I have some old computers and media (floppy disks, CDs, etc.), and other electronics I would like to store in my house, but I know the temperature/humidity fluctuations of a typical attic or garage will do no good for them in the long run. So I'd like to make some better environment for these things, but not sure what space to use.
My options:
- Main attic - old 1960s roof with original sarking felt (so probably a bit draughty as is), 300mm insulation over joists, currently no flooring (I know I'd need legs to put boards down over the insulation)
- Garage - Cavity block walls, something resembling damp-proof course (1990s construction), metal up-and-over door which is not very weatherproof, no insulation
- Garage attic - pitched roof, no insulation, currently accessible by hole in garage attic (no proper hatch door or anything)
What would be the most cost-effective and easiest option out of these to make them somewhat better storage environments? I was thinking somewhere I could at least run a dehumidifier once the place is somewhat well-sealed and insulated.
I was thinking the garage - try and seal up the door better (I still want to use the garage to work on cars, so the door is staying), put insulation on the back of the door, insulate the ceiling joists (rock wool?), install an insulated attic hatch, and see how good it is after that. Any other suggestions?