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Think I screwed up...

Discussion in 'DIY Disasters' started by BigJock2005, 23 May 2020.

  1. BigJock2005

    BigJock2005

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    This isn't actually a screw-up yet, but might become one.

    I decided to save money by using type 3 OSB for a decking as it's going to be covered with fake grass so won't be seen. After a bit of reading I thought that type 3 was waterproof rather than just water-resistant, but an experienced mate is telling me no way.

    I've considered sealing it or painting it before the grass goes down, but the grass is porous so the board underneath will get the weather.

    Is the OSB an option at all here, or should I just stop now and swallow the cost of treated timber boards.

    Thanks
     
  2. BigJock2005

    BigJock2005

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    Sorry just to add for clarity, it is Sterling Type 3 OSB from Nordboard.
     
  3. EddieM

    EddieM

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    Oh dear, have a rethink. Stem the oncoming disaster.
     
  4. Johnny Allround

    Johnny Allround

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    I’ve just overboard my brother in law decking used epdm to cover the board and glued the AstroTurf.
     
  5. BigJock2005

    BigJock2005

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    I thought about a large enough piece of epdm to cover the area. That would certainly keep the OSB dry, drier than felt on a roof even.
     
  6. Johnny Allround

    Johnny Allround

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    Yep, and a perfect substrate for the mock grass.
     
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  8. catlad

    catlad

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    Except it could stay wet for a long time if its not got good fall.
     
  9. big-all

    big-all

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    if we completely ignore the wet issue assuming up to 600 centres you would need a minimum 18mm
    what centres and thickness are you planning??
     
  10. Johnny Allround

    Johnny Allround

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    We overboarded using 12mm marineply following the fall of the decking plus 10mm. We put plastic channel drainage for it to fall into and subsequently this falls into a small bucket which he uses to water the plants. The plastic turf we chose can be easily brushed to remove excess water as well. It was the first time either of us had attempted this and we are pleased with the results. Been in place about 6 months and no issues as yet.
     
  11. BigJock2005

    BigJock2005

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    18mm 400mm joist spacing.
     
  12. big-all

    big-all

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    if there is zero damp transfer then the structure should be good to excellent as its engineered with a perhaps 30% -50% redundancy
    but off course as all the strength is in the glue bond any damp will knacker the board if it rises above the level the glue fails
     
  13. BigJock2005

    BigJock2005

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    Yeah that’s my concern. I think it wiuld be strong enough, but after 2 years in all weather I reckon I would start to feel the strength going. And if there’s hot tub on it then won’t be easy to replace.

    I’ve been thinking about buying a workbench recently, think I will carve up to OSD a make one from scratch. That plus a few 2x4s and I reckon I can come up with something ok.
     
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