Tomorrow I go back to work after 2 months off. Now I have totally wasted that time, so thought I better catch up with a little experiment I had in mind. With some old 9mm OSB, I made a 200mm deep beam. It is 2.26 m long, and held together with cheap PVA 'no nails' type adhesive (cost a quid a tube). The flange is 100mm wide. One flange is 2 layers of OSB, the other is 2 strips of timber, 20mm by 35mm holding the other flange in place. To test it I put a box on it an