Roofs

Roofs bring together structure, insulation, ventilation and weatherproofing, and most of the risk sits at the junctions. This section groups our roof details by type: flat roofs, pitched roofs, green roofs, loft conversions and Passivhaus roofs. Details cover eaves, verges, parapets, abutments, valleys, rooflights and drainage, in warm and cold roof constructions, across masonry, timber frame, CLT and steel frame. For details grouped by covering, such as slate, clay tile or single ply membrane, see Roof Finish. All details are available in CAD, Revit and SketchUp, and the library holds 800+ details in total.

What’s the difference between a warm roof and a cold roof? In a warm roof the main insulation sits above or with the structural deck, keeping the structure on the warm side. In a cold roof the insulation sits at ceiling level or between the joists, with a ventilated space above. Our Technical Study on flat roof insulation and managing moisture explains the differences.

Which Building Regulations apply to roof details? Mainly Part L for insulation, Part C for moisture and condensation, and Part B for fire, including the roof covering. BS 5250 gives guidance on managing moisture.

Which file formats can I download? Pro members get DWG, Revit, SketchUp, PDF and JPEG. Lite members get DWG. You can also buy single details.