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  1. #21
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    Default Re: underfloor insulation

    Quote Originally Posted by tweak'e View Post
    explain please. do you mean that the ground cover interfering with ventilation under the floor ? or the ventilation will take away any remaining moisture?
    Both things, Polythene sheet + venting is a good practice to take rising moisture away, out from the subfloor space. Does that make sense?
    "B.M. The government cannot give to anybody anything that the government does not first take from somebody else": The working class! Let's make sure we vote next time!

  2. #22
    tweakedgeek tweak'e's Avatar
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    Default Re: underfloor insulation

    Quote Originally Posted by notechyet View Post
    Both things, Polythene sheet + venting is a good practice to take rising moisture away, out from the subfloor space. Does that make sense?
    perfectly
    Tweak it till it breaks

  3. #23
    Soaring like an Eagle gary67's Avatar
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    Default Re: underfloor insulation

    Having seen and had to fix problems from polythene I wouldn't put it under my house

  4. #24
    tweakedgeek tweak'e's Avatar
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    Default Re: underfloor insulation

    Quote Originally Posted by gary67 View Post
    Having seen and had to fix problems from polythene I wouldn't put it under my house
    what problems and how exactly was it caused?
    Tweak it till it breaks

  5. #25
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    Default Re: underfloor insulation

    Quote Originally Posted by gary67 View Post
    Having seen and had to fix problems from polythene I wouldn't put it under my house
    Gary67
    Please can you explain what the problems were.
    "B.M. The government cannot give to anybody anything that the government does not first take from somebody else": The working class! Let's make sure we vote next time!

  6. #26
    Soaring like an Eagle gary67's Avatar
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    Default Re: underfloor insulation

    Mould created from moisture pooling on the polythene especially round the edges of the house can and has rotted the ends of joists, plates etc.

    In one place I fixed they had a water leak which they didn't know about for ages, this was in Canada (no water meters) the water couldn't escape into the ground.

  7. #27
    Senior Member 1101's Avatar
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    Default Re: underfloor insulation

    What would you recommend for underfloor insulation, for a 1960's ish house where the ground under the house gets wet in winter, especially after hard rain ?

    Solid Foam insulation that gets wedged between joists, or the plastic-wool type of insulation that is just stapled in place ?
    I was thinking the solid foam insulation might help keep some of the dampness out ? Or could it eventually trap the dampness in between foam & floor?

  8. #28
    Senior Member pctek's Avatar
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    Default Re: underfloor insulation

    Quote Originally Posted by 1101 View Post
    What would you recommend for underfloor insulation, for a 1960's ish house where the ground under the house gets wet in winter, especially after hard rain ?
    I recommend fixing the water running under the house problem. Divert it, drain it, whatever is the issue that it gets there in the first place.
    Hot air rises, putting plastic, polystyrene or whatever under your floor is a silly idea, and yes it does hide the pipes and stuff, a right PITA to have your plumber get at things, and yes, will cause water to puddle.

    Solve the problem, not the symptom.
    wipe your paws.

  9. #29
    Senior Member 1101's Avatar
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    Default Re: underfloor insulation

    Ive dug an open drain around the house, that stopped alot of the water issues under the house.
    I'll never stop it all, the area in general has water & drainage issues (North shore clay)

  10. #30
    Systems Engineer Alex B's Avatar
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    Default Re: underfloor insulation

    Bit hard to do when under your house is below the water table @ high tide like a good amount of Dunedin is.

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