Skim over ocr 3?

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Got a jobbi coming up and was considering using ocr3 as backing, I like this gear but have never skimmed over it. Is it possible to do so and if so how succesful is it. Also have considered CPI but can only get this by the pallet, Hardwall is possible but dont really fancy it as we have been using this for the last 4 months and am sick to death of it.
 
Plastered over render I put up a month ago today WOW forgot how quick the first coat sucks in banged on five walls had to second coats straight away with very wet coat still sucked in quick fours hours chasing it all day knacked!
 
finefinishwales said:
Plastered over render I put up a month ago today WOW forgot how quick the first coat sucks in banged on five walls had to second coats straight away with very wet coat still sucked in quick fours hours chasing it all day knacked!
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I remember that with sand and cement. Sucks that much it crazes! I always put a waterproofer in. Then it doesn't go in at all and then flash sets! Can't win.
 
Funny enough i thought about this the other day when i rendered a pool with OCR- tiling , but i thought you may get away with it on ocr-tiling as it has no lime-in the mix, where as the other ocr's have lime and you would risk Ettringite failure ........ :-)
 
Im under the impression that ocr contains waterproofer or am i wrong? Hardwall would be a bitch as the walls are 3.5m high and 16m long, I was thinking that with ocr we could float all day and skim the next if it contains waterproofer.
 
malc said:
i would use hardwall, cement and sand backings went out with the ark.
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Why do you think that Malc? I would personally always float with S&C given the choice.

Priceplastering said:
Im under the impression that ocr contains waterproofer or am i wrong? Hardwall would be a bitch as the walls are 3.5m high and 16m long, I was thinking that with ocr we could float all day and skim the next if it contains waterproofer.
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You shouldn't skim the day after with S&C, it needs to cure. The only advantage of Hardwall over S&C on smaller jobs IMHO.
 
I agree with andy, lots of advantages to sand and cement compared to hardwall, especially on refurbs, where there is need for a heavy coat or dampness , s/c is much cheaper and cleaner and you can add additives as required, I now do leave s/c walls for a week before I skim but I did not before joining this forum.
 
Just finished another floating session today with CPI and got a 4 bedder Monday. Its lush to set on.
 
essexandy said:
Why do you think that Malc? I would personally always float with S&C given the choice.

i do like to use hardwall , it pulls the set in and leaves a nice job .i like to float in the morning set in the afternoon and leave an area finished.
sand and cement repels the set and is hard work.
my nephew can hod sand and cement up 3 floors all day long, but you do not find many labourers that are able to hod .
the last time we floated in sand and cement the builder ordered ready mixed mortar with a retarder in, we floated 4 houses before we could turn back to set
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carlos said:
As said above S+C all the way. The only down side with it is it's heavier gear to work with.
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It is heavier but a hell of a lot less sticky than Hardwall which I find makes it easier to work with.

AdcarPlastering said:
I skimmed over OCR3 last week, weak PVA on first, skimmed up lovely, just right.
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Why the need for PVA Adcar?

malc said:
essexandy said:
Why do you think that Malc? I would personally always float with S&C given the choice.

i do like to use hardwall , it pulls the set in and leaves a nice job .i like to float in the morning set in the afternoon and leave an area finished.
sand and cement repels the set and is hard work.
my nephew can hod sand and cement up 3 floors all day long, but you do not find many labourers that are able to hod .
the last time we floated in sand and cement the builder ordered ready mixed mortar with a retarder in, we floated 4 houses before we could turn back to set
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Sorry if I'm being dumb Malc but what do you mean by that?
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Im guessing he means the waterproof in sc lets the skim set properly rather than pull it in like hardwall
 
av never used hardwall, so do you have to pva before you skim it or can you just lash on??
 
Artisan998 said:
av never used hardwall, so do you have to pva before you skim it or can you just lash on??
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when floating hardwall, it is all to do with suction. on a very high suction block we will float and set twice a day, low and medium suction float in the morning set in the afternoon. the day is well balanced busy floating, easy setting.
i have never had to use pva on hardwall. we floated a conservatory one afternoon, left it over night, sprayed it lightly with a hose and set it next morning in about a hour.
 
essexandy said:
It is heavier but a hell of a lot less sticky than Hardwall which I find makes it easier to work with.

malc said:
Sorry if I'm being dumb Malc but what do you mean by that?
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sand and cement is mixed to your own spec. or the labourers ,if he knows how much cement he has put in the mixer. therefore not a recognized backing by british gypsum.
with hardwall you just add water and you have got the correct mix.
i like the way hardwall pulls the set in giving you a nice finish.
multi finish hangs wet untill it sets,
sirapite skimmed sand and cement a lot better, but there again it was the plasterers own mix as we added thistle board finish and lime to sirapite as we required.
that is why they brought out multi finish to stop us from purchasing the lime from another company
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malc said:
sand and cement is mixed to your own spec. or the labourers ,if he knows how much cement he has put in the mixer. therefore not a recognized backing by british gypsum.
with hardwall you just add water and you have got the correct mix.
i like the way hardwall pulls the set in giving you a nice finish.
multi finish hangs wet untill it sets,
sirapite skimmed sand and cement a lot better, but there again it was the plasterers own mix as we added thistle board finish and lime to sirapite as we required.
that is why they brought out multi finish to stop us from purchasing the lime from another company
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S&C might not be a recognised backing by BG but that doesn't mean it "repels" the finish, does it?
One of the reasons I like using S&C is the nice bit of suction I get off it when skimming, rarely found the Multi to just hang to wet on it.
Unfortunately Malc I'm also old enough to have worked with Sirapite.

AdcarPlastering said:
Control suction?
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Wow how come you were getting so much suction you needed to take such measures?

Priceplastering said:
Sorry got carried away ive always been told not to skim on s&c for a minimum of 24 hrs.
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24hrs isn't enough for S&C to have cured properly mate.
 
essexandy said:
It's only a problem on smaller jobs though isn't it Malc. I've done hundreds of houses in S&C without any issues.
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i know that over the years we have floated more houses in sand and cement then any other material. imo sand and cement has now been supersede by hardwall. browing was to soft and got damaged to easily. for me hardwall is a quality job.
i have seen keying problems with sand and cement on celcon/solar blocks . the modern block has very poor face for keying.
 
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