Its finished at last! I finally got the roof on after waiting for weeks for a good day. I wound up going out when it was raining and about 35 degrees. Not the best weather for construction work ...lol. I couldn't wait any longer as we were supposed to have a snow storm that weekend, so I decided to brave the weather and get the roof on. Fun was had by all.
The roof was made using pvc pipe for the frame and covered by sheets of corrugated pvc roofing. the two removable roof sections are about 6'wide and 12' long. The corrugated roof from the one side overlaps the other section so that there is no center seam for rain or snow to get through. The roof sections are slid out and back into a rail on the east and west side of the observatory. I came up with the rail idea when I couldn't figure out a good way to keep the roof in place without using hinges or some other means of securing it, esp. when it gets windy as it often does here. What I wound up doing was using 3 inch pvc pipe(thick wall) and cutting out 1/3rd of the pipe the length of the pipe. It looked like a "C". The 3" diameter pipe is large enough so that with the section removed, I can slide the edge pipe from the frame with the roofing attached right into it so that it makes a rail of sorts. This keeps the roof in place and no wind or rain can get under it at all, esp. since most of my wind comes from the West. The top and bottom of the roof is held in a channel made from the same pvc pipe which was cut in half lengthwise and screwed down so that it looks like a "u" in which the frame pipe rests.( This may be difficult to visualize and its very difficult to explain.........you can see it clearly in the pics form the link I provided below). The roof is secured to the removable 2x6 beams using velcro straps. I am actually amazed at how well its working so far. After two wind storms with gusts over 70mph, the roof hasn't budged! After several days of continuous pouring rain and a couple of snow storms, I haven't gotten any water inside the observatory. Mind you, I used 6 tubes of silicone calk to seal all the seams in the roof as I went along.........I figured , you can never use too much of the stuff but you can certainly use to little.
There are some small things still to finish but I ran out of warm weather...lol. I would like to add some more elctrical outlets inside, as well as a couple light fixtures. A couple drop down work tables would also be nice of course, and I need to finish putting in sealing around the drop wall and a couple ohter places. I have discovered also that while the roof is light enough to remove by 1 person, it is a bit awkward to move around and slide back in place just because the sections are so long
Still, considering my original idea of using 2x6's for the roof frame , I would have to say this is a much lighter way to go...lol. I spent several hours going over different ideas for a workable, removable roof that wouldn't weigh so much that one person couldn't do it, with my brother-in-law and his father when we came up with the idea for using pvc for the frame. I spent days after that trying to come up with a way to attach said roof when I hit upon the idea of the rail . So far its working great! I also want to set something up so that I can use the roof sections to block wind and the lights from the nearby houses when I want to do astrophoto work.
You can check out my other forum posting here to read about the rest of the building if you would like and below is a link to a slideshow I put together. There are links on the slideshow page in the upper right to more pictures than in the slide show also. On the whole it really seems to have turned out great, and there is more room insde than I expected. Now, all I need is some decent weather.
MIke S.