sika 1????

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hi guys need some advice on sika1..
doing a damp course on a property where all the walls are stone.. normaly I would use sovereign k11 to tank in this situation but as im doing this work for my brother and I fancy having a go with sika 1 one after hearing a few spreads rave about it.

can I get some advice on how to use it. do still add rendercisser or need to add anything else to the mix?
whats it like to work with and how effective is it...

thanks for any advice!
 
Sika one is normally mixed at ten to one in the water, it strengthens the mix, I would do a scud coat on stone first, a five to one coat with fibres and mesh would do for damp proofing, nothing is to be added to sika 1 but its tough to work ,decent sand needed
ps did a lime coat breathable option not appeal?
 
Sika 1 best product in its field. Must mix at ten to one in the water as informed. Expensive but buying 25Ltr tub more cost effective.
Call sika technical for best cement sand mix
 
thanks guys..couple more qustions though... how much sika would 30m2 require, and if ifs so difficult to work with wouldn't it help to also ad some 3 in 1 maybe?

am I correct in thinking in this instance im best of chucking it on the wall to dub it out then spread scratch coat then putting on spatter coat for key.. then returning next day to topcoat? just im getting conflicting advice saying I could dub, scratch and top coat in one day which would be more ideal but im getting mixed advice..

also im not sure what constituts as 'good sand' I plan to use b n q building sand or travis perkins plastering sand... there both pretty much the same stuff and what I use for all rendering and damp proofing.. is this ideal

and if anyone can help with sand cement ratios that would be helpful as again im getting mixed advice.. bin told 3;1 is ok but ive seen sources saying 1;1 is required which seems excessive to me but im not clued up obviously with this prouduct..

thanks again
 
you are getting tanking and damp proofing mixed up, you can get the spec for tanking off of sika but they only push the ready mixed stuff and its expensive and you buy a few different products off of them, but for damp proofing, I would scud without waterproofer, strong slurry mix, the next day if suction permits you could scratch and finish depending on depth, i would not add anything to the sika 1, I would only use fine washed plastering sand for this and never building sand, it all depends on the depth of plaster and the suction, five litres will make fifty five litres of water /sika . so four buckets of water to a 5 litre sika can roughly, depends on how dry the sand is also...you could scratch at 3/1 but bear in mind if its a one coat finish as damp proofing is, it may crack, i normally use 4/1 as my strongest mix but many disagree..
 
you are getting tanking and damp proofing mixed up, you can get the spec for tanking off of sika but they only push the ready mixed stuff and its expensive and you buy a few different products off of them, but for damp proofing, I would scud without waterproofer, strong slurry mix, the next day if suction permits you could scratch and finish depending on depth, i would not add anything to the sika 1, I would only use fine washed plastering sand for this and never building sand, it all depends on the depth of plaster and the suction, five litres will make fifty five litres of water /sika . so four buckets of water to a 5 litre sika can roughly, depends on how dry the sand is also...you could scratch at 3/1 but bear in mind if its a one coat finish as damp proofing is, it may crack, i normally use 4/1 as my strongest mix but many disagree..


thanks johniosaif, I thought that as I cant inject as its stone I had to tank it and thought sika1 worked like tanking.. ether way wot ever you call the system if it will work im happy... it will work wont it? lol

wot do you mean by 'scud without water proofer, strong slurry mix'

there is quite a lot of depth to build..

if you don't mind johniosaif could you break down the process as in an idiot proof step by step coz im struggling lol.

appreciate your help thanks
 
Your asking the right bloke for an idiots guide.....................:RpS_wink:
 
Scud is splatter coat,slurry means a watery mix. if you are going to sika 1 tank it, I would mix water to sika at ten to one,, then mix a wet splatter coat with sikaat one cement to one sand, leave this to pull in for a few hrs, then apply a coat also with sika at 2.5 to 0ne, when this stiffens, apply a splatter coat at 2.5 to one without sika, keep this coat dampened, next day mix a 3 to one coat also with sika, it depends on how level you and flat you get it this time due to the depth, lots will rule and float it at this stage,and then apply a splatter coat without sika keeping it dampened for seven days and then apply a limelite coat to flatten and level it, too much sand cement thickness will allow it to crack due to the weight and strength of it, you can skim then after two days..with tanking the coats are brought into the floor in a curve to help prevent damp also, each coat overlapping the other..
 
I wouldn't trust injection would work as the stone work is not uniform enough to create a consistant barrier..

couple more questions johniosaifif u don't mind.. I think in some areas I will be able to float level with two coats but because of the depth il struggle on best part of it..

firstly why does it need to be kept damp then toped after seven days,

secondly if I cant get the depth at this stage cant I give it a third coat of sand cement on day 3 maybe?(time is not an issue for me with this job as its unpaid for my brother and im trying to get experience using a different system)

and at the risk of being slated... couldn't I use bonding to top it or sand cement with 3 in one in opposed to sika as it will have already have two good coats on?

thanks again mate
 
kept damp to stop drying as its very strong mix.. you can keep coating on subsequent days as long as it has a splatter coat without sika but probably best to leave it to cure, cant say I ever left it to cure though due to time constraints and cost implications. have you considered a membrane system then 2x1 fitted, plumbed and boarded, very simple and very effective
 
Sika1 is sh1t. They tell you have to use 'spritzer' coats and their tech helpline is pants. I phoned them once when I d gone by their spec and the system had failed. They asked me "what did you mix it with" ?. I said a Belle cem mixer, they said, no, I should have used a normal plastering drill. A week later, just for the Craic, I phoned them with the exact same scenario. "How did u mix it mate" ? , with a plastering drill I said. "No, u should have used a cem mixer ". The idiots havnt got a clue.
Phone Sovereign, proper company, good tech support and their products are the dogs
 
If I was you I would make sure you put plenty of SBR in your mix, I have used sika 1 its expensive and it makes the render go off handy.

Never put lime in an area prone to damp its a hydrated material meaning is sucks up moisture like a sponge.
 
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