08000 322 122
United Kingdom
1800 322 122
Republic of Ireland

Accredited Construction Details

Quinn Building Products Junction Designs to combat Thermal Bridging

Thermal bridging is a much talked about but little understood phenomenon in building design. Thermal bridges occur at all junctions in the building, as well as when penetrations of the thermal insulation envelope occur. Thermal bridges can account for 35-50% of overall fabric heat losses when standard values are used.

To reduce head loss through thermal bridging, Quinn Building Products has developed a bespoke set of junction designs, each with its own unique thermal bridging value calculated by an NSAI-accredited Thermal Modeller, in order to bring down any heat loss to less than 10%.

This guarantees zero mould growth risk, and using conventional construction methods combined with the range of Quinn Lite blocks, the use of the freely-available details can allow designers and contractors to more easily achieve compliance with Part L, and in some cases  reduce the amount of renewable energy resources specified, ensuring significant capital savings.

The thermal bridging values for each junction are stored in the Y-value calculator (try out the Quinn Y-value Calculator for your project).

  • Cavity Wall

    1.01 - Ground Floor - Insulation above slab
    1.02 - Ground Floor - Insulation below slab
    1.03 - Timber suspended ground floor
    1.04 - Concrete intermediate floor within a dwelling
    1.05 - Timber intermediate floor within a dwelling
    1.09 & 1.10 - Eaves- Unventilated/Ventilated attic
    1.11.1 & 1.12.1 - Eaves- Unventilated/Ventilated insulated at ceiling
    1.11.2 & 1.12.2 - Eaves- Unventilated/Ventilated insulated between and under rafters - Dormer
    1.13.1 - Eaves - Ventilated insulated between and under rafters - Pitched Ceiling
    1.14 - Eaves - Unventilated insulated between and over rafters - Dormer
    1.15 - Ventilated Roof - Attic floor level
    1.20 - Flat Roof - Parapet
    1.21 - Ope - Split Lintels - Steel and concrete
    1.23.1 - Ope - Pre-stressed concrete lintels
    1.23.2 - Ope - Pre-stressed concrete lintels - Proprietary closer
    1.24 - Ope - Jamb with closer block
    1.25 - Ope - Jamb with proprietary cavity closer
    1.26 - Ope - Concrete forward sill
    Diagram 1 - Galvanised steel top hat lintel detail bridging masonry cavity wall
    Diagram 2 - Concrete back sill detail - Insulation below wood sill section
    Diagram 3 - Eaves - Ventilated roof space - Wall head close with slate
  • External Insulation

    2.01 - Ground Floor - Insulation above slab
    2.02 - Ground Floor - Insulation below slab
    2.03 - Timber suspended ground floor
    2.08, 2.09, 2.10.1 & 2.11.1 - Eaves - Unventilated/Ventilated - Insulation between and under rafters - Dormer
    2.12.1 - Eaves - Unventilated - Insulation between and over rafters - Pitched ceiling
    2.13 - Eaves - Unventilated - Insulation between and over rafters
    2.14 - Ventilated Roof - Attic floor level
    2.19 - Flat roof - Parapet
    2.21 - Ope - Jamb
    2.22 - Sill
  • Internal Insulation

    3.02 - Ground Floor - Insulation below slab
    3.03 - Timber suspended ground floor
    3.04 - Timber Intermediate Floor within a dwelling
    3.05 - Masonry separating cavity wall - Plan
    3.15 - Gable - Insulation between and under rafters - Unventilated/Ventilated rafter void
    3.20 - Flat Roof - Parapet
    3.21 - Ope - Sill
    3.22 - Ope - Prestessed concrete lintels
    3.23 - Ope - Jamb with proprietary cavity closer
    3.24 - Ope - Concrete forward sill
    3.25 - Ope - Concrete back sill
  • Timber Frame

    4.02 - Ground Floor - Insulation below slab
    4.23.1 - Timber Frame - Separating wall through ground floor
    4.23.2 - Timber Frame - Partition wall through ground floor
  • Steel Frame

    5.02 - Ground Floor - Insulation below slab
    5.22.1 - Steel separating wall through ground floor
    5.22.2 - Steel partition wall through ground floor
  • Hollow Block

    6.02 - Ground Floor- Insulation below slab
    6.03 - Timber suspended ground floor
    6.04 - Timber intermediate floor within a dwelling
    6.13 - Ventilated Roof - Attic floor level
    6.18 - Flat roof - Parapet
    6.20 - Ope - Jamb detail
    6.21 - Ope - Sill