Heads up: Obsy build in March 2014 Astronomy magazine

[Martin Meredith]

3 page article, roll-off, 12' x 8' including warm room.

One notable feature are the kinks in the U-channels that allow the roof to create a snug seal when closed, a nice idea I'll be using when I get around to my own build, eventually...

Martin

[MattGoo]

Which mag? Astronomy Now, Sky at Night, Sky & Telescope?

[Martin Meredith]

None of the above  

Astronomy Magazine

http://www.astronomy.com

[Martin Meredith]

3 page article, roll-off, 12' x 8' including warm room.

One notable feature are the kinks in the U-channels that all the roof to create a snug seal when closed, a nice idea I'll be using when I get around to my own build, eventually...

Martin

I mean allow...

(I don't see an edit option)

[MikeP]

Edited for you.

[laser_jock99]

U-channel also collects water, ice, snow and general crud. I'd think about using just a right angle section with the 'open' side facing outwards. Anything landing in the channel (inc. water) just falls outwards and away.

[Martin Meredith]

True, but I guess the fact that the roof seals itself when in the dips would make crud ingress less likely. The U-section would not be exposed to the elements apart from when the roof is open. 

The principle still holds for the right angle section too as far as I can see, although it could be more difficult to produce the kinks in that profile. As a general idea it seems quite sound to me but it might imply having some kind of lever to get the thing up and out of the dips and rolling depending on how heavy the roof is.

Will post a pic when I work out how...

[Martin Meredith]

[ollypenrice]

Although all mine use U section channels there's no doubt in my mind that using a female section rim running on a male section rail would be better from the ice, snow, water, crud point of view. If the sides of the roof come well below the walls of the shed there is no problem whatever with ingress.

Olly