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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorarchess200
    • CommentTimeJun 11th 2017
    The woven root barriers available do not seem to do the job: I still get dandelions - one of the worst to get out - rooting through the black poly...... weave. Any other options used that would do the job completely. What about 1000g DPM polythene layer with a few punctures for drainage? I have used fleece on a different project and tried to screw through the material, but it is very very difficult: the fibres stop the screw. Any suggestions as to whether it would do the same for roots?
    • CommentAuthorowlman
    • CommentTimeJun 11th 2017
    I doubt there is any long term solution,- lots of temporary ones. Once a build up of soil, leaf litter, accumulates on top of the barrier it allows seedlings to establish and if not removed PDQ they will send deep roots down looking for nutrients. I've put the stuff you refer to on paths between raised beds and covered it with wood chippings, probably the wrong thing but it looks nice. The paths eventually succumb to weeds though. Constant weeding may be the only remedy and accept that the barrier makes that job easier if done regularly, or Roundup,- but not for me.
    • CommentAuthorskyewright
    • CommentTimeJun 12th 2017
    Agree with all that owlman writes.

    I've found that 2 layers of woven is better (I think more that twice a s good?) as 1 layer. Especially where it's used on it's own as a temporary cover (e.g. over a season or 2) I think it may be that that the slight differential movement between the layers helps?

    Even with 2 layer & wood chippings between raised beds I find that it's necessary to sweep/shovel the chippings off & pull up the membrane every 2-3 years to really disturb things. If the used membrane is clogged up with roots, etc., I roll it up & put it in a dark place for a year or so (& either put the chippings in the compost or use as mulch) . By the time I come to look at the rolled up membrane again the roots, etc., have been eaten, rotted, or easily pull off & I can use the membrane again...
    • CommentAuthorbarney
    • CommentTimeJun 12th 2017
    I've a section at the top of the garden that's covered by a Mypex product - it's been down about 4 years and nothing comes through it - it covered an area that had brambles and buddleia growing along with plenty dandelions

    In odd areas where leaf debris etc collect, weeds do grow there - and around slits I put in to plant a few trees - for the debris growing weeds I just remove them with a stiff brush - a spot of roundup clears anything around the trees

    I'm going to lift it this early autumn to put down grass seed

    I think there are "membranes" and there are "membranes" - some of the cheaper stuff looks particularly open weave by first observation

    Total agree with a double layer of Mypex - not much comes through it - but plenty will grow on top of it

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