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
Can anyone be any help?
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.
I've done this using a removable 'Pallet' system.
The deck was set on the roof in 4x4 foot pallets using simple thick roofing
felt/ treated lumber pads underneath.
Each pallet was 2x4 treated, decked with treated 5/4 1x6 with 2 boards left out
leaving gaps in the deck at 1/3 and 2/3 of each pallet. After setting the
pallets in place LONG 16 foot boards were dropped into the 2 spaces tying 4
pallets to each other. The deck was 12 x 16 . along the 12 foot sides a 12 foot
fascia board tied the 3 sections together. Steel railings were bolted on top.
The intention was to remove this deck if the tar/gravel ever leaked. That was 15
years ago and the deck is still there and the roof is still leak free.
They did remove a few boards to be able to add a bit more felt in areas that
started to bounce a bit, but that was 10 years ago.
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.
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
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
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.
On 9 May 2006 11:06:34 -0700, " email@example.com"
This is very common in NYC. I don't know how that helps you but maybe
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.
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