Rigid LVT tiles onto chipboard floor

Hi
I'm about to put the top floor down in my bathroom project. The new P5 green chipboard subfloor is level and the tiles are waterproof click type Malmo Marta with built in membrane.
Just wondering if the floor needs any further treatment before laying them.
Any help appreciated.

Comments

  • grumbler
    grumbler Posts: 58,605
    Name Dropper First Post Photogenic First Anniversary
    Forumite
    I guess you mean built-in underlay, not membrane. Personally, in a bathroom, I'd possibly add a membrane on the top of the chipboard. With the sides folded up. Just in case.
    We are born naked, wet and hungry...Then things get worse. :(

    .withdrawal, NOT withdrawel ..bear with me, NOT bare with me
    .definitely, NOT definately ......separate, NOT seperate
    should have, NOT should of
    .....guaranteed, NOT guarenteed
  • danrv
    danrv Posts: 1,379
    First Anniversary First Post Name Dropper
    Forumite
    grumbler said:
    I guess you mean built-in underlay, not membrane. 
    Yes sorry, underlay. 
  • danrv
    danrv Posts: 1,379
    First Anniversary First Post Name Dropper
    Forumite
    The Malmo instructions state that the tiles can be installed directly over prepared solid & flat floorboards. 
    A membrane would have to be really thin to prevent any give or flexing. Some I've seen is between 2.5mm - 5mm thick.
    Something like this might do if overlapped.
    https://www.bathroom2kitchen.co.uk/accueil/1880-mapei-waterproofing-sheet-membrane-wp-200-1m-cut-1m-width-044-048mm-thickness-blue-mapeguardwp200-1m-0750122369409.html


  • grumbler
    grumbler Posts: 58,605
    Name Dropper First Post Photogenic First Anniversary
    Forumite
    edited 17 November 2023 at 11:31AM
    With an overlap you have to seal  it reliably.

    For solid wood planks on a concrete slab I used blue DPM from BnQ (plus thin underlay). 
    SF sell similar 3x4m black one - https://www.screwfix.com/p/capital-valley-plastics-ltd-damp-proof-membrane-black-1000ga-3m-x-4m/50464 
    Not sure if it's any different for LVT, but, if needed, you you can heat the membrane a little with a hair drier or a heat gun to make is softer when laying the planks.
    We are born naked, wet and hungry...Then things get worse. :(

    .withdrawal, NOT withdrawel ..bear with me, NOT bare with me
    .definitely, NOT definately ......separate, NOT seperate
    should have, NOT should of
    .....guaranteed, NOT guarenteed
  • danrv
    danrv Posts: 1,379
    First Anniversary First Post Name Dropper
    Forumite
    grumbler said:
    With an overlap you have to seal  it reliably.

    For solid wood planks on a concrete slab I used blue DPM from BnQ (plus thin underlay). 
    SF sell similar 3x4m black one - https://www.screwfix.com/p/capital-valley-plastics-ltd-damp-proof-membrane-black-1000ga-3m-x-4m/50464 
    Not sure if it's any different for LVT, but, if needed, you you can heat the membrane a little with a hair drier or a heat gun to make is softer when laying the planks.
    That might do if less than 1mm thick.
    There won't be much water getting onto the tiles but it's an extra barrier.
    Will need to stick in place around the edges.
  • grumbler
    grumbler Posts: 58,605
    Name Dropper First Post Photogenic First Anniversary
    Forumite
    edited 17 November 2023 at 1:16PM
    It's definitely thinner than 1mm, but, possibly,  some wrinkles will be difficult to avoid.
    We are born naked, wet and hungry...Then things get worse. :(

    .withdrawal, NOT withdrawel ..bear with me, NOT bare with me
    .definitely, NOT definately ......separate, NOT seperate
    should have, NOT should of
    .....guaranteed, NOT guarenteed
  • danrv
    danrv Posts: 1,379
    First Anniversary First Post Name Dropper
    Forumite
    edited 1 December 2023 at 4:51PM
    The builders's membrane has fitted in well and it's turned up around 20mm at the edge. 
    I take it that the LVT floor tiles would go close to the edges and then skirting board on top.


Meet your Ambassadors

Categories

  • All Categories
  • 341.6K Banking & Borrowing
  • 249.7K Reduce Debt & Boost Income
  • 449.1K Spending & Discounts
  • 233.7K Work, Benefits & Business
  • 605.6K Mortgages, Homes & Bills
  • 172.4K Life & Family
  • 246.7K Travel & Transport
  • 1.5M Hobbies & Leisure
  • 15.8K Discuss & Feedback
  • 15.1K Coronavirus Support Boards