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Roofing: Waterproof second story balcony ?

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Roofing: Waterproof second story balcony ?

Old 08-16-2016, 06:24 AM
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Default Roofing: Waterproof second story balcony ?

Looking for some input from the roofers here. We will be building a house with a second story balcony directly above the front door. Balcony will get quite a bit of use and will have your typical patio table and chairs. It needs to be a durable and waterproof floor. We did find Duradek but no installers in our area but does look like a good product. We are thinking something like s PVC membrane with no or few seams since that is the weak link. Looks like material is sold in rolls. Balcony is 16' x 20'. Here's a pic to give you a general idea. Def need something that is cool to the touch for bare feet and UV resistant etc. Suggestions ?

We are in Pensacola.
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Old 08-16-2016, 07:03 AM
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You pretty much have to have 2 layers..the real waterproofing and a walk surface on top of it.
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Old 08-16-2016, 07:05 AM
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Think of it this way; you are putting a deck over a roof. So have it engineered with that in mind. Once you have your roof done (it will need just a little pitch away from the house) the sub-rafters to take the pitch out to install the floor material. any good contractor could do this. I think there was an episode on this old house that they did just what you are wanting to do.

OR, what Billinstuart said ^^^^^^^^^^
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Old 08-16-2016, 07:10 AM
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Originally Posted by Badbagger View Post
Looking for some input from the roofers here. We will be building a house with a second story balcony directly above the front door. Balcony will get quite a bit of use and will have your typical patio table and chairs. It needs to be a durable and waterproof floor. We did find Duradek but no installers in our area but does look like a good product. We are thinking something like s PVC membrane with no or few seams since that is the weak link. Looks like material is sold in rolls. Balcony is 16' x 20'. Here's a pic to give you a general idea. Def need something that is cool to the touch for bare feet and UV resistant etc. Suggestions ?

We are in Pensacola.
Vulkem coating. We install thousands of sq ft on multi million dollar homes throughout florida. You can do decks, tile, pavers anything you want on top or leave the top coat with sand finish.
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Old 08-16-2016, 07:25 AM
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If the deck is already under a roof how hot do you expect it to get if it is shaded by the roof above it? I also question the need for an absolutely waterproof roofdeck when only a driving rain will result in some seepage to the first level. you also have pitch and flashing issues to address as you do not want the wind driven rain to back up into the sheathing or house.


We are addressing a similar situation with a cantilevered deck over my garage that I want to make the area under the garage drier during heavy rain (I roll my grill out under it to cook). we are sistering deck boards against the joists underneath with a slight pitch away from the house and are then using pvc sheets screwed into the deck board edges with an adhesive sealant on the edges.


We expect it to be nearly 100% waterproof and do not care about an occasional drip. Will also make a nice underside finish to the deck above impervious to rot. The only issue is the runoff will be along the front which we do not care about. In your case, you would want to have a concealed gutter that pitches to the right of the door in your picture and drains at the end with a concealed downspout or simply drains off to the side of the entry. You will not be getting all that much water due to the roof above.


That's my suggestion for something clean and simple.
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Old 08-16-2016, 07:56 AM
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Generally a commercial water proffer / roofer is going to be more knowledgeable about that kind of work. If you have a finished ceiling below even a small leak will become a big problem.
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Old 08-16-2016, 08:49 AM
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Thanks much for the suggestions. House basically sits on North side of Innerarity Island and maybe 100 yds off the bay where there can be a strong wind out of the North and driving rains when weather turns. Will keep reading and check with contractors during the bid process for the house.
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