I was planning to build a large'ish (8'x15') shed to store spare household bits and pieces but the timber cost estimate has come out a bit high (£1400) so I'm thinking of one of the cheaper metal sheds ... problem is how to avoid condensation so I'd value the team's opinions and collected experience.
Floor: The plan is to concrete some 4x4 spurs in the ground, then half lap and bolt 2x4s across the spurs, hang some joists between the 2x4s and then cover with 18mm OSB. More work than laying a slab, but gives some ventilation, saves having to dig-out and is easier to remove when the time comes.
The ceiling and walls are going to need insulating so I'm wondering whether it's enough to stick polystyrene tiles on them. Although, I'll want some shelves so there will have to be some upright battens and I could put insulation between them and board over with 8mm OSB - problem then might be condensation running down the walls behind the insulation and making the air more humid.
What have others done?