Top 10 29 mm bestseller 2026

29 mm gypsum board is a 9 mm board with about 20 mm of EPS foam bonded to the back, giving ceiling and insulation in one sheet. For top-floor and attic ceilings and rooms where you want lower AC bills. Gyproc ThermaLine, standard and moisture-resistant, 120x240 cm; 44 and 59 mm also available.