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what mix for rendering
- Thread starter kingie
- Start date
H
hotrod
Hi Kingie,
Ideally you want to do this in 2 coats, a scratch coat and then a float. Use sbr on your walls prior to rendering. First coat (scratch) should be a stronger mix than the final coat. I would go for a 3:1 (sand to cement) scratch coat with some waterproof additive (some spreads also prefer to put hydrated lime in the mix). Make sure you 'scratch' this coat to provide a key for the float coat. Leave the first coat to go off (overnight should be enough) and then apply a 5:1 mix for your float coat.
Enjoy and Good luck.
Ideally you want to do this in 2 coats, a scratch coat and then a float. Use sbr on your walls prior to rendering. First coat (scratch) should be a stronger mix than the final coat. I would go for a 3:1 (sand to cement) scratch coat with some waterproof additive (some spreads also prefer to put hydrated lime in the mix). Make sure you 'scratch' this coat to provide a key for the float coat. Leave the first coat to go off (overnight should be enough) and then apply a 5:1 mix for your float coat.
Enjoy and Good luck.
this is an absolute crime, and i think you may regret it.
you will have a constant maintenance issue for as long as you live there.
I would strongly advise against hard cement based renders and waterproofers. These will be prone to cracking and will almost certainly cause dampness. (assuming you are applying to a solid wall)
A good general purpose render in two coats using lime based mortar would be (1st coat) 2 lime to 5 sand followed by (2nd coat) 1 lime to 3 sand.
If you are concerned about impact damage on the soft lime finish you could replace half the lime with cement in the final coat. If you decide on this though I would limit it to the lower lift and stick with lime for the upper levels.
I would advise buying the lime in from a good lime supplier - Mike Wye Associates or similar. The quality of the lime is crucial to a good durable finish
The sand should not be too fine. Slightly coarser sand gives a pleasant texture, a more open pore structure and is less likely to crack.
If the surface has a good sound key you should not need any adhesive pre-treatments. If not SBR won't do any harm but a thin base coat of 1:6 cement sand applied with a tyrolean gun is better - but make it thin, not a full cover.
A good general purpose render in two coats using lime based mortar would be (1st coat) 2 lime to 5 sand followed by (2nd coat) 1 lime to 3 sand.
If you are concerned about impact damage on the soft lime finish you could replace half the lime with cement in the final coat. If you decide on this though I would limit it to the lower lift and stick with lime for the upper levels.
I would advise buying the lime in from a good lime supplier - Mike Wye Associates or similar. The quality of the lime is crucial to a good durable finish
The sand should not be too fine. Slightly coarser sand gives a pleasant texture, a more open pore structure and is less likely to crack.
If the surface has a good sound key you should not need any adhesive pre-treatments. If not SBR won't do any harm but a thin base coat of 1:6 cement sand applied with a tyrolean gun is better - but make it thin, not a full cover.
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