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What Insulation should I use

  • 14-08-2023 10:53PM
    #1
    One shot on kill
    Registered Users, Registered Users 2 Posts: 2,248 ✭✭✭


    Hey Guys,

    Thanks for taking the time to read over this.


    My current house has Styrofoam insulation with the cavities pumped with beads.

    I'm currently building a flat roof an extention to the back.

    100mm kingspan in the floors

    80mm cavity insulation in the walls.

    Roof is a cold roof construction with fibreglass finish.

    My question is if I use 8inch rock wool insulation between the joists do I need and insulated slab also.

    Then what size insulated board should I put on the walls.


    People tell me 62mm on the ceilings with the 8 inch rockwool and 37mm on the walls.

    Or 37mm on both ceilings and walls.

    Or 37 on ceiling with the 8inch rock wool and 62 on walls.


    Please could I ask for some guidance on this.

    Much appreciated.



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