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need info on rendering new block wall

Discussion in 'Plastering and Rendering' started by bomberns127, 31 Oct 2014.

  1. bomberns127

    bomberns127

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    hi people, i have a new 5m wall which needs rendering to match existing house, cant afford to get anyone in to do it so any advice about starting it will be much needed.
    im going to break it up into smaller sections with beading to make it easier to manage,
    i have been reading that i need to treat it with a cement slurry first?
    then roughcoat it to about 10mm deep, then key the surface, then i can apply the final coat, how long do i leave it between roughcoat and topcoat?
    do i put waterproofer into all the coats?
    do i wet the bare block with water/pva mix first, let dry then apply cement slurry? if so trowel slurry on?
    do i use a 3:1 mix to fix beading on the wall or the same mix as the roughcoat
    problem reading about it online can get a bit confusing as to the best way to approach this.
    hope someone can point me in the right direction.
    i have a bag of holm sand(mortar), is this the right sand to use?
    i have read differing opinions on using sand which sand is correct, sharp, plastering?
    1 website i read for advice called bricklayers sand- plastering sand?
    others say no to using holm others say they have used it with no problems,
    confusing!?

    thx in advance
     
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  3. roy c

    roy c

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    Have a look thru the back posts as there is a lot of information on this subject..
     
  4. nickjb

    nickjb

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    I think that is part of the problem. There are lots of posts with differing information over what sand to use, whether to add lime, which coat to put water-proofer in, how to prep the walls.
     
  5. roy c

    roy c

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    I totally agree with what you say but if you look for the posts of the regulars on here then you will get the proper information.... ;)
     
  6. bomberns127

    bomberns127

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    just a post to say thanks to all who contributed info, went for the professional tradesman approach, jigged the bank acc/bills and found enough, they did a spot on job, but thx again to all for contributions.
     
  7. Alastairreid

    Alastairreid

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    Just damp the wall down, use plastering sand 4-1, a dash of waterproofer/plasticiser, scratch.

    Next day 2nd coat 5-1 with plasticiser....coat and hit.

    :mrgreen:
     
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