Loft Insulation
Loft insulation normally refers to insulation that is required in a cold roofs, that is insulation installed horizontally between and on top of roof or ceiling beams, not insulation installed between and on top of the roof structure and rafters (a warm roof).
In a cold roof the air space above the ceiling joists is ventilated and therefore cold, without insulation between it and the warm house below there is significant risk of the warm moist air from the living spaces rising and then cooling quickly on the cold surfaces of the roof space and condensing. This can introduce moisture on the surfaces of the roof structure which can in turn lead to mould, and decay over long periods.
Introducing one or more layers of insulation between these spaces reduces heat loss and reduces the risks of condensation, preventing warm moist air from entering directly into the loft space.
The first building regulations on home insulation were issued in 1965 and required just 28mm of insulation for a loft, today this is recommended as at least 250 up to 300mm.
[edit] Related articles on Designing Buildings
- Approved Document F.
- Cold bridge.
- Condensation pipework.
- Damp.
- Damp proofing.
- Dehumidification.
- Designing out unintended consequences when applying solid wall insulation FB 79.
- Dew point.
- Diagnosing the causes of dampness (GR 5 revised).
- Dry-bulb temperature.
- Electrical resistance meters.
- Flashing.
- Humidification.
- Humidity.
- Hygrothermal.
- Interstitial condensation.
- Methodology for moisture investigations in traditional buildings.
- Moisture.
- Moisture content.
- Mould growth.
- Penetrating damp.
- Psychometric chart.
- Rising damp.
- Sling psychrometer.
- Spalling.
- Treating brickwork with sealant or water repellent.
- Water vapour.
- Wet-bulb temperature.
- Blue roof.
- Condensation in buildings.
- Domestic roofs.
- Flat roof.
- Flat roof defects.
- Interstitial condensation.
- Inverted roof.
- Roofing defects.
- Thermal bridging in buildings.
- Thermal comfort.
- Warm roof.
- Cold roof
Featured articles and news
Designing for neurodiversity: driving change for the better
Accessible inclusive design translated into reality.
RIBA detailed response to Grenfell Inquiry Phase 2 report
Briefing notes following its initial 4 September response.
Approved Document B: Fire Safety from March
Current and future changes with historical documentation.
A New Year, a new look for BSRIA
As phase 1 of the BSRIA Living Laboratory is completed.
A must-attend event for the architecture industry.
Caroline Gumble to step down as CIOB CEO in 2025
After transformative tenure take on a leadership role within the engineering sector.
RIDDOR and the provisional statistics for 2023 / 2024
Work related deaths; over 50 percent from constructuon and 50 percent recorded as fall from height.
Solar PV company fined for health and safety failure
Work at height not properly planned and failure to take suitable steps to prevent a fall.
The term value when assessing the viability of developments
Consultation on the compulsory purchase process, compensation reforms and potential removal of hope value.
Trees are part of the history of how places have developed.
The increasing costs of repair and remediation
Highlighted by regulator of social housing, as acceleration plan continues.
Free topic guide on mould in buildings
The new TG 26/2024 published by BSRIA.
Greater control for LAs over private rental selective licensing
A brief explanation of changes with the NRLA response.
Practice costs for architectural technologists
Salary standards and working out what you’re worth.
The Health and Safety Executive at 50
And over 200 years of Operational Safety and Health.
Thermal imaging surveys a brief intro
Thermal Imaging of Buildings; a pocket guide BG 72/2017.