Profile: Building Innovation Ltd. (Tapered Insulation) specializes in the design, fabrication, and supply of tapered insulation systems. Our tapered roof insulation design service includes survey, risk analysis, design, fabrication, and supply. Our Bi Drain consist of a geotextile filter, thermally bonded on one side of a cuspated high density polyethylene core. Our Bi- Stick xxx PU adhesive is a cold applied moisture curing adhesive for bonding insulation bonds.