I want to put down some black polythene under my house as a moisture barrier. The ground is a little damp. Is there any particular black polythene to use ? I read construction grade 6mm. Is this correct ? Thanks
trade4us2,
Oct 18, 2:46am
6mm is very very thick!
fxx99,
Oct 18, 2:56am
What is good to use then ?
chrs
tweake,
Oct 18, 3:02am
most shops will know what you want.
make sure you sort the drainage first. if its damp then its either go little air flow or poor drainage. the ground under the house needs to be slightly higher than outside the house. you will need some pins to pin it down to the ground otherwise it will lift up when the wind blows. the pins will also be drain holes, you can make more holes, in case any water gets blown under or a pipe leaks. obviously if your ground is to low it will fill up with water rather than drain away. don't forget the good tape. measure and cut to size outside, then drag it under.
survivalkiwi,
Oct 18, 3:04am
250mu they come in rolls that are 4m wide by either 25 or 50 meter.
trade4us2,
Oct 18, 3:22am
That's 0.25mm thick. I imagine that would be OK.
kwm30,
Oct 18, 4:36am
This is exactly how under my house looks, don't forget to tape up around your piles. just as the picture shows.
tweake,
Oct 18, 9:38am
tho i would go up the piles a lot more. wrap the piles first then you don't have to be so accurate on cutting around them. also go up the outside edge. that helps stops rain from being blown in. just don't cover up the vents.
Use Dpm 250 micron, but it is far more important that you have addressed everything else . like clear vents , drainage , paths falling away et etc
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