# Part J4 Info

- [J4D3 Thermal construction — general](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d3-thermal-construction-general.md)
- [J4D4 Roof and Ceiling Construction](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d4-roof-and-ceiling-construction.md)
- [J4D5 Roof Lights](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d5-roof-lights.md)
- [J4D6 Walls and glazing](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d6-walls-and-glazing.md)
- [NCC 2019 Façade Calculator and Better Building](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d6-walls-and-glazing/ncc-2019-facade-calculator-and-better-building.md)
- [Specification 37](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d6-walls-and-glazing/specification-37.md)
- [J4D7 Floors](/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d7-floors.md)