Mannok 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, Mannok 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 Aircrete 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.
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Cavity Wall
1.01 – Solid Ground Floor Slab Insulation Over Structural Slab
1.02 – Solid Ground Floor Slab Insulation Under Structural Slab 1.03 – Suspended timber floor insulated between joists 1.04 – Precast concrete intermediate floor between dwellings 1.05 – Timber separating floor between dwellings 1.09 & 1.10 – Ventilated/unventilated attic – eaves 1.11.1 & 1.12.1 – Ventilated/unventilated rafter void – dormer, partial fill cavity wall with internal insulation 1.11.2 & 1.12.2 – Insulation between and under rafter, unventilated rafter void 1.13.1 – Eaves – insulation between and under rafters / partial fill external cavity wall 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/unventilated attic space with slate cavity closer – partial fill cavity wall -
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