My PixInsight Tutorial
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Rural central lower Michigan
CG5ASGT Astro-Tech AT6RC Zhumell 10 inch dob deluxe kit 10x12 observatory Echo Astronomy maker of Custom bahtinov masks and Duncan collimation masks.
Quote:Move the door to the north end, patio stone on packed sand works. Pour just a pad for the dob. then rebuild your south wall for full drop down. Carol solved the side leaks with garage door weather strip.
12.5 " F5.6 Homemade Dob , mirror ground and figured by myself 10 " F4.0 LXD55 Meade 6" F8 Homemade Dob , mirror ground and figured by myself , Sears 60mm x 900mm Refractor
Quote:Not sure how tall your walls are but if they are tall enough an option might be, pour a pad for Dob, use 2x8 pressure treated floor joists and plywood floor isolated from padNorm
Quote: where the rocker box sits bare dirt.
Quote: Unfortunately, the walls are only about 6' tall
Quote: Quote: where the rocker box sits bare dirt.
I would never leave my dob on bare dirt. Moisture, plus mice, etc., finding their way in.
Quote: Unfortunately, the walls are only about 6' tall
That seems very high for a dob. My dobservatory has 3' high walls for my 16", to get as low to the horizon as possible.
Here is how I sealed the spacing between the roof & the walls, as Mary mentioned. I've never had any moisture whatsoever, even with my usual storms of "sideways" snow & rain storms. This is just garage door bottom stripping that I think comes in 9' lengths. I just stapled it on the top of the walls.
Black Creek Observatory C11 EdgeHD C8 AT6RC Eon80mmED
Quote:I did the same,but even had to have mine transported. In the end, not much was left of the original, and I wasted a lot of time stripping old stuff off. It was probably a bad idea.Here's the thread......http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5027475/page...
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html
Quote:Aahh I was never much of one for throwing good money after bad. Start over and do it right. Mike
Quote:I don't know how long it's been since you built it but for an on grade unpainted structure it's still standing which says something for the initial build skills! If the roof rolls smoothly and the walls aren't racked I'd consider refurbishing it rather than starting over.
The roof is the priority, I wouldn't do just the half that's failed but the whole thing. The corrugated metal is lighter than plywood and shingles and easier for one person to handle. You know now how to do it correctly so I'd just redo the whole roof. If any of the rafters seem a bit ratty you can sister new ones along side and screw the new roof into the sistered rafters. Replace the plywood gable ends with T-11 sheathing and prime and paint them. If you're going to move the door to the other end consider redoing the framing and use a pre hung door. It will make for a stronger wall. Since you say your carpentry skills are a bit iffy this is something I'd hire a finish carpenter for. He can cut and size the door to fit and make sure it's square. Replace the sheathing at that end with T-11 and prime and paint it and the door.
Before you reframe the other end, that is now without the door, do what ever "floor" work you're going to do. If you dont want to pour a slab for the Dob consider one of those pre cast units they use to set A/C units on. You can do the rest in pavers, just leave a gap so they don't touch the base for the Dob. Reframe and resheath the end wall with T-11, prime
As money and time permit you can resheath the side walls with T-11 and prime and paint them as well. Correct the grade around the Obs so that water from the roof and surrounding area is directed away from the walls. If you know what a French Drain is this would be a good idea for around the perimeter. An 18 inch gravel border around the Obs will keep mud and water from splashing up on the walls. Apply a waterproof coating to the bottom 18" of the walls as well as 18" metal flashing.
If you feel your skills are up to ir make and install some corner shelving out of MDF. You can make a desk, some storage, eye piece racks etc. These will help keep the corners square as well as providing you with useful areas. Use hefty angle brackets to tie the top and bottom corners of the walls to each other. Sister any weak or iffy wall studs. Use Carols garage door weather stripping trick to keep out wind, rain and tiny UFO's.
Hope this helps.
"Another new world, no beer, no women, no pool parlors, nothing to do here but to throw rocks at tin cans and we have to bring our own tin cans." Earl Holliman (Cookie)- Forbidden Planet
Quote:Quote:Aahh I was never much of one for throwing good money after bad. Start over and do it right. Mike Well, at least you didn't suggest possible termites this time.....
NW Mass, inches from Vermont
(well....it used to say that.....)
Quote:To seal the edges of your roof, you can get at real lumber yards (or they can order for you) metal roofing parts called gable trim. They are more for the newer roofing with a ridge every 9", but will work on corrugated. They are made to cover about 4" of the roof, and hang down about 4". If you look at photos of observatories that BYO build, they normally use this edge trim.R
Quote:I already feel confident enough with these changes to leave my C6-RGT out in the shed with a big garbage bag over it. I'm still reluctant to put the 20" out there during rain until I see how things go. It will probably be OK once I get a pad of some sort under where it goes.I do have a question for you other Dob owners. How do you protect your secondary when you leave it in a observatory? I wasn't doing so but I really would rather have some kind of simple protection on it. But it has to come on and off easily, and I need to be sure I don't end up damaging the secondary doing so, or changing the collimation.