Polyphenolic chemical compounds were extracted from merbau (Intsia spp.) wood with an aqueous medium at a 1:4 ratio (wt/wt) heated to 80 degrees C for 3 hours. The extracted compounds were characterized by matrix assisted laser desorption ionization time of flight spectrometry and included oligomers with up to six repeating flavonoid units, with resorcinol being the dominant compound paired with a minor amount of catechin units. The extract had a Stiasny number of 92.4 percent. The extract was combined with formaldehyde to produce a resin that was used to manufacture five-layer glued laminated lumber using four wood species, namely, pangsor (Ficus callosa), mindi (Melia azedarach), pine (Pinus merkusii), and mangium (Acacia mangium). The modulus of rupture and shear strength of mangium glued laminated lumber met the requirements of the Japanese standard (''Japanese Agricultural Standard for Structural Glued Laminated Timber,'' 2003), and all products had a low formaldehyde emission.