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Thread: Sisalation and new shed (steel)
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10th August 2011, 12:09 AM #1Senior Member
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Sisalation and new shed (steel)
I have had a new shed put up on a new (4 weeks old ) slab. The installer was going to put sisalation under the roof for me but "forgot" when it was done.
As he was adding sisalation for nothing I cant force installation,
Question: Is it worth taking off the roof and fitting sisalation, or should I fit polystyrene insulation, with or without sisalation over the polystyrene but not over the roof supports
its a 3M x 3M steel shed
thanks for your advice
Doug
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10th August 2011 12:09 AM # ADSGoogle Adsense Advertisement
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10th August 2011, 11:51 AM #2GOLD MEMBER
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I assume, and I could be wrong here, that sisalation is mandatory or at least a council or building requirement? Sisilation is definitely worth it though and would consider removing the roof to put it in. I'd check out the requirements of building a shed with your local council first. If it is mandatory, then you could have a case against the company who erected the shed.
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10th August 2011, 06:47 PM #3Member
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Sisalation is not mandatory.
Typically it is mandatory or required where you have a habitable structure and the sisalation is a moisture control barrier to keep moisture and condensation from a roof space, or from entering the internal stud walls.
Insulation works where it creates a cavity. If you are going to take the roof off, do not just put sisalation paper there. Do it properly and use sisa foil+blanket (anitcon type product) which will insulate and provide sisalation.
Not sure of the effectiveness of just trying to stick polystyrene panels in your roof.
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10th August 2011, 07:13 PM #4
I have polystyrene panels under my shed roof and they don't stop condensation, it just runs out of the joins
So at least I know where it will drip
In fact I get less condensation in the section where I haven't installed the polystyrene panels.
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10th August 2011, 07:45 PM #5
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10th August 2011, 10:20 PM #6SENIOR MEMBER
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Depending on where you are in Sydney and the aspect and ventilation of your shed, you may not get any condensation drips. I would be inclined to watch it for a while and fix the problem if it appears. I never had any condensation in my old shed and I used it for 15 years..
Mick
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10th August 2011, 10:34 PM #7GOLD MEMBER
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Would it be too much of an effort to line the roof with batts and cover with 12mm ply. That's what I did. Very cosy.
Graham
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10th August 2011, 11:44 PM #8Senior Member
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Hi Graham
when you covered with 12 mm ply was that for stiffness, would masonite be as good? and did that stop the condensation
thanks for the replies
Doug
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11th August 2011, 12:15 AM #9SENIOR MEMBER
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Doug,
You might be better off with a waterproof ceiling, like villaboard.
Mick
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11th August 2011, 11:22 AM #10Member
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22nd August 2011, 08:31 PM #11Intermediate Member
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I would strip the roof and put "bubblewrap" under it. The stuff works VERY well.
Easy done on a fine weekend.
Paul
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23rd August 2011, 08:12 AM #12Member
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Given the size ,I would probably go a Radiant barrier insulation ,closed cell foam product like InsulShed 50 which has been designed for Sheds, 1 Roll covers 30m2, Pop the roof off on a fine day, easy done in a few hours.
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