TM59 Assessment

Reasons to invest in a TM50 assessment

Evidence has shown that the residential sector needs to pay more attention to the risk of overheating. There are many refurbished or brand new homes that have designs that contribute to the risk of overheating such as:

  • Inadequate natural ventilation
  • High proportions of glazing
  • Larger window to wall ratios
  • Extensive use of communal heating systems

What happens if a building overheats?

It’s something that everyone should take seriously, as the implications of living in a building that is overheating can be detrimental to their health and wellbeing. Not only can it contribute to stress, sleep deprivation and anxiety, but it can make certain occupants especially vulnerable during heat waves.

It has even been announced by The Committee on Climate Change that they have estimated mortality rates arising from overheating could rise from 2000 per year in 2015 to 7000 per year by 2050.

By performing a TM59 assessment, you can ensure your project is complying with the right regulations

The TM59 assessment has been provided by CIBSE in order to assess the risk of overheating in homes. In order to cover every aspect, an assessment will cover:

  • 1 Introduction
  • 1.1 About the methodology
  • 1.2 Clarifications
  • 1.3 Basis of design comfort criteria
  • 1.4 Implications of applying the methodology

  • 2 The methodology
  • 2.1 Identification of risk
  • 2.2 Methodology overview
  • 2.3 Suggested reporting requirements

  • 3 Guidance
  • 3.1 Sample size
  • 3.2 Weather files
  • 3.3 Window and door openings
  • 3.4 Exposure type
  • 3.5 Infiltration and mechanical ventilation
  • 3.6 Air speed assumptions
  • 3.7 Blinds and shading devices
  • 3.8 Pipework, hiu and heat maintenance tape heat loss
  • 3.9 Communal corridors

  • 4 Compliance criteria
  • 4.1 Definitions
  • 4.2 Criteria for homes predominantly naturally ventilated
  • 4.3 Criteria for homes predominantly mechanically ventilated
  • 4.4 Adjustments for homes with vulnerable occupants
  • 4.5 Corridors: assessment criteria

  • 5 Internal gains profiles
  • 5.1 Occupancy and equipment
  • 5.2 Lighting
  • 5.3 Gain profile tables and charts

  • 6 Supplementary information on profile development

How can Pro Sustainability help?

We are specialists in thermal comfort analysis and have a passion for offering sustainable solutions. Whatever the demands of your project may be, we aim to be collaborative and flexible so we can work together to achieve sustainability in the built environment.

If you’d like to talk to us about your project and your concerns surrounding thermal comfort, we’d like to hear from you. Use our contact form or call us today on 01235 751993.