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do you worry about a roll off roof blowing off?

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#1 elbee

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Posted 10 December 2013 - 01:47 AM

curious to know what you do to make sure that doesn't happen.

thanks

#2 astrodog73

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Posted 10 December 2013 - 02:34 AM

I fashioned some interlocks out of some steel angle and RHS sections to stop uplift.... then one bolt through the wall top plate into the roof frame stops any rolling action....

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#3 astrodog73

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Posted 10 December 2013 - 02:35 AM

Another pic....

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#4 Galaxyhunter

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Posted 10 December 2013 - 06:52 AM

Here is how I did mine, A rod is welded on the end stop that fits above the casters on the South end when closed.

Then on the North Side I have a pin that locks into a plate bolted to the side of the building.
This is a no muss, no fuss system that allows me to run my Observatory remotely without worrying about manually locking the roof down.

#5 scopefreak

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Posted 10 December 2013 - 08:27 AM

My OBS has been in use for almost four years and i just use a simple turnbuckle system to keep the roof on when closed. This is not a remote controlled OBS so I have to remove and replace the turnbuckles before and after each session. Takes about a minute to do.

I do not have the turnbuckles on the gantry so if the wind is much above 25mph I will close down or don't open it due to the possibility of the roof blowing off when in the open position. I am probably being paranoid about this as the roof weighs about 2000 pounds, but better safe than sorry! :o

#6 David Pavlich

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Posted 10 December 2013 - 08:55 AM

I went the low tech route. All I did was used eye bolts in the roof and floor and used tie down straps. I also have 4 eye bolt/turnbuckle combinations at the corners. I added the straps before one on the hurricanes came wading ashore. :grin: The roof never left the structure.

Edit: They are all through bolted with nuts and washers, not lag type eye bolts for the strap versions.

David

#7 csa/montana

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Posted 10 December 2013 - 10:28 AM

Nope, not worried at all, mine has turnbuckles to hold it down.

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#8 Starman27

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Posted 10 December 2013 - 10:43 AM

I also use turnbuckles. The roof stayed on when it was hit by a microburst but the unit was damaged as can be seen in this image. It has also survived a F0 tornado that damaged a lot of trees.

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#9 thesungazer

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Posted 10 December 2013 - 10:47 AM

Nothing at all. Standard garage door rails and rollers held up fine in 80mph Derecho wind gusts.

Greg

#10 Norm Meyer

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Posted 10 December 2013 - 11:13 AM

I use bar clamps. They work well. If we're expecting
really high winds (hurricane, blizzard etc) I add a couple
of heavy duty "C" clamps. The obs has been there for about
5 years and haven't had problems.

Regards Norm

#11 Footbag

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Posted 10 December 2013 - 11:30 AM

I've been using clamps, but I just ordered a set of turnbuckles. I'm not really worried unless we get a hurricane, but I do need something in that event.

#12 kolsen

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Posted 10 December 2013 - 11:54 AM

Turnbuckles. I've tried other types of clamps but the turnbuckles are the easiest and safest.

I do like your idea Galaxyhunter. I might have to do that for my new roll-off this spring!!

#13 pstarr

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Posted 10 December 2013 - 11:59 AM

I use four 1/2" threaded rods that attach to 1-1/2" angle iron brackets. I haven't had a problem since I built it in 1991.

#14 Old Dinosaur

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Posted 10 December 2013 - 12:09 PM

Ratchet tie down straps at each corner attached to 3/8" hooks and eyes.
Out here in Wyoming the breeze will blow you away.

#15 Midnight Dan

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Posted 10 December 2013 - 01:45 PM

I have a Skyshed POD which has metal brackets that keep the dome from blowing off.

BUT ... if I had an ROR, I'd probably use toggle clamps. You can latch them very quickly, they're inexpensive, and hold a lot. These have a 700 pound holding capacity and are only $6.50 each. Two of them on a side (three for a larger ROR) should be pretty secure.
http://www.thetoggle...re.com/431.html

-Dan

#16 DeanS

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Posted 10 December 2013 - 03:09 PM

I use clamps for now. Have a set of small load binders I was going to use, but after about 8 years of hanging on the wall I doubt I will ever get around to installing them ;)

But I have a incorporated a little detail in my roller system that will not allow the roof to ever come off anyways, but I suppose it could move up and down a little bit if not clamped.

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#17 DeanS

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Posted 10 December 2013 - 03:12 PM

Here is a picture of it during construction. It is the entire length of the roof on both sides, and was covered by the facia trim.

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#18 elbee

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Posted 10 December 2013 - 05:27 PM

great suggestions, all! thanks very much.

Dean -- i like your solution a lot -- a design that in general shouldn't ever allow it to lift off (under normal wind conditions) combined with the various turnbuckle, tie-down methods others have incorporated for a severe weather event.

did you extend the capture system (top plate on the support beam) to include the support rail extensions outside the observatory so it remains captive even in the open position?

i'm hoping to take something to my HOA in the near future. keeping my fingers crossed i can present a project plan that will pass their rigorous review process. (aesthetically and functionally).

thanks

#19 jazle

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Posted 11 December 2013 - 08:23 PM

When I had the engineering calcs done on my ROR, they calculated an uplift of about 2000# with 85mph winds. The roof was calculated to weigh 1200# so I had to come up with interlocks that could hold it down in the four corners with 200# each. I use two bolts screwed into the rail and a piece of 1" square stock with a slot cut out one side that slide around the bolt heads when closed. The engineers were satisfied with that mechanism.

Now, that was for 85mph winds. Turns out that our backyard is in a depression with many tall trees on the neighboring properties adding plenty of wind shielding. With my observatory weather station up since April, the maximum gust (not average) we have seen has been 19mph. I think my roof is safe :)

#20 CCD-Freak

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Posted 11 December 2013 - 10:24 PM

Never underestimate the power of moving air!!! I lost the roof of my observatory during a violent Texas thunderstorm. It flew almost 300 feet before it hit a guy wire on a utility pole which sliced through 8 feet of 26 gauge corrugated tin. The building would have blown away too if it had not been for the pier. The roof was held down by 6 turnbuckles and eyebolts which were "ripped out by the roots". Fortunately the scope was with me and not in the observatory.

Make you roof hold down system twice as strong as you might think. You will be glad you did.

CCD-Freak

#21 elbee

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Posted 11 December 2013 - 10:51 PM

I never underestimate the power of wind and water! it is infrequent, but I can get gusts of 40+ mph on occasion.

#22 Stargaz18

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Posted 11 December 2013 - 11:27 PM

I know what you mean CCD! We had 100+ mph winds here with just a thunderstorm. Never seen anything like it except in a hurricane.

#23 1965healy

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Posted 11 December 2013 - 11:43 PM

My ROR has turnbuckles. It's withstood 70 mph gusts with no problem. The Obs is on top of my garage and the peak of the roof is probably 20' above the ground so if it was gonna blow off it would have done it.

#24 BYoesle

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Posted 12 December 2013 - 01:54 PM

I used a rail system similar to Dean's which ensures the roof is always very securely captured in any open position or fully closed.

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#25 astrodog73

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Posted 12 December 2013 - 07:01 PM

If I were building again, I'd incorporate a system like Deans/Bobs - excellent design.... I'd have holes predrilled to slip some long 3/8 or 1/2" bolts through for inclement weather insurance as well....






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