With TimberStrand LSL Concrete Form Board, your crews won't have to waste time sorting or culling. Invest in a product that stands up to multiple reuses vs. buying new product for every job is obvious. But TimberStrand LSL benefits more than the bottom line, it also makes efficient use of natural resources. TimberStrand LSL is made from plentiful, small-diameter trees to engineer superior structural composite lumber for strength, consistency and durability.