I-Beams / H-Beams Used in support of concrete framework H-20 I Beam ( 80 x 200) Lengths : 2.9/ 3.9/ 4.9/ 5.9m Construction : Centre (web)Cottonwood plywood, top and bottom(wings) Finland spruce wood. Glue : Glue for layers in web is WBP and the glue which connects web and wings is Urea-formaldehyde glue.