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Weber Monocouche - should it REALLY look like this?

Discussion in 'Plastering & Rendering Projects' started by DaveH22, Nov 28, 2017.

  1. DaveH22

    DaveH22 New Member

    Our builder, Bovis Homes and NHBC seem to think this is acceptable.
    House was built over a dry summer (2014).
    Extremely worried we can see the Celcon blocks underneath.
    What do you guys think?
     

    Attached Files:

  2. Cornelius

    Cornelius Well-Known Member

    Yeah I’ve seen that before with that type of finish , not quite as bad as that though. Give it six months and it will be filthy with dirt too.
     
    • Funny Funny x 1
  3. madmonk

    madmonk Private Member

    ghosting at it's best that's why I always do a base coat stops this
     
    • Like Like x 1
  4. Cornelius

    Cornelius Well-Known Member

    IVe always called it grinning, what’s happened? Blocks not fully dried out before rendering? Damp cavity? What’s the cause of it? Quite common problem I see on the newer houses
     
  5. madmonk

    madmonk Private Member

    it's ghosting mate material might be on too thin then you get this also the cement joints lighter can show through I never get this when using a base coat at roughly 6mm
     
    • Agree Agree x 2
  6. Cornelius

    Cornelius Well-Known Member

    You avoid one coat systems?
     
  7. Topspread16

    Topspread16 Active Member

    It’s with top coating on block with no base, water holds in the compo bed a lot longer than it does it the block. If would of been sealed it may of prevented it a little longer.


    Sent from my iPhone using Tapatalk
     
  8. Cornelius

    Cornelius Well-Known Member

    Don’t often get this problem in good old sand cement finishes:)
     
    • Like Like x 1
  9. Daz76

    Daz76 Member

    Laid on too thin and should always base on celcon or similar block. Goes to prove what we all know.. big boy house builders are full of sh*t and have got the nhbc in their back pocket...f**kin jokers the lot of em
     
  10. vfr12

    vfr12 Private Member

    Ffs the job has been done in 2014! If the pointing was wet or whatever till now would have been ok. To the op- if you want it redone , hack a small piece and show it to the c**t that tells you is ok! I guarantee is under 15mm and you have case there!
     
    • Like Like x 3
    • Agree Agree x 3
  11. Topspread16

    Topspread16 Active Member

    I gets wet when it gets rained on it’s a porous breathable surface. Whether it’s 10mm thick or 30mm the outcome would be the same. Its the base and mesh that prevents the block reading through


    Sent from my iPhone using Tapatalk
     
  12. vfr12

    vfr12 Private Member

    It’s not, it’s the overall thickness of the render and the ability to deal with soaking/ drying. basecoat or not has very little to do in this case. Moisture is getting behind which in normal circumstances , @15mm say, it’s not very likely.
     
  13. madmonk

    madmonk Private Member

    I recon it's about 10mm thick straight onto the block
     
  14. madmonk

    madmonk Private Member

    if you can spray a good 15mm onto block that will be ok I only use a base coat cos it cuts down on mixing cos I haven't a machine so horses for courses
     
  15. Nicm

    Nicm Well-Known Member

    Too much mortisicer used by block layers can cause the joints to show in the scratch coat.Theres one block layer local to me and he must have an additive fetish,Empty 5 gallon drums of the stuff everywhere.
     
    • Like Like x 1
    • Agree Agree x 1
  16. Mad monks on the money on this one,it's too thin otherwise you would see it on all mono jobs up and down the country,his guess is probs right one coat sucked in causing this coz it's not deep enough,spraying is fine you get yer depths mixing by hand big areas different ball game,
     
  17. gps

    gps Private Member



    Contact Weber, get their advice then go back to bovis and nhbc if Weber believe application error has happened.
    Nhbc are useless mind, and not fit for purpose.
     
    • Agree Agree x 1
  18. flynnyman

    flynnyman Private Member

    Thought that's what micro was for to even out the suction? I recon it's dried at different times i.e. Blocks and mortar which will have a slight colour difference. Shows up more in the rain also I think this should be done in two coats personally.
     
    Last edited: Nov 29, 2017
    • Agree Agree x 1
  19. Builderboi

    Builderboi Well-Known Member

    Ffs just paint it
     
    • Agree Agree x 1
  20. kebab king

    kebab king Private Member

    Its schocking to see that, such a pity cos it looks quite neat from the photos.
     
  21. Jrend

    Jrend Active Member

    Bovis use a lot of celcon/lightweight block which is not suitable for mono of any kind. Any celcon block should have a base coat either rend aid micro hp 12 being the main 3 . The bovis sites we do have all changed now to 7nwt solids.
     
    • Agree Agree x 3
    • Like Like x 1
  22. zombie

    zombie Private Member

    More to the point why build a brand new house in block work and render!!!!

    Render is shite end of!... only good for hiding discrepancies or otherwise known as fook ups in the building game!

    Wouldn't have a rendered house given me personally!
     
    • Agree Agree x 2
  23. Ritch

    Ritch Member

    Bovis build both skins with thermalite block round my ways and prime the block before colour render goes on to control suction but it don’t do f**k all and all the houses look like this when it rains and I’m on a Barratt site rite next door there built with concrete block and no probs at all
     
    • Like Like x 3
    • Useful Useful x 1
  24. DaveH22

    DaveH22 New Member

    Thank you! That’s incredibly interesting.
    I don’t suppose you have any technical reference I can quote do you?
     
  25. Danny

    Danny TPF OWNER

    :D
     
  26. flynnyman

    flynnyman Private Member

    Because of a massive brick shortage, sand shortage, skilled bricklayers and maybe quicker to finish the insides? And I agree rendering is a poor mans brick ;)
     
    • Agree Agree x 1
  27. Daz76

    Daz76 Member

    Contact weber s technical department and they ll let u no what materials should hav been used on the block . It ll b worth finding out the details of the celcon blocks used on the house 1st but u ll get all.that off the manufacturer aswell. And bovis+nhbc will hav to give u all the information u need. If ot put it all ova facebook etc u ll b suprised how quick bad press gets them moving
     
    • Like Like x 1
  28. madmonk

    madmonk Private Member

    You can bet your life Weber will say should have rendaid on anything less than 7n blocks
     
    • Agree Agree x 1
  29. Vincey

    Vincey Private Member

    Tbf it’s the building company who should be sorting a solution imo
     
  30. simplybesty

    simplybesty Private Member

    Lol, contact Weber and all they will do is blame the renderer. The builder will just paint it .
     
  31. Rigsby

    Rigsby Private Member

    Don’t remind me!

    You did warm though.
     

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