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Building a wood shed, vapor barrier???

Discussion in 'Our Firewood Forum' started by redoakneck, Oct 22, 2018.

  1. redoakneck

    redoakneck Pinnacle OPE Member

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    I'm building a wood / hay IMG_20181022_133959217.jpg shed and using metal for the roof, will be open on at least 2 sides, 11'-8' feet tall.

    Is a vapor barrier needed??? Does it protect the metal from treated lumber???
     
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  2. Deets066

    Deets066 AKA Deetsey

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  3. RI Chevy

    RI Chevy Stihl Runner

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    I have never used a vapor barrier in that instance.
    Wind running through it should keep it dry.
     
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  4. redoakneck

    redoakneck Pinnacle OPE Member

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    Thanks, kinda what I thought since not a heated or ac building, just didn't want to see the metal get messed up from pressure treated wood . I know that I don't need pressure treated wood because it should stay pretty dry under the roof, but I have those wood/ carpenter bees that invade soft pine pretty bad
     
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  5. Deets066

    Deets066 AKA Deetsey

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    Painted or alumagalv sheets last a long damn time
     
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  6. RI Chevy

    RI Chevy Stihl Runner

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    You could always put some stainless washers between the metal roofing and the wood. It would provide a little protection. Piece of mind for you.
     
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  7. JohnnyBlade

    JohnnyBlade JUST GONNA SEND IT

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    Never heard of this....what does treated wood do to painted metal? Ive been attaching steel electrical enclosures, panels and meters to treated wood for 20 years...
     
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  8. paragonbuilder

    paragonbuilder Jon1212 Approved!

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    They condensate anyhow.
     
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  9. paragonbuilder

    paragonbuilder Jon1212 Approved!

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    If you are concerned, buy a couple rolls of zip system tape and tape the top of your purlins.
    And make sure your screws are rated for treated lumber.
     
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  10. redoakneck

    redoakneck Pinnacle OPE Member

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    I have no idea, sounds like it isn't an issue???
     
  11. Dustin4185

    Dustin4185 Pinnacle OPE Member

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    The screws not being rated for ACQ lumber would be a greater concern than the painted metal to treated lumber issue. FWIW, the treated wood I used for facia boards on a small shed are getting eat up by carpenter bees as well. Also your dead load weights will be greater with treated. I would use #2 pine for everything except posts and bottom wall purlins if you are siding it.
     
  12. Deets066

    Deets066 AKA Deetsey

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    Sounds like he’s using plywood, then sheets.

    If you wanted, felt paper is cheap
     
  13. paragonbuilder

    paragonbuilder Jon1212 Approved!

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    I must have missed that. Yup if plywood is used felt is the easy answer
     
  14. paragonbuilder

    paragonbuilder Jon1212 Approved!

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    It’s really not, they sell painted steel deck ledger flashing and it holds up fine.
    Personally I use copper. But painted steel does work.
     
  15. JohnnyBlade

    JohnnyBlade JUST GONNA SEND IT

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    X2 what he said. All else fails use flexseal. Im mean they put a screen door in the bottom of a boat.........it has to work:D
     
  16. Homemade

    Homemade Pinnacle OPE Member

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    The chemicals used in the pressure treating process cause accelerated corrosion on steel members. You can’t avoid the raw steel even if it’s painted or galvanized from contacting the pressure treated lumber, because you puncture the steel when fastening. Those are the facts.

    Now for my opinion. Don’t worry about it. I don’t think it will be much concern. If you invest in any moisture barrier, I would put in on the ground and burry it with 4” of stone to keep it from rotting the bottom row.
     
  17. redoakneck

    redoakneck Pinnacle OPE Member

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    Wasn't going to use any plywood, steel roof on 2x4 horizontal pressure treated .

    Thanks for the tip on special pressure treated wood screws!!!
     
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  18. huskihl

    huskihl Sausage Fingers Forever

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    It'll be fine. Steel polebarn siding is screwed to a treated bottom skirt board on most pole barns. I've never seen an issue
     
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  19. RI Chevy

    RI Chevy Stihl Runner

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    Just use a stainless steel washer between the steel roofing and the PT wood.
     
  20. Deets066

    Deets066 AKA Deetsey

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    That would be a pain in the asss and wouldnt keep the entire sheet off the wood anyway.
     
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