a dense coat. An approximation of not more than 8 litres per 50 kilos of dry mix should be used as a guide.
Do I need lime in render mix?
Lime is used to increase the elasticity of the mix, and prevent it from cracking once it dries. The most appropriate kind of lime to be used for rendering is hydrated lime. Other things could also be added to the rendering mix, such as colour-altering pigments, or additives that aid bonding and drying.
Do I need to add lime to render?
How do I make the perfect render mix?
A standard ratio used in creating this mix is 6 parts sand, 1 part cement, and 1 part lime (6:1:1). There is no particular type of cement that should be used; any kind will do. However, the sand used ought to have a fine texture and be free from impurities. The best type of sand to use is rendering or plastering sand.
Can you use plasticiser instead of lime?
Hi Keith, As you say you shouldn’t need to use a plasticiser with lime – it is more to do with the sand. Sharp sand does provide extra strength among many other benefits but the big drawback is less workability.
Why do bricklayers use washing up liquid?
Washing up liquid is commonly used as a plasticiser in cement mortar. That said, it is a very common practice in the UK, and is used in training brick laying as it can prevent the mortar from setting so it can be re-worked or re-used.
What should mix ratio be for sand plastering sand?
Hi Kem_53, as for the sand plastering sand is good but i was brought up on building sand and it’s been used for decade’s so either or. The mix ratio should be kept at 4 to 1,using a plasticiser will make the mortar mix workable (and less like mud). your additives can be picked up from any building merhcants or b&q.
What kind of mortar do you mix with plasticisers?
Plasticisers will usually mix with most types of mortar. Some products may specify not to mix with lime-based mortar or floor screed mortar. Forms of calcium carbonate including limestone are used to make construction-ready lime. Lime can be added to mixtures to form mortars such as non-hydraulic lime mortar and hydraulic lime mortar.
What can plasticizers be added to to make it soft?
For example, plasticizers are commonly added to polyvinyl chloride (PVC), which otherwise is hard and brittle, to make it soft and pliable; which makes it suitable for products such as vinyl flooring, clothing, bags, hoses, and electric wire coatings.
What do you need to know about plasticizers for concrete?
For concrete. Plasticizers or water reducers, and superplasticizers or high range water reducers, are chemical admixtures that can be added to concrete mixtures to improve workability. Unless the mix is “starved” of water, the strength of concrete is inversely proportional to the amount of water added or water-cement (w/c) ratio.