Thread: Sisalation and new shed (steel)

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.

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.

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.

Originally Posted by banjoping

Not sure of the effectiveness of just trying to stick polystyrene panels in your roof.

About as effective as a esky

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

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

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

Doug,

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

Mick

Originally Posted by 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

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

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

Easy done on a fine weekend.

Paul

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.