This research aims to study the using cassava pit wastes mixed with cement to particle board walls. The Portland cement type1: fine sand: tap water ratio is equal to 1: 0.5: 0.416 by weight. The ratios of cassava pit wastes to cement are used following: 0.05 0.06 0.07 0.08 0.09 and 0.10 by weight. The cassava pit wastes are crushed by plastic plastics granulators (pass sieve no.4). The casting of particle board walls use the compression machine in room temperature (30 – 35 degree of Celsius) and control 0.75 g/cm3 of density. The TIS 878-2537 standard (cement bonded particle board: high density) is followed to test the properties of particle board wall. Resulting the cassava pit wastes mixed with cement can cast to particle board walls and have good properties especially the thermal insulation property.

This research aims to study the application of coconut meal and corncob fiber as high density cement-bonded fiberboard. The cement: fine sand: coconut meal and corncob fiber: water: cement setting accelerator (aluminium sulphate (Al2(SO4)3) calcium chloride (CaCl2) sodium silicate (Na2SiO3)) ratio is equal to 1: 0.2: 0.05: 0.3: 0.03 by weight. The fibers are taken from coconut meal: corncob that 5 ratios are used following: 0.0500: 0 (CN0) 0.0375: 0.0125 (CN25) 0.0250: 0.0250 (CN50) 0.0125: 0.0375 (CN75) and 0: 0.0500 (CN100) by weight. 12% of Sodium Hydroxide (NaOH) was used to modify the fibers by using 1: 10 of fiber: solution and boiling 100 degree of Celsius (1-3 hours). The fiberboard production use pressure casting in normal temperature (30 – 35 degree of Celsius) and 0.75 g/cm3 of density. Resulting the CN75 ratio is suitable ratio which pass TIS 878-2537 standard (cement bonded particle board: high density) and has good physical properties mechanical properties and thermal insulation. The most suitable cement setting accelerator is calcium chloride (CaCl2).