Or you could make a warm roof, and insulate the outside instead. Layer on PIR, OSB, then EPDM.
@NotThamesWater started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Or you could make a warm roof, and insulate the outside instead. Layer on PIR, OSB, then EPDM.