Plastering thermal blocks
- Thread starter ndmxp07
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ndmxp07 said:
you can use one coat plaster or a bond coat and then a finnishing plaster
you just need too keep the wall damp i use a water wich i just spray on
a quick metherd is too dip and dab with bonded and dry line using 9mm plaster board
you would not need too seal with pva presides it would take all day
plaster nvq 2
Don't use 'Bonding' as this is designed for low suction backgrounds and if used on Thermalites will crack and craze like mad.
To plaster straight on to Thermalites you can use sand/cement as the base coat or Thistle Hardwall Plaster. Both will need a top coat of Thistle MultiFinish plaster. For a small area like a conservatory I would prefer to use Hardwall as sand/cement is only cost effective for larger areas as you'll need a mixer etc. The end result from either method is much the same.
Before the base coat is applied, it is advisable to dampen the blocks just prior to plastering, using a hose or a Killaspray (garden sprayer). This reduces the suction from the blocks and stops the plaster being sucked to death.
To plaster straight on to Thermalites you can use sand/cement as the base coat or Thistle Hardwall Plaster. Both will need a top coat of Thistle MultiFinish plaster. For a small area like a conservatory I would prefer to use Hardwall as sand/cement is only cost effective for larger areas as you'll need a mixer etc. The end result from either method is much the same.
Before the base coat is applied, it is advisable to dampen the blocks just prior to plastering, using a hose or a Killaspray (garden sprayer). This reduces the suction from the blocks and stops the plaster being sucked to death.
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What do you dip 8x4 sheets of plasterboard in!
Dot and Dab
Keep reading those books nvq!
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A new product I have come across is called Medusa ...you mix it into a spatter dash coat and it acts to stop the suction for the floating or dashed coat . just used it on the scratch coat of a garage prior to a dry dash in white sand and cement ....perfect job, should be good on aereated concrete block as they are a bitch to render, dot and dab with drywall adhesive would be my choice
Regards
Robbo
No n.v.q. 2 just a quarter century of experience!
Regards
Robbo
No n.v.q. 2 just a quarter century of experience!
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That would be the one ..i had never come across it before.
When dashing you can add a good spot of regular waterproofer to the scratch for when you are spreading the white mix but on a warm day even if you gave it a wet down it tended to dry to quick cus the scratch was only surface wet due to waterproofer so I was using the big industrial hose on a regular plastercised scratch but a mate bought along some medusa and I was well impressed, are you familiar with it d.j. or am I over reacting about it!
When dashing you can add a good spot of regular waterproofer to the scratch for when you are spreading the white mix but on a warm day even if you gave it a wet down it tended to dry to quick cus the scratch was only surface wet due to waterproofer so I was using the big industrial hose on a regular plastercised scratch but a mate bought along some medusa and I was well impressed, are you familiar with it d.j. or am I over reacting about it!
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