I intend to render an outside concrere block wall, is there any advantage adding lime to the mix, and how much

Answer 1

My husband says they used to add lime but he doesn't know why. It used to be a lime and mortar mix but he doesn't know if they used it for rendering. They don't do it now though he said. By the way you need to be very skilled to render he said otherwise it will look ****. Hope this helps.

Answer 2

The main uses of lime are plasticising and you the curing time is of less. In stonework it is used instead of cement because it is easier to remove a mortar joint rather replace a stone. If the weather is severs in your area use a cement based mix. Lime is good in renovation but if the ancient builders had cement you can bet your bottom dollar they would have used it
Stonemason lecturer

Answer 3

I never used lime until I worked on the same job as an old time plasterer. He insisted on lime and it gave him more time to get a good finish. He said it had something to do with holding more water. He used 1 part cement one part lime five parts plastering sand. Hope this helps.

Answer 4

I can see no advantage in adding lime, myself i would just use plastering sand portland cement and a waterproofing addmix,paint wall with a mixture of water and pva woodglue whilst still tacky apply render ,first coat level then scratch,when dry add second coat of render smmoth out and leave to dry out completely,job done

Answer 5

the reason for adding lime was to make it easier to work with (it makes it more buttery)these days they have additives like febmix to do the same job
first prime the wall with a waterproof adhisive like unibond or similar and add some to the mix the person following you to do repairs of cutting through it will curse you but it will stand the test of time

Answer 6

Lime will make it more workable. Add about 1/4 of the cement

Answer 7

Lime slows down the drying time so the concrete will less likely crack so I would say yes use it and add a squirt of washing up liquid honestly it makes it much more workable

Answer 8

Instead of lime, put a bonding material in the mix, ie trubond, there are loads on the market.

Answer 9

i'm renovatng in France and we use lime all the time...it allows the stonework to breath....don' know about cost in uk but it is cheap in France. B&Q do a lime based chalky emulsion..can vouch for that...lovely paint....

Answer 10

Not really any advantages that I know of. I've never heard of doing that. My dad has been in construction for 30 years.