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JamesF

JamesF's observatory build

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+1 for EPDM.

Had no trouble with my warm room. Hoping to get the scope room roof on in the next few weeks, weather permitting. Hopefully that'll go OK also, although it's a much bigger area, and there's the apex to negotiate!

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What I did with the apex was to lay the sheet over the whole roof and make sure there was enough extra all the way round to tuck up underneath, then fold back one side and apply adhesive from the ridge down a foot or so.  Laid the rubber over the adhesive and rolled down carefully avoiding causing any bubbles.  After that I worked my way down that side to the edge.  Then did the same for the other side.  I used a wallpaper roller to roll down the EPDM to ensure good adhesion.  To spread the adhesive I use a paint roller on a long arm - the sort used behind radiators.  Being water based, the adhesive was washed out of the roller with water immediately after use.  It wasn't allowed to dry during application either.

Edited by Gina

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3 hours ago, Gina said:

What I did with the apex was to lay the sheet over the whole roof and make sure there was enough extra all the way round to tuck up underneath, then fold back one side and apply adhesive from the ridge down a foot or so.  Laid the rubber over the adhesive and rolled down carefully avoiding causing any bubbles.  After that I worked my way down that side to the edge.  Then did the same for the other side.  I used a wallpaper roller to roll down the EPDM to ensure good adhesion.  To spread the adhesive I use a paint roller on a long arm - the sort used behind radiators.  Being water based, the adhesive was washed out of the roller with water immediately after use.  It wasn't allowed to dry during application either.

Thanks Gina. That's the method I used for the warm room and it worked well. I'm just conscious that each side of the ROR is quite a bit bigger and trying to manhandle that much EPDM while not letting the adhesive dry-off too much will be more challenging!

Wrestling with an octopus is an image that springs to mind!

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Yes you might need some clips or clothes pegs to hold it up while you apply adhesive in strips.  Or maybe someone to help you.  My roof was 4ft x 8ft each side - one sheet of marine ply each side on top of the framework.  Sometimes I've used broomsticks and G clamps to advantage.  Or in this case I had lots of odd lengths of timber.

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5 hours ago, Gina said:

Yes you might need some clips or clothes pegs to hold it up while you apply adhesive in strips.  Or maybe someone to help you.  My roof was 4ft x 8ft each side - one sheet of marine ply each side on top of the framework.  Sometimes I've used broomsticks and G clamps to advantage.  Or in this case I had lots of odd lengths of timber.

Yes, lots of timber on hand to hold back the avalanche of rubber may be the answer!

Fortunately, now the weather's cooling off a bit, the adhesive shouldn't dry too quick. I did the warm room in blistering heat and it was drying before I could get it off the roller. (Actually more chance of it being washed off before it dries!)

And apologies James for taking over your thread a bit. I should really continue this discussion on my own thread!

Edited by Astrokev
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No problem :)

I bit the bullet earlier this afternoon and ordered the EPDM and most of the other bits I need to complete both sections of the roof.  Just need to finish off with some hardware from Screwfix, but I can nip into town and get that if necessary.  Or get my wife to pick it up when she does the school run :)

I also ordered ply for the floor so I have it here to go in as soon as I'm ready, which should make things a little safer when I'm walking around inside.

James

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33 minutes ago, JamesF said:

No problem :)

I bit the bullet earlier this afternoon and ordered the EPDM and most of the other bits I need to complete both sections of the roof.  Just need to finish off with some hardware from Screwfix, but I can nip into town and get that if necessary.  Or get my wife to pick it up when she does the school run :)

I also ordered ply for the floor so I have it here to go in as soon as I'm ready, which should make things a little safer when I'm walking around inside.

James

Good progress and planning ahead there.

As regards the floor, I decided to dice with death and am still walking on the joists. Lost count of the number of times I've slipped and twisted my ankle.

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I've fallen through a couple of times myself :)

I had some scabby old offcuts of ply lying about so after the first time I put those down to give a bit of a walkway.  Still managed to fall through once more though :D   After that I learned to be more careful...

James

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I did the floor of mine before most other things - certainly before the roof.

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15 hours ago, Gina said:

I did the floor of mine before most other things - certainly before the roof.

I've made the roof the priority on mine because once that's done I have loads of stuff inside I can get on with over the winter months, and some of that work such as building the piers and running ducting to them from the warm room (which will be below the floor) needs to be done before the floor is laid.  And of course once the space is relatively rainproof I can have leave temporary lighting in place to allow me to work later in the evenings.

James

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I bought a giant tarpaulin for shelter and lots of rope!  That formed a huge tent to work in.  Just a roof wouldn't have sufficed as we get plenty of horizontal rain here.

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1 minute ago, Gina said:

I bought a giant tarpaulin for shelter and lots of rope!  That formed a huge tent to work in.  Just a roof wouldn't have sufficed as we get plenty of horizontal rain here.

I'm hoping that wrapping the walls in breathable membrane should deal with most of that, though I'm not averse to the idea of getting a load of cladding here and fitting it as and when the weather allows.  At least, once I have decided what cladding I am going to use.  Whilst shiplap certainly looks very smart, it's almost too smart and insufficiently "rustic" for a rural location such as this and I'm tempted to go for feather-edge or waney-edge boarding.

James

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This is shaping along very nicely James, its always an adventure building your own isnt it pal  :) i look forward to the next pics.

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EPDM arrived today, along with the bits from Screwfix.  Hopefully the OSB should turn up tomorrow.

James

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Well, the ply for the floor arrived today, but not the OSB :(

I think I have enough OSB lying about to do the warm room roof so I may try to get that done this weekend, but the rolling roof will have to wait another week by the looks of it.

James

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All good things come to those who wait and all that 😬😬😲 it's a killer waiting though eh. Looking forward to the next install of pics James.

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10 minutes ago, LeeRich said:

All good things come to those who wait and all that 😬😬😲 it's a killer waiting though eh. Looking forward to the next install of pics James.

I have a fair few non-astro things to get done this weekend and there are other jobs that can be done on the build as well so I'm not going to stress about it.  If the OSB turns up next week (which really should happen) then I may even still meet my target of having the roof on before the end of October :)

James

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15 minutes ago, Stub Mandrel said:

Cripes, I've only just discovered this thread.

Well done James!

Thank you, Neil :)

James

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