18mm (8'x4') MOISTURE RESISTANT MDF Screws Nails and Fixings-2 Void‑free core for maximum strength

Void‑free core for maximum strength and no water‑trapping gaps

Timber roofs should have the first layer of felt nailed down in accordance with BS Code of Practice 144

Smooth planed boards two coats ~ 15-20 square metres

MDF is moisture-resistant and free from natural defects like knots or cracks

18mm (8'x4') MOISTURE RESISTANT MDF Screws Nails and Fixings-2 Void‑free core for maximum strengthWhat MR MDF Actually Is MR MDF is standard MDF enhanced with moisturerepellent resins and denser fibre bonding, giving it better resistance to swelling when exposed to humidity or light splashes. It typically contains 1015% more resin than regular MDF, slowing water absorption. It sits between standard MDF (for dry interiors) and BWR exteriorgrade boards (for heavy moisture). It is not waterproof prolonged water exposure will still cause swelling