So winter is coming soon and I have a old house with no attic

>>1242671
normally there are vents in the eaves
leave about 50mm/2inch between the insulation and the actual roof timbers to allow air to circulate otherwise it will damp and rot?

>>1242692
My soffits are not vented, they are solid so I didn't think I needed to do that.

Glasswool wont rot...

But you can use styrofoam too. Its dirt cheap and you can use pu foam as glue. Just get a long enough nail. Put some small pu dots on the styrofoam panel then nail it on the wood with the nail. The nail holds alk ubtil the foam hardens. Also you get a natural small air pocket for extra insulation

>>1242702
I thought about foam boards but those are very expensive. The fiberglass is the best bet for money.

Where do you live that styrofoam is more expensive than glasswool.

You will habe to put a water barrier foil on it.

You can also go dirt cheap and use just some cheap pe- foil and fold it so that there are 5 layer on top each other and nail it to the wood. You will get problems with mold this way.

>>1242671
>use it as storage
as conditioned space? or just to keep the heat from coming through?

cut holes in the floor and rent a blow insulation machine, add insulation below floor boards

>>1242671
do not insulate the roof

>>1242815
This. Your roof isn't designed for it and you need to do more research
. The tldr is you need to install vented soffits and roof vents before you put the batting up.

Depending how much shit you want to put up there, your ceiling might not hold the load either.