Best way to seal concrete [Roof] lid

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Old 01-13-13, 04:20 PM
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Best way to seal concrete [Roof] lid

I have a detached 2 car garage. The garage is mid level and made of concrete. Right now the garage has just the bare flat concrete lid to it. what is the best way to seal it so the inside stays dry and the lid repels the water that we famously get out here in the PNW.

I do want to tar the roof.
 

Last edited by ray2047; 01-14-13 at 10:57 AM. Reason: Clarify title.
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Old 01-14-13, 06:06 AM
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Welcome to the forums!

I'm not sure that I understand the question Is it a flat concrete roof over the garage?
A pic or two might help us better understand. http://www.doityourself.com/forum/el...-pictures.html
 
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Old 01-14-13, 09:52 AM
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These pics are taken from me standing on top of the garage. This deck is about 30" above the house grade, therefore making it a very attractive place to make a front deck.

I am currently in the process of removing the old crappy topping slab that was placed years ago by the previous owner. The deck below the topping slab is a nice and smooth concrete, that I will pressure wash once the entire topping slab is gone.

So the problem is, since the deck is flat(ish) water soaks through and gets into the garage below. Creating a wet garage interior.

I want to have a dry garage.

My plans are the build a small pitched roof (built up between 2" - 4" and slope it all to one side and then build a patio deck on top of that.





 
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Old 01-14-13, 03:48 PM
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I would suggest placing treated 2x6 wood blocks (2 to 4 depending on the pitch you want to get) along the perimeter on three sides and using tappered polyisocyanurate insulation and a 60 mil thick EPDM rubber roof over the top of that. Run the rubber over the edge of the 2x6 and cover it with a "gravel-stop" type of fascia. Carlisle or Firestone have good details on their websites to show the typical details.

If you want to cover the roof with a deck of some type I might pay the extra for a 115 mil thick fleec-backed EPDM because it has more puncture resistance and is considered by some to be easier to adhere (glue) in place.

That may be more work and material than you are hoping for but most other solutions will have a very limited life and you don't want to pull the deck off every 2-4 years to reapply a water-proofing that does not last. That is just my opinion, maybe there is a better way in your area.
 
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Old 01-14-13, 10:30 PM
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Awesome!
That is pretty much what I was planning to do.. but the question I'm asking is geared for the actual concrete deck.
 
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