Le'ger re'volutionne in depth how to build steel structures Le'ger are combustible, versatile (walls, floors, roof trusses) and qualite' uniform!; they de'forment not and do not lose their capacite's with age; re'sistent insects and they are better adapte'es LEED requirements of the new standards of insulation, soundproofing and conservation fore. more... See more text