Heat or ventilate?

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28 Dec 2025
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I have a breezeblock outbuilding, two sides built against the wall of my house (not insulated), one side built against concrete steps up to my garden (newly waterproofed with DPM, drip drain, insulation and ply-lined), and one side (not insulated) with door (single glazed) and window (double glazed). The floor has DPM and concrete laid on top. The new flat roof is insulated EPDM with ply-lined ceiling.

I'd hoped to use the space as a studio/workshop but this week I've been seeing condensation on the single-glazed door window and on the ply wall and ceiling.

Last night I left the window open slightly and this morning ran the oil-filled radiator and de-humidifier and it seems to have resolved the problem.. for now.

My question is how to best keep the space warm and dry so that I can store paper/textiles/equipment in there. Or am I flogging a dead horse?
Should I go for a background heat source or better ventilation, or both?

Any advice muchly appreciated.
 

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