In this study, the effects of impregnation materials di-ammonium phosphate, aluminium sulphate, potassium carbonate, calcium clorur, zinc clorur on combustion properties of 3 ply laminated veneer lumbers (LVL) produced from mulberry (Morus alba L.) by using of phenolformaldehyde (PF), poly (vinyl acetate) (PVAc) have been investigated. The pressure-vacuum method was used for impregnation process. Combustion test was performed according to the procedure of ASTM-E 69 standards. According to the test results zinc chloride was found to be the most successful fire retardant chemical in LVL with PF adhesive. Since zinc chloride diminishes combustion, LVL produced from mulberry with PF adhesive and impregnated with zinc chloride can be advised to be used as a fire resistant building material where required.