Assessment of thermal performance of out of plane rooflights

Technical Document NTD02.1

The Rooflight Association, 2022
Assessment of thermal performance of out of plane rooflights Download document

Document Status

Current

Supplement

Core Supplement

Series

Technical Document

Abstract

This document updates the 2021 version of NTD02 to reflect the changes of BR443 and the 2021 version of Approved Document L in England. Defines Ur and Urc values, based on the developed area of the rooflight, why their use rather than Uroof_opening-value is appropriate for use as the limiting value in building regulations, why they should be calculated for out-of-plane rooflights, and for rooflight-and-upstand assemblies.

History

2022 edition. Supersedes the NARM Technical Document NTD 2.1 (2022).

Subjects

  • Special subject areas
  • Lighting, natural
  • Windows and doors
  • Thermal insulation
  • Rooflights
  • Energy efficiency/Energy Management
  • Environmental issues/energy

Publisher History

The trade association representing the UK’s rooflight industry develop standards and codes of practice in the provision of natural light in built environments. Publications cover all aspects of rooflight design, specification and installation. They were formerly known as NARM, the National Association of Rooflight Manufacturers.

Information

NBS

NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.

Accuris

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