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EPS insullation for an attic?

  • 05-12-2015 11:37pm
    #1
    cubix
    Registered Users, Registered Users 2 Posts: 2,163 ✭✭✭


    Anyone use EPS for their attic, was going to use it in sections directly onto ceiling joists where walk access is needed and to the rest of the attic with a topup 200mm fibre jobby. I think the normal kingspan ridged type is normally twice as good as the fibre stuff, 100mm=200mm? IF so has does this stuff compare.

    The reason Im thinking of this stuff is the normal kingspan 100mm is €40 for an 8x4 which is nearly 3mtr sq


    Product description: Graphite enhanced polystyrene boards with excellent U-Values of 0.029 W/mK to 0.033W/mK. Our boards are lightweight and easy to work with.

    Applications: EPS boards are perfect for thermal insulation of your attic,interior walls,ceilings and underfloor.Our boards are also designed to be used in an Exterior Wall Insulation system with a choice of silicone or acrylic finish with a wide range of colours available.

    Dimensions and packaging: Graphite enhanced polystyrene boards are produced as plain boards with dimensions of 1m x 500 mm up to 1m x 3m for large areas. Boards can be cut from 10mm to 500mm thickness.

    Our sample prices :
    100 mm of STANDARD- U-Value 0,032-0,033 - € 5.50 per m2 + VAT
    100 mm of PREMIUM U- Value 0,31 Wm/K - €7.90 per m2 + VAT
    100 mm of DIAMOND U-Value 0,029-0,030- €8.40 per m2 + VAT

    Price per pack of STANDARD (3m2)- €16.50 + VAT
    Price per pack of PREMIUM (3m2)- €23.70 + VAT
    Price per pack of DIAMOND (3m2)- €25.20 + VAT


Comments

  • #2
    whizbang
    Registered Users, Registered Users 2 Posts: 2,023 ✭✭✭whizbang


    EPS is very good insulation wise, but it has a very low compression strength. i.e. it will break if you walk on it.

    XPS is better, Polyiso seems to be the best.

    Standard loftwalk stuff is what you are looking at, but I am dubious at using this as over time the foam will get compressed where it meets the joists.

    I have thought of doing this myself, but it would require something like 10mm ply sheeting glued to both sides to be strong enough to walk on.

    Having said that, i believe its excellent stuff for attics, as its insulation value is not dependent on the howling gales blowing through my attic. Fiberglass can be utterly useless in this regard.


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