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Foil / bubble wrap insulation

Discussion in 'Home Power and Microgeneration' started by gareth, Nov 10, 2004.

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  1. gareth

    gareth Guest

    I've just bought a roll of foil / bubblewrap to use in my attic - its going
    between the plasterboard and a 2ft thick stone wall. I was going to put the
    shiny foil side facing in - however the instruction give a different story;

    Roof insulation - foil inside unless using plasterboard then foil on
    Wall - foil outside
    Floor - foil on top unless using insulation then foil go's on outside.

    I thought the foil would always go on the hot side - facing inside to
    reflect radiant heat in?

  2. m Ransley

    m Ransley Guest

    Do you have an R value for the product, Ive seen what you describe and
    believe it is not worth the expense. R 7.2" foamboard followed by R 5.5
    foamboard lastly R 3.5 fiberglass are your best bets
  3. gareth

    gareth Guest

    I don't know the exact values but it claims to be "equivalent to 55mm
    Polystyrene" I know exactly what you mean about the cost, an 8m x 600mm roll
    was £12. I'm using it to repair an area of the wall, at some point the gap
    behind the plaster has been filled with a blown insulation. The patch I'm
    working on has already been replastered but they removed the insulation
    behind (or it fell out) and it was causing a cold spot with occasional
    condensation during really cold spells.
  4. I think it's probably because the foil serves as a vapor barrier, not
    just a heat reflector.

  5. m II

    m II Guest

    I think it would depend on whether you wanted to keep heat out or in.
    In a warm climate, you want the shiny stuff facing toward the roof, to
    keep the rooms below cooler. If in a really cold climate, shiny side
    goes down.

    There has to be an airspace next to the shiny side in order for it to
    reflect anything back.

    # Insulation for houses and tents in a cold environment. A sheet of
    mylar covers the inner wall of the house or tent, with the shiny
    surface facing inward. This reflects body heat back into the house or
    tent, warming the interior more efficiently.
    # Insulation for houses and tents in a hot environment. A sheet of
    mylar covers the outside wall of the house or tent, with the shiny
    surface facing outward. This reflects the sun's heat away from the
    house or tent, cooling the interior more efficiently.

  6. Guest

    I don't think it matters, for heatflow, but facing it down keeps it
    from accumulating dust, which can prevent it from working.

  7. m II

    m II Guest

    Dust is not our friend. I don't care HOW cute dust bunnies are.

  8. News

    News Guest

    Does it make any difference to the thermal performance of the house?
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