Calum Farquhar Guest Writer

GBL > Guest Posts > Team > Guest Writer > L#1610

About:

Calum Farquhar is a PAS 2030 Retrofit Coordinator and director of Insulation Installers Scotland

A Glasgow company specialising in breathable internal wall insulation for pre-1919 stone buildings, with an employed NVQ/SVQ-trained crew and no subcontracting.

Repairing failed scheme installs is part of the company’s normal work.

My company, Insulation Installers Scotland, commissions a 30-year WUFI hygrothermal simulation for every pre-1919 solid-wall property we insulate, produced with a building physicist who co-authors PAS standards.

© Calum Farquhar 19^th August 2026
© GBE GBC GRC GIC GGC GBL NGS ASWS Brian Murphy aka BrianSpecMan ******
23rd August 2026 – 24th August 2026

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Author: Calum Farquhar

[FIG 1: strip-out of a failed vapour-closed install on a Glasgow tenement wall, saturated masonry exposed]

[FIG 2: wood fibre boards bedded in lime adhesive on the prepared stone wall]

[FIG 3: lime plaster finish going on over the wood fibre]

[FIG 4: original air brick preserved and clear at completion]

© GBE GBC GRC GIC GGC GBL NGS ASWS Brian Murphy aka BrianSpecMan ******
24th August 2026

See Also:

GBL Installer

• Company: Insulation Installers Scotland
• Coverage: Glasgow & Central Scotland
• Contact: Calum Farquhar
• T          0800 043 8800
• W             insulationinstallersscotland.co.uk
• PAS 2030 Retrofit Coordinator
• Employed NVQ/SVQ-trained team
• 30-year WUFI hygrothermal simulation
• Specialising in breathable internal wall insulation for pre-1919 stone buildings,
• Repairing failed insulation schemes
• Installing competent insulation schemes

GBL Case Study

GBL Evidence Based Case

• WUFI Verified Retrofit (Guest Post) L#1601

GBL Guest Posts

• WUFI Verified Retrofit (Guest Post) L#1601

GBL Guest Writer

• Calum Farquhar (Guest Writer) L#1610 (this post)

GBE Guest Posts on GBE

• • Guest Post (Collaborate) G#40818
  • Sustainable Renovation Process (Guest Post) G#42350
  • Access ECO4 (Guest Post) G#42579

• • Future of Sustainable Insulation: Natural Materials Over Plastics (Guest Post) G#42605
  • Eco-Refurbishment: Turning Old Buildings into Energy-Efficient Homes (Guest Post) G#42642
  • Bio-Based Insulation and Its Role in Carbon Reduction (Guest Post) G#42658
  • Beyond Bamboo: Exploring Rapidly Renewable Materials for UK Builders (Guest Post) G#42694
  • Sustainable Renovation Process (Guest Post) G#42350
  • Hempcrete in Practice: Natural Carbon Storage for Modern Architecture (Guest Post) G#42713
  • Breathable Walls: The Science of Moisture-Resistant Natural Plasters (Guest Post) G#42732
  • Designing Airtight Yet Breathable Buildings: Balancing Comfort, Health and Sustainability (Guest Post) G#42769
  • Retrofitting for Net Zero (Guest Post) G#42801
  • Refurbishment as Climate Action (Guest Post) G#42874

© GBE GBC GRC GIC GGC GBL NGS ASWS Brian Murphy aka BrianSpecMan ******
24th August 2026

Calum Farquhar (Guest Writer) L#1610 End.