closing in under a deck

[crushers]

so i have this 14X20 deck attached to my garage and i am thinking this would make a wicked parts room.
the concern i have is the "roof", i have looked at the under deck roofing systems and not impressed so i was thinking... yah yah, trouble... why not corragated either fiberglass or steel attached to the joists. there is a beam roughly 8 ft out so the taper will be floor joists at the wall, beam at 8 ft (8" drop) and roughly 14" total drop over 14 ft. 1" per foot is about right, right?
now being corragated the minimal water/snow melt will flow down the lower ribs and out so no water back up.
the end walls will go flush with the deck, roof inbetween outside end walls.
the outside wall will be installed after the "roof" is installed.
this should make a water tight area for storing the parts.

okay, pick the idea apart.

cheers

<or give me some options>

 

[malcb]

I haven't got a clear idea of the plan but it sounds like a space I would want to use.

How would you fix the "roof", I assume you can't get to it from above?

More drop would help in moving debris off the roof, also if your in a humid climate it might be an idea to consider the ventilation under the deck is it doesn't rot.

 

[Zekester]

I live 30 minutes away, my roof has a 14/12 pitch : )

Just do what the other Tara hillbillies do...get a transport trailer, knock off the axles, and leave it in your backyard...instant "shed" : )

 

[crushers]

the planking is 1/4" apart for the deck
there will be 4 "cross bars' that will be used to screw from the bottom into. these will support the sheets.
the moisture content will be extremely limited that can get through the planking on the deck.

my biggest concern is not load since the deck takes the load. it is wasps and their lovely little homes that they fight so viciously to protect.
of course once i figure out how to be able to soak the bastards with easy start then no problem.

ugly fxxxing trailers in the back yard is not acceptable. there will be a cute little shed built for Berni's garden stuff and the riding mower. this is for my car parts that i don't want seen from outside.

 

[archie]

how's snow melt,icing, damming and snow weight in your area? Ontario canada or Ontario california?

 

[Rice]

There are several commercial under-deck roofing systems I think you could replicate without having to go to the expense of purchasing.

e.g. UnderDeck Kits at DIY Home Center


Check out the animation showing how their system works.

 

[scottm]

I've thought about the same. I put seasonal stuff under my deck and cover it tightly with tarps. The roof idea would be tough to keep leaves and pine needles and stuff from clogging, and wasps would love the space. Sheds aren't allowed here, but I'm thinking I'll dig into a steep hill in my backyard and make a bunker for my storage shed.

 

[yooper]

I'd use translucent fiberglass to let the light in. Give yourself some room to clean it from below.

 

[OZCAL]

But then where are you going to sunbathe in the altogether?

 

[agomez]

the space below the decking and the new roof will become a catch all for the crap that falls between the deck boards....I highly recommend a roof over the entire deck and be done with it besides how the hell will you fix a leak once one starts?

 

[crushers]

remember the decking is 1/4" apart so large quanities will not be a concern.
snow load is not a concern since the deck protects the roof from snow load.

the more i think about it the more i am leaning towards a larger gap between the deck and the fiberglass panels. maybe 3-4", this will move anything that might fall through off the roof easier and will allow an attack location for wasps.

i guess a leak could develope but by then i will be bored and want to change things and maybe even the deck itself will be due for an overhaul.

i have looked at the aftermarket below deck roofing and not interested in their ideas... maybe if the support beam was at the outside edge of the deck but it is 4 ft in from the edge.

thanks for the replies guys. i appreciate it.

Ontario Canada

 

[Gold Boy]

dura deck your deck, then you would have a water proof covering to start with...

 

[crushers]

no can do, it is a cedar deck... if i wanted a water tight deck then i would have gone with interlocking vinyl.

of course this is now a "damn, i should have thought this through before i built the deck"
but
hind sight is 20/20

 

[Rookie2]

Friend of mine did something similar to what it sounds like you're doing. IIRC, he installed a gutter along the low end for the runoff to dump into. Seems to me like working out the details to keep the interface between the corrigated deck and perimeter walls watertight, is going to be your biggest challenge.

 

[semlin]

i saw one of these a while ago in whistler that was just plywood sheets with the roll-on roof attached to it but it was hinged with door hinges at the ridge beam and then the outer edge of each sheet of plywood hung under an outer beam by hooks and chain. with the carport empty they could drop one sheet of plywood at a time to hang straight down and get all the pine needles out of the gap. the hinges had some flashing above them and each plywood board had a batton along one edge that overlapped with the next board to seal it. there was also a gutter mounted on the outer posts below the roof end. it actually looked pretty cool and the guy claimed it handled wet coast rains and it rains hard up there.

 

[crushers]

i am thinking "J" channel along the sides to catch the minimal moisture.

 

[Rookie2]

What about the low end.. how you plan to close up between the corrugations and top of that wall?

 

[crushers]

i will not be closing up the low end, the beam is in 4' and with 1"-1' slope, what goes up will come back down...

 

[Zekester]

ugly ****ing trailers in the back yard is not acceptable.

umm I was kidding....

I know you don't want to fit in with your neighbours : )

 

[Awl_TEQ]

Crushers - just came across this thread...

I did just what you are contemplating in my old house in Bridlewood. The deck was 12 x 14 with a decent slope away from the house. I bought some of the fiberglass corrugated roofing in a translucent white at Totem and screwed it to the bottom of the joists. I also got the wood trim they sell with the corrugated shape cut into one side and ran a few strips across so the sheeting wasn't hanging just from the screws. Put a gutter at the low end so there was no drip line in the dirt and covered most of the "floor" with sidewalk pavers. The deck was also skirted in, not air tight but dry and useful storage. As you stated the decking above supports all the load so no troubles with a heavy snowfall. I had no trees nearby the deck so no experience with leaves/ needles. I did have two separate wasp nests in the yard - neither in the deck. Only trouble I had was due to the low ceiling height, about 5', the fiberglass sheeting was fairly fragile and any smack with a shovel handle would crack it. So get sturdy sheeting and go for it