E-WS-2 STEEL - TWIN METAL FRAMES - British Gypsum GypWall QUIET IWL British Gypsum Gypwall Quiet IWL Use with reinforced concrete frame construction only DETAIL INFORMATION Floor and Wall Combinations and Code for Sustainable Homes and EcoHomes credits Checklist Visual indicators of critical features you must get right Additional Information Please refer to the Robust Details Handbook for full details of the required construction SIGN IN / SIGN UP To download the online Handbook