New Roof?


  #1  
Old 04-16-04, 05:15 PM
Cryptic
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New Roof?

I have an interesting situation and was hoping for some advice. I have a flat top roof over a sunroom which has leaking and is in genral disrepair. I am hoping to lay a new roof over top to avoid hassle and time.

The current roof is flat and consists of rolled asphalt. I want to lay 2x4 cut to a slope over 9 feet and lay new 3/4 plywood over top and lay new rolled asphalt over this. I have a few problems that I don't quite know how to answer.

Is there any danger of moisture build up in such a small area?
The sides of the roof have no eavestrough, do I have to slope the edges in for water run off?
Is there a minimum pitch that I have to worry about for run off and the use of rolled asphalt?

Any advise on this would be appreciated.
 
  #2  
Old 04-17-04, 05:28 AM
J
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3/4" ply seems a bit too much to me. If sleepers are at 24", I would think that 5/8" (or 9/16" OSB) would be fine. Technically, you don't need to vent as the old roof acts as a warm side vapor barrier.....I would drill a few bird holes and screem them anyway. The roof drains at the eave, not the sides. Minimum slope of 1/4" per 12'. Personally, I would not trust rolled roofing in this case. I would go with a single sheet of EPDM, glued dowm. I'm sure you can find a local roofer who will cut your piece off of his roll. Some distributors will cut rolls.
Jim
 
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Old 04-17-04, 06:38 AM
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I wouldn't lay a new roof over the old unless you know that the existing roof structure is in good shape. If it's been leaking and is "in general disrepair", there's a good chance you have wood rot.

The amount of slope you need depends on the amount of rain you have. Do you also have to think about snow loads?
 
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Old 04-17-04, 09:46 AM
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With Dave here . Think Id want to check the wood that is up there now first then put on the new wood and ply the way you said.


ED
 
  #5  
Old 04-21-04, 04:43 PM
Cryptic
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Thanks

Thanks for the advice on my roof. I have had opportunity to investigate further and talk to a few contractors. Between the two I now know the best route to take.


Again Thanks
 
 

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