Plywood deck over a rubberized roof

Discussion in 'Decks & Patios' started by professional_amateur, Aug 2, 2019.

Help Support House Repair Talk by donating:

  1. Aug 2, 2019 #1

    professional_amateur

    professional_amateur

    professional_amateur

    Spider-Man

    Joined:
    Feb 21, 2017
    Messages:
    7
    Likes Received:
    0
    Hey guys,

    Our master bedroom has a sliding door that walks out to a flat section of roofing. It was obviously planned on being used for a deck but was never finished/built. The roof is covered with rubberized panels. I saw a recent video about using plywood for flooring, and I'm wondering if I could use this as a cheap deck floor.

    My idea would be to purchase enough external plywood to cover the surface, then cut the boards into 8inch slabs. I'd sand the boards and then stagger them to use as the deck flooring. Looking for feedback on this process.

    I'm also wondering if I could simply drill these boards directly to the roof, without using an underlying frame. Framing would add a lot of weight to the roof, and it also would also make it so that you'd need to step up from the sliding door - the roof is pretty much flush with the base of the door jam now.

    Just looking for the cheapest, easiest way to put something down so that we can use the space as a deck. If cutting the plywood into planks doesn't make sense, could we just lay full boards down instead? Most of the area will probably be covered by a large outdoor carpet, and we'd stain/paint the plywood.

    My only other concern is in regards to the rubber matting - would drilling into this cause any issues with moisture potentially seeping into the roof?

    Thanks in advance for any suggestions.
     
  2. Aug 2, 2019 #2

    Snoonyb

    Snoonyb

    Snoonyb

    Well-Known Member

    Joined:
    Sep 30, 2006
    Messages:
    3,703
    Likes Received:
    695
    What living space is under the roof, what is your location?
     
  3. Aug 3, 2019 #3

    mabloodhound

    mabloodhound

    mabloodhound

    Restoration & Renovations

    Joined:
    Jun 22, 2008
    Messages:
    270
    Likes Received:
    76
    Do NOT nail/screw through your rubber membrane! It will leak.
    You need to lay sleepers down (on the flat) and then fasten your deck boards to them.
    Carpet is not a good idea; use boards (like mahogany) and keep them spaced apart so water can drain.
     
    billshack likes this.
  4. Aug 4, 2019 #4

    professional_amateur

    professional_amateur

    professional_amateur

    Spider-Man

    Joined:
    Feb 21, 2017
    Messages:
    7
    Likes Received:
    0
    Thanks for the tip- I was worried about that...

    What do you recommend I use as sleepers? I'll admit I wasn't familiar with the term, but after a quick search, it appears that there are lots of available options (wood, plastic, concrete, etc.). What about using something like pressure-treated 2x2 boards laid parallel to the roof's water drainage?

    In addition, how could I attach these sleepers to the rubber membrane? Or would the weight of the deck boards be enough to hold everything in-place?

    @Snoonyb - the roof is above our mudroom and carport—we can't afford for moisture to seep through.
     
  5. Aug 4, 2019 #5

    Snoonyb

    Snoonyb

    Snoonyb

    Well-Known Member

    Joined:
    Sep 30, 2006
    Messages:
    3,703
    Likes Received:
    695
    Thanks, that and the relative climate zone, will illicit a variety of responses.
     
  6. Aug 4, 2019 #6

    mabloodhound

    mabloodhound

    mabloodhound

    Restoration & Renovations

    Joined:
    Jun 22, 2008
    Messages:
    270
    Likes Received:
    76
    PT 2x would work fine. You want them laid so that they allow water to run off the roof and not act like a dam. You can use construction adhesive to hold them in place. When you nail or screw your top boards on make sure the nail/screw is short enough to not go through the 2x.
     
  7. Aug 4, 2019 #7

    professional_amateur

    professional_amateur

    professional_amateur

    Spider-Man

    Joined:
    Feb 21, 2017
    Messages:
    7
    Likes Received:
    0
    Thanks for the suggestions, they are super helpful. Now I have another issue- the roof was built to drain to one side, which meany deck boards would run perpendicular to the side of the house, which I think would look a bit off. Is there any way I can use the PT 2x sleepers running perpendicular to the drainage direction without causing water to dam? Or what else might you suggest? I've attached a few pics to help articulate.
    20190804_150603.jpg 20190804_150820.jpg
     
  8. Aug 4, 2019 #8

    mabloodhound

    mabloodhound

    mabloodhound

    Restoration & Renovations

    Joined:
    Jun 22, 2008
    Messages:
    270
    Likes Received:
    76
    Personally, I don't think it would look bad. However, you could cut 1/2" deep by 1" wide notches every foot on the underside of each sleeper. But I think that's more work than needed. Lay some boards out on the deck, perpendicular to the house and get a 2nd opinion.
     
  9. Aug 5, 2019 #9

    professional_amateur

    professional_amateur

    professional_amateur

    Spider-Man

    Joined:
    Feb 21, 2017
    Messages:
    7
    Likes Received:
    0
    My wife agrees- she thinks it'll look fine with the boards running perpendicular. I guess I have my answer! Thanks for all the help. I would have made a huge mess of things if I hadn't asked first and started drilling directly into my rubber membrane!
     
  10. Aug 8, 2019 #10

    nealtw

    nealtw

    nealtw

    Contractor retired

    Joined:
    Nov 4, 2010
    Messages:
    24,649
    Likes Received:
    3,329
    Location:
    Chiliwack BC Canada
    You want hand rail that will attach to the sides of the fascia and not thru the roofing material.
     
Tags:

Share This Page