Wavy or straight?

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DannyMac said:
Nobody has said that a straight scratch is a British Standard.
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my reference to BS was just thrown -in as a general statement , .
you would think there would be an on-line place of reference for all to go and have a read, but then i suppose that would undermined there little business of selling each standard at about £80 each !!!
 
I was always told that wavy lines in the scratch coat made it so that if the topcoat cracked, for whatever reason, it was more difficult to follow than a sraight line.
 
Well I don't know in which planet you are building .. but on planet earth water runs down a vertical wall ...either you scratch wavy or horizontal you are not supposed to leave lines and i don't know for sure how much water a grain of sand can collect around it ... I feel sorry for the guys who work for you
 
Ness said:
Well I don't know in which planet you are building .. but on planet earth water runs down a vertical wall ...either you scratch wavy or horizontal you are not supposed to leave lines and i don't know for sure how much water a grain of sand can collect around it ... I feel sorry for the guys who work for you
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why dont you introduce yourself ness and tell us abit about what experience you have in the trade marra..........:RpS_thumbup:
oh and welcome to the forum...............:RpS_biggrin:
 
I used to scratch horizontally but started scratching wavy after reading this forum BS standards etc. I'm concerned that you don't get as good a key scratching wavy, when I scratch the tops and bottoms of the waves seem to close in, especially with Rendaid. I recently took some wet top coat off a wavy scratch and I would say it was 50% keyed in. Never had this with horizontal clear lines when I top coated you could clearly see the render.
 
AdcarPlastering said:
I used to scratch horizontally but started scratching wavy after reading this forum BS standards etc. I'm concerned that you don't get as good a key scratching wavy, when I scratch the tops and bottoms of the waves seem to close in, especially with Rendaid. I recently took some wet top coat off a wavy scratch and I would say it was 50% keyed in. Never had this with horizontal clear lines when I top coated you could clearly see the render filling the lines
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How do you edit your post?
 
Why don't you use a roller with rendaid?. I think it gives a better key than scratching
 
I was told if the bricks or blocks(substrate ) was wet or soaked with water scratch vertical wavy so it doesn't hold anymore water and any other time vertical wavy lines , I don't render very much but this sounded viable, and before anyone spouts about soaked bricks and as such on site you do as asked to get paid !
 
casplas said:
I was told if the bricks or blocks(substrate ) was wet or soaked with water scratch vertical wavy so it doesn't hold anymore water and any other time vertical wavy lines , I don't render very much but this sounded viable, and before anyone spouts about soaked bricks and as such on site you do as asked to get paid !
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horizontal *:RpS_scared:
 
Who writes these BS standards, an engineer or architect stuck in an office with a calculator ? A good plasterer will know this ' water' shouldn't "be running down the wall" but should be soaking in to the scratch, this being the chemical part of the bond which backs up the mechanical scratch.

i try to use the old irish method (where possible) by scratching with a yard brush, thereby giving the best mechanical key

Only saying like :RpS_thumbup:
 
irish_spread said:
Who writes these BS standards, an engineer or architect stuck in an office with a calculator ? A good plasterer will know this ' water' shouldn't "be running down the wall" but should be soaking in to the scratch, this being the chemical part of the bond which backs up the mechanical scratch.

i try to use the old irish method (where possible) by scratching with a yard brush, thereby giving the best mechanical key

Only saying like :RpS_thumbup:
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Giving away secrets passed down through generations,,how very dare you...
 
I passed an extension today which had just been scratched and whoever doing it had used a deviling float with the key in downward strokes. seen this a couple of times, cant see the logic behind it
 
I was shown wavy and never questioned it most jobs I've seen on my travels are wavy. Must admit I never questioned it as it seemed to work.
 
Olican said:
I passed an extension today which had just been scratched and whoever doing it had used a deviling float with the key in downward strokes. seen this a couple of times, cant see the logic behind it
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Around here, ALL I****n builders devil float the building sand:RpS_scared:
 
I was asked to price a topcoat on a temple last year. It had galv beads already rusting, bridged dpc, they'd scratched with building sand and keyed it by lightly brushing it in a vertical pattern lol
 
irish_spread said:
Who writes these BS standards, an engineer or architect stuck in an office with a calculator ? A good plasterer will know this ' water' shouldn't "be running down the wall" but should be soaking in to the scratch, this being the chemical part of the bond which backs up the mechanical scratch.

i try to use the old irish method (where possible) by scratching with a yard brush, thereby giving the best mechanical key

Only saying like :RpS_thumbup:
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johniosaif said:
Giving away secrets passed down through generations,,how very dare you...
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irish_spread said:
true John, we shouldn't be giving these trade secrets to the foreigners :RpS_thumbsup:
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There's no need for you two migrants to worry, it's impossible for us indigenous folk to get hold of 'yard brooms' since metrification came in.
 
beddy said:
I was asked to price a topcoat on a temple last year. It had galv beads already rusting, bridged dpc, they'd scratched with building sand and keyed it by lightly brushing it in a vertical pattern lol
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Couldn't turn that down could you..
 
gooner59 said:
used to be horizontal wavy ( was taught this way ) but now cant be arsed so horizontal straight ,

the reason it's supposed to be wavy (as its mechanical key being applied ) is because a wavy line is longer so more key is applied , just in case some are wondering lol.
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excellent answer - go to the front of the class :RpS_thumbsup:
 
puddove said:
excellent answer - go to the front of the class :RpS_thumbsup:
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Ive always remembered this after attempting to give a bollocking to my old apprentice for ******* about wasting time instead of just going straight....his collegue lecturer 3rd generation 40yrs on trowel type had told him gave this reason also!!!

it proper shut me up!!!!:RpS_blushing:....obviously still bollocket him though!!!:RpS_blushing:
 
zombie said:
Ive always remembered this after attempting to give a bollocking to my old apprentice for ******* about wasting time instead of just going straight....his collegue lecturer 3rd generation 40yrs on trowel type had told him gave this reason also!!!

it proper shut me up!!!!:RpS_blushing:....obviously still bollocket him though!!!:RpS_blushing:
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sorry @Gooners reply
 
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