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Post by chrish on Jul 17, 2013 8:28:18 GMT
I have taken delivery of my 1999 Renault Master Ex Ambulance........and my first job is to sort out the skylights or roof lights. They have been removed and "blanked off", BUT they didn't do a great job and I want to replace with skylights again before the rain hits!!!
My problem is the apertures are 35cm x 50cm which I have been told is a "strange" size because most of them seem to be square!! I don't really want to start cutting the roof because it's all insulated......please help!
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Post by n brown on Jul 17, 2013 8:51:22 GMT
difficult to advise without seeing,depends how they were blanked off.normal sizes for rooflights are 28x28,40x40 and 50x50 so you could put in a 28x28 just in the blanking off patch,or just cut the roof,which isn't that big a deal,with or without insulation
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Post by chrish on Jul 17, 2013 9:11:15 GMT
oh ok - i thought the cutting would be hard work with the insulation. Can't use the blanking plates because the guy that put them on was obviously drunk, upside down and doing it in the dark, as he missed most of the hole!!! Thanks for your reply
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Post by n brown on Jul 17, 2013 9:30:20 GMT
if you're near Bristol i'd be happy to look at it,but if you need any advice on the practicalities just ask
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Post by Firefox on Jul 17, 2013 9:41:59 GMT
Mini Heki is nice but 400x400. Midi Heki is 700x500.
Cutting roof and insulation should not be a big deal. You may have to make up a timber frame say 500x500 the depth of your insulation to frame up the hole. A 500x500 would seem to give you the minimum of work. Just need to enlarge the 350 dimension a bit on each side.
If you want a quick leakproof fix, get a clear perspex sheet 450x600 and glue that down using sikaflex 512 over the hole. This may end being semi-permanent though as sikaflex will be leakproof but very difficult to get off. You will probably have to cut it off with a razor knife.
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Post by chrish on Jul 17, 2013 9:47:44 GMT
hmmmm ok! So i have options?!? All the shops were making it feel like a lost cause!!! I'm up in Lancashire and it's SORNed unfortunately but thanks for your kind offer n brown Ok....I'll have a look about the cutting but if the weather turns.......perspex it is!!
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Post by n brown on Jul 17, 2013 10:14:15 GMT
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Post by Firefox on Jul 17, 2013 10:22:04 GMT
If you go down the perspex route for a temp fix, make sure you get the quite flexible stuff and the stuff which is resistant to ultraviolet light for green houses and outdoor glazing. I have seen it in Wickes building supplies etc. Some stuff can be brittle or not up to the sun,but if you get the exterior glazing stuff you should be OK.
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Post by chrish on Jul 19, 2013 9:06:03 GMT
hmmmmm.......I've had a change of plan!! I don't need the light from the roof lights so I'm just thinking about covering the holes in the roof, inside with chequer plate?! What would be the best way of fixing it to the roof? I'm only thinking of using 1.5mm plate so shouldn't be that heavy but the ceiling is a fibre glass with it being an ex-ambulance.
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Post by Firefox on Jul 19, 2013 9:44:05 GMT
I would plate over them externally using aluminium chequer plate or just plain aluminium sheet. Again fix down with sikaflex 512. If you do it from the bottom and the top is not sealed you will form a well which will fill with standing water which could cause problems. If you want to plate from bottom as well, you can do the same thing. Aluminium plain plate or plastic sheet fixed with sikaflex 512. Fill the gap in between the sheets with kingspan/celotex insulation board or rockwool.
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Post by chrish on Jul 19, 2013 11:27:04 GMT
Yep, exactly my plan - I'll have a look for some Sikaflex....... Thanks
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Post by brewkit on Jul 19, 2013 18:01:47 GMT
before you blank off the holes, have a good head scratch about rooflights, I put 2 in my bus, they really improve lighting and ventilation. and absolute doddle to fit. .
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Post by n brown on Jul 19, 2013 18:05:37 GMT
if you stay in hot places you'll regret not having roof vents
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Post by Etienne Le Croq on Jul 19, 2013 20:44:42 GMT
You also need them in our hot summers!
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