Sisalation and new shed (steel)

[doug1]

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

[Scott]

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.

[banjoping]

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.

[Big Shed]

I have polystyrene panels under my shed roof and they don't stop condensation, it just runs out of the joins:doh:

So at least I know where it will drip:B

In fact I get less condensation in the section where I haven't installed the polystyrene panels.

[Harry72]

Not sure of the effectiveness of just trying to stick polystyrene panels in your roof.
About as effective as a esky:cool:

[Glider]

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 :)

[Carry Pine]

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

[doug1]

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

[Glider]

Doug,

You might be better off with a waterproof ceiling, like villaboard.

Mick :)

[banjoping]

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

Graham would have been using the ply to hold in the batts in the ceiling, similar to what you do with gyprock (stuff batts in the cavity and fix the gyprock). As long as the masonite can span the spacings of whatever it is fixed to, should be fine

[me3_neuralfibre]

I would strip the roof and put "bubblewrap" under it. The stuff works VERY well.

Easy done on a fine weekend.

Paul

[Shedblog Au]

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. :2tsup: