U-value Calculator If you are a human and are seeing this field, please leave it blank. Fields marked with an * are required Customer Details Contact Name * Company Name * Address Post Code * Telephone * Email * Preferred Supplier Project Details Project Name * Project Size (m2) Address Post Code * By submitting this form you are agreeing to our Privacy Policy. * View Privacy Policy. Please keep me up to date with YBS Insulation news, case studies, blogs and offers Enter Your Construction Details Step 1 Select Roof Wall Floor Step 2 Select Pitched Roof Flat Roof Step 3 Select Over Rafters Under Rafters Step 3 Select Under Joist Over Joist Two Layer Step 4 Select 400mm centers 600mm centers Step 5 Select 0.18 Refurbishment 0.15 New Build 2010 Regulations 0.13 New Build 2013 Regulations 0.13 Refurbishment 0.11 New Build Step 2 Select Timber Frame Dry Lining External Wall Insulation Step 3 Select Brick External Block & Render External Cladding External Step 3 Select Solid Brick Cavity Wall Step 4 Select Standard Breather Membrane Reflective Breather Membrane Step 4 Select 0.28 Extension 0.30 Refurbishment Step 4 Select Un-Insulated Cavity Step 4 Select Insulated Cavity Un-insulated Cavity Step 5 Select Insulated Vapour Control Layer Standard Vapour Control Layer Step 5 Select Insulated Vapour Control Layer Step 5 Select 0.28 Extension 0.30 Refurbishment Step 6 Select 0.28 Extension 0.30 Refurbishment 0.20 New Build 2010 Regulations 0.18 New Build 2013 Regulations 0.22 Refurbishment 0.17 New Build Step 2 Select Suspended Timber Floor Floating Floor Step 3 Select 50mm Cavity Above 100mm Cavity Above Step 4 Select 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1