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#1
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Floating a deck on a flat roof
Ok, I have a great flat roof that would make an Awesome deck, it's got
a great view and once we put a dormer and french door in, we will be golden. I heard tat this Old House "Floated" a deck over a roof. Does anyone know how this works? We have to get the roof re-done at some point, so if i'm going ot have to tie things in i'd rather do it then. I als might make it so it is easy to access under the deck, just incase. Can anyone be any help? Thanks, Adam |
#2
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Floating a deck on a flat roof
I think they did a conventional rubber membrane roof and placed special pads
down on the roof that the deck sections rested on. I don't think any roofer would give you any warranty at all if you wanted to put any kind of tie in that would penetrate the membrane to attach the deck to the roof. I don't think any amount of flashing and sealant would keep your roof leak free. " wrote in message oups.com... Ok, I have a great flat roof that would make an Awesome deck, it's got a great view and once we put a dormer and french door in, we will be golden. I heard tat this Old House "Floated" a deck over a roof. Does anyone know how this works? We have to get the roof re-done at some point, so if i'm going ot have to tie things in i'd rather do it then. I als might make it so it is easy to access under the deck, just incase. Can anyone be any help? Thanks, Adam |
#3
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Floating a deck on a flat roof
My only question is what happens in a VERY strong wind / Hurricane. Is
there any chance it would blow-off, etc/ it's in a fairly sheltered area, back side of a LARGE roof, and i think any big hurricane would come from teh south / east which would be protected.. I coudl some how "bolt" it to the house. Thanks |
#4
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Floating a deck on a flat roof
There are some other issues associated with putting a deck on a roof.
Even a "flat" roof is sloped slightly so it will drain. You'll have to allow the new deck to follow the roof slope or shim the support points to level the deck. Don't place members on the deck that could dam or otherwise obstruct water flow as water could build up and flood the roof. Water weighs a lot and it is common to collaspe roofs if the water builds up. The added weight of the deck will also make the roof sag a little more and potentially increase the ponding effect (and load). Additionally, depending on where you live, a roof is not sized to take the additional load of a deck and the added people/furniture associated with the deck. Typically, a roof is designed for 12 to 20 pounds per square foot additional live load (not including the existing material load). A deck could weigh 10 psf plus the live load of 40 psf, well you can quickly overload the roof. If the roof was designed for a heavy snow load, then the 40 psf live load won't be there when the big snow hits. Lastly, high winds actually try to lift up items off a roof, especially around the edges and corners. Not tieing down the deck could damage the roof during high winds and cause a public hazard if it actually clears the roof parapet. You may want to contact a local structural engineer is address the load capacities of your roof before preceeding. Paul. |
#5
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Floating a deck on a flat roof
On 9 May 2006 11:06:34 -0700, "
wrote: Ok, I have a great flat roof that would make an Awesome deck, it's got a great view and once we put a dormer and french door in, we will be golden. I heard tat this Old House "Floated" a deck over a roof. Does anyone know how this works? We have to get the roof re-done at some point, so if i'm going ot have to tie things in i'd rather do it then. I als might make it so it is easy to access under the deck, just incase. Can anyone be any help? This is very common in NYC. I don't know how that helps you but maybe it will. A friend's 3-story 20 aparment building had a deck on the roof with wooden lawn furniture, electricity, etc., and the roof door was unlocked so that anyone could go up there. But aiui someone was actually paying rent for the roof and others didn't use it, at least not when the tenants wanted to. My friend never used it, but she burned in the sun, so maybe that was why. A lot of buildings from private homes to large apartment buildings have roof decks. Thanks, Adam |
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