Building designers are exploiting the versatility of Boise’s timber BCI joists to produce energy efficient warm walls in timber framed buildings. <br> <br> Designed originally for use in suspended floors, BCI joists are slim, lightweight timber i-beams comprising softwood or LVL flanges and webs made from oriented strand board (OSB). <br> <br> Unlike traditional softwood joists, timber i-joists do not warp or twist and can be supplied in lengths of up to 12m, allowing long clear spans. <br> <br> Resourceful designers are now taking advantage of the product’s qualities to produce well-insulated timber frame walls which satisfy the requirements of the Code for Sustainable Homes. <br> <br> BCI Joists can be used instead of traditional sawn timber studwork to create a lightweight rigid wall structure incorporating a high volume of thermal insulation.<br> <br>