something to remove cement from granite

[scottishjohn]

on one outside wall of the house there was a lean to pantry at sometime 

this was hard cement plastered and tiled 

 the lean to has gone ,but looking to remove the remains of the cement render from the granite walls 

its real bugger to chisel off and I will never get it all off all over 

 thegranite walls are not smooth in anyway 

 

Edited May 18, 2022 by scottishjohn

[Linto]

Would this work? Never tried it myself but may help? Most of the alternatives are acid based so not very friendly to use.

[scottishjohn]

I don.t know  if chemstrip would work 

 or if it would eat the granite away as well 

 or if it will take more than just staing off

 great if i could just paint it on and let it softenen al the old ceoment render  and then wire brush it off

I will speak to "sika " and see

 

Edited May 18, 2022 by scottishjohn

[Russell griffiths]

Sand blaster. 

[scottishjohn]

16 minutes ago, Russell griffiths said:

Sand blaster. 

yes that would , non local so costing will be high  and  i,m already worried i will run out money ,

[dpmiller]

if it's not a massive area, buy a small blasting gun and do it yourself. Slow and messy but doable

[scottishjohn]

the reply form SIKA  techn ical is yes but it might take a few applictions to take it off in layers

so we,ll give it a try 

 and report results

Edited May 19, 2022 by scottishjohn

[scottishjohn]

10 minutes ago, dpmiller said:

if it's not a massive area, buy a small blasting gun and do it yourself. Slow and messy but doable

that will require a  large compressor and I do not have  power on site other than a generator --so will go with chemical attack first 

[dpmiller]

spot/ small area guns will work off a 2 or 3HP pump OK. What depth is this cement? A needle gun would be an option too...

[scottishjohn]

9 minutes ago, dpmiller said:

spot/ small area guns will work off a 2 or 3HP pump OK. What depth is this cement? A needle gun would be an option too...

yes and that also needs a compressor --Iknow the one Iused have at work used about 10cfm --so small compressor would not do 

the std calc is 4cfm per hp for compressors-and would need a fairly big tank to smooth it out 

depth of cement render is up to 20 mm inplces --I,m sure they used the same granite sand as they did with the pointing -they would have any amount of it from crushing rocks 

 

hard as hell---

[SteamyTea]

Weather and time.

[Simplysimon]

11 hours ago, SteamyTea said:

Weather and time.

i think he wants it removed before his great, great grand kids die 😂