The superior airtightness performance qualities of the Wraptite® air barrier system
from the A. Proctor Group will enhance a new state-of-the-art development at St
Dunstan’s College - a co-educational independent school in Catford, London.
Contractor Willmott Dixon will deliver the new Junior School, STEM building and
Sixth Form Hub at St Dunstan’s.
Designed by Bond Bryan Architects, the new development will be sited adjacent
to the existing historic Headmaster’s House and connected by a glass atrium.
Phase one includes a new junior school with specialist facilities for art, music and
performance, and phase two includes the construction of the STEM Centre and
Sixth Form Hub.
A vital element of the design and construction is to maximise the energy efficiency
of the new buildings: Wraptite airtightness membrane, the only self-adhering
vapour permeable air barrier certified by the BBA, will form a crucial part of the
solution.
The inclusion of Wraptite within the facade will ensure “as-designed” performance,
narrowing the gap between as-designed and actual energy performance and
reducing the likelihood of potential failures to meet required airtightness levels.
Wraptite is a self-adhesive breather membrane applied externally, quickly and
efficiently as part of the rainscreen system. The self-adhesive Wraptite membrane
fully bonds directly to the substrate, requiring no mechanical attachment and little
seals or tapes to suppress air leakage around junctions or penetrations.
Wraptite combines the critical properties of vapour permeability and airtightness
in one self-adhering membrane, providing high levels of protection to the building
fabric beneath the cladding. As a result, the Wraptite system allows the substrate
beneath to dry quickly and moisture vapour to escape and reduces the likelihood
of mould, mildew, condensation, timber distortion and metal corrosion.
Wraptite is compliant with Part B regulation changes and also has BBA approval
for unrestricted use in buildings over 18m in England and 11m in Scotland.
Wraptite®
State-of-the-art college to benefit from superior airtightness
Brochures
Datasheets
Installation Guides
Material Properties
BIM Objects
UK Availability
Certification
Global Availability
Material Properties
Wraptite-SA
| Property | Test Method | Result |
|---|---|---|
| Roll Size | 1.5 x 50 m | |
| Thickness | Calibrated Deadweight Micrometer | 0.65 mm |
| Weight | Electronic Weigh Scale | 292 g/m2 |
| Application Temperature - Air & Surface Minimum | -10 C | |
| Service Temperature | -40 to 80 C | |
| Water Penetration - Before Ageing | EN 1928:2000 Method A | W1 Class |
| Water Penetration - After Ageing | EN 1928:2000 Method A | W1 Class |
| Air Permeance | EN 12114 | 0.01 m3/m2/hr @50Pa |
| Water Vapour Resistance Sd | EN ISO 12572(C) | 0.039 m |
| Water Vapour Transmission | BS 3177:1959 | 893 g/m2/24hr |
| Peel Adhesion | EN 1939 | 5.01 N/10mm |
| Tensile Strength - MD | EN 12311-1 | 417 N |
| Tensile Strength - XD | EN 12311-1 | 252 N |
| Tear Resistance - MD | EN 12310-1 | 412 N |
| Tear Resistance - XD | EN 12310-1 | 286 N |
| Dimensional Stability - MD | EN 1107-2 | 0.3 % |
| Dimensional Stability - XD | EN 1107-2 | +0.1 % |
| Reaction to Fire | EN 13501 - 1 | B Class |
| Flexibility at Low Temperature | EN 1109 | No cracks at -40C |
BIM Objects
| File | Format |
|---|---|
| Wraptite - BIM Object - Steel Frame | IFC |
| Wraptite and Facadeshield UV - BIM Object - Steel Frame | IFC |
| Wraptite - BIM Object - Steel Frame With Reflectite Tape Over Board Joints | IFC |
| Wraptite - BIM Object - Steel Frame Wraptite Tape Over Board Joints | IFC |
| Wraptite - BIM Object - Wraptite Tape Over Board Joints | IFC |
| Wraptite - BIM Object - Ventilated Timber Frame With External Airtight Membrane Wraptite | IFC |
| Wraptite - BIM Object - Ventilated Timber Frame With External Airtight Membrane And Wraptite Tape Over Board Joints | IFC |
| Wraptite - BIM Object - Warm Roof Slate With Softwood Sarking | RVT |
| Wraptite - BIM Object - Warm Roof Tile With Plywood Sarking | RVT |
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