GQAFEN8 Produce specifications for fenestration installations

Overview

This standard defines the surveyor’s role from taking site measurements to producing the accurate and compliant window specification used by installers, fabricators, and customers. It covers documenting window configuration, such as openers, glass type, trims, and add ons, and any associated installation requirements. This information can be generated manually or using computers, with outcome to produce clear, accurate drawings, models, annotated details, and written documents.

They must interpret survey data, manufacturer guidance, and regulatory requirements to ensure specifications reflect regulatory compliance, tolerances, access needs, and interfaces with other building fabric. When needed they must challenge missing or conflicting information, to ensure the correct specification is supplied or limitations highlighted.

This standard is for you if you work in the Fenestration and Glazing Industry and are involved in producing specifications from surveys for onsite installation work

Performance criteria

You must be able to:

  1. obtain site data including dimensions, squareness, diagonals, reveal conditions
  2. identify cavity closers, fire barriers, moisture barriers, open cavities, DPC continuity
  3. identify exposure conditions & determine suitability of product performance
  4. identify services (cables, tracks, pipes) interfering with installation
  5. obtain manufacturer guidance on fixings, sealants, packers, and system limits
  6. confirm customer requirements for operation, glazing type, ventilation devices, hardware
  7. verify safety & access constraints
  8. match manufacturing sizes derived from structural opening measurements using correct deductions
  9. document all configuration elements: frame type, glass type, opening lights, trims, add ons, sill details, coupling methods
  10. capture fixing requirements: positions, distances, packers, lug types
  11. include drainage strategy, weep hole management, sill overhang ≥25 mm
  12. specify safety glazing in critical locations
  13. record fire barrier and cavity closure requirements
  14. define sealing methods including wet sealant, foam tapes, backer rods
  15. indicate tolerances, movement allowances, joint configuration in line with specifications
  16. identify access constraints for installation including safe working space, internal reveals, external obstacles
  17. produce accurate sketches, CAD drawings or digital models showing:
  • dimensions, reference levels, opening directions
  • frame positions (flush or check reveal)
  • sill details, drainage paths
  • if additional permanent or temporary support is needed
  • fixing locations 

Knowledge and understanding

You need to know and understand:

  1. types of information needed including reports, notes, calculations, drawings, product literature
  2. how product selection influences installation
  3. how ancillary components (packers, trims, vents, tapes) impact performance
  4. who requires technical information & why:
  • Installers (to follow fixings, sequencing, sealants, packers).
  • Fabricators (manufacturing sizes, glass specs, hardware positions)
  • Building control (security, ventilation, fire safety, means of escape)
  • Customers (aesthetics, ventilation, safety, thresholds)
  • Designers/architects (interface details, tolerance requirements)
  1. how specifications affect fabrication as deductions & tolerances determine manufacturing sizes
  2. how incorrect measurement compromises sealing, fixing distances, drainage.
  3. how the orientation of coated/laminated glass affects thermal or security performance
  4. how to include scale, annotations, cross references to clauses or igures within drawings
  5. how to use of consistent terminology
  6. how to cross check requirements against Building Regulations or Standards (fire, ventilation, escape, structure)
  7. how to include all mandatory information needed by installers (fixings, sealing, drainage, glazing, packers)
  8. Building Regulations or Standards relevant to the job and your role
  9. when to retain or restore fire barriers when disturbed
  10. where correct location of safety glazing should be in critical locations
  11. why means of escape, including opening size & operation, must meet egress requirements in line with standard operating procedures (SOPs) and regulatory requirements
  12. where and why trickle vents or designed ventilation may be required
  13. how and why security specification must consider unauthorized entry risks
  14. how and why for structural integrity, presence of lintels & load paths must be confirmed
  15. how and why weathertightness, including drainage paths, positioning, sealing, should be considered
  16. how and why thermal performance, including frame positioning to minimize cold bridging, should be considered

Relevant Occupations    

Glaziers Window Fabric and Fitters

Keywords           

Fenestration, Surveying, Specifications