Temporary & permanent shed roof fix

B0bbyEwing

While I'm talking about sheds, will there be a downside to lining the internal with some sort of rigid insulation, be it poly or PIR & then over boarding with thin ply?

Aside from the obvious fact I then wouldn't be able to use the internal studding as mini shelves for small items.

Im not too interested in which is best out of poly vs PIR. I imagine PIR but it'll be much harder to get cuts of that from work whereas I could probably get poly for free.

There's a thin air gap around the door. There's also a big opening at the back corner because this used to be a dog house when the previous homeowner had it.

I don't know how much of it is just simply external temps & how much is due to the leak but the tins in there are rusting badly. I have rubber in there (bicycle tyres) which are growing mould.

The overboarding was more coming from a doing something about spiders/cobwebs rather than insulating but if I'd be overboarding then I may as well insulate.

Unless there's downsides to it.

chrisw

The downside will be massive condensation problems. An old draughty but waterproof shed will be much better for storage.

WIAWSNB

As Chris says. It seems counter-intuitive, but a draughty shed is a dry shed!

Insulation only works if you add heat. You'd still need to add ventilation, so - again - it'll be 'draughty'.

You'd usually only line and insulate an outdoor building if you needed to make it comfy to be in, say a winter-time workshop or hobby room. Even then you'd need to provide some air circulation to keep it dry, and actual heat to make it 'warm'.

Your items are rusting either because the rain got to them, or the rain has simply saturated the inside air to the point everything will rust, or simply because you aren't ventilating the shed properly.

Once you sort the roof, then look at ensuring there is a nice airflow through the shed, and you should have zero problems.

WIAWSNB

https://forums.moneysavingexpert.com/discussion/comment/81955430#Comment_81955430

I was hoping there would be sound.

SCRREEEEEEEEEEEEEEEEEEE!

B0bbyEwing

https://forums.moneysavingexpert.com/discussion/comment/81955693#Comment_81955693

By properly are we talking about size or placement of openings?

Because that dog opening is larger than anyone would realistically have on their shed but there's nothing 'up top'.

WIAWSNB

Most sheds are intrinsically draughty enough - air passes through the boarding, around the doors, out the gappy eaves, etc.

From what you say, yours would also appear to be, although depending on the size of the shed, that opening might not provide the required flow through the whole building.

It also may be the case that the inside of your shed is just 'wet', so it being particularly damp is no surprise.

What I am saying, tho', is that if you place that paint can outside on a raised platform, and provide a roof over its head to shield it from rain, it is unlikely to rust, certainly a lot less than anything kept inside an unventilated shed.

I've mentioned on here a few times when discussing this sort of issue, I often walk past farm buildings being used as holiday homes, and they have a large open carport which also houses washing machines and TDs - bone dry.