The Marshall Building, part of the renowned London School of Economics
has been fitted with the Wraptite external air barrier system from the A.
Proctor Group.
Part of a winning design created by Grafton Architects, the impressive
10-storey building features pale stone cladding and is home to a series of
educational facilities including lecture theatres, offices, classrooms, and a
sports hall.
Specialist contractor, I & S Construction, Dartford consulted with the A.
Proctor Group’s technical team and selected the Wraptite air barrier to be
incorporated within the external wall cladding system.
Wraptite is the only self-adhering vapour permeable air barrier certified
by the BBA and combines the critical properties of vapour permeability
and airtightness in one self-adhering membrane. This approach saves on
both the labour and material costs associated with achieving the energy
efficiency demands in buildings.
Glenn Giddens, Project Manager of I &S Construction, commented: The
Wraptite self-adhesive membrane could be applied externally, quickly
and efficiently providing a high quality installation and robust through wall
cladding system, without the additional need for mechanical fixing required
using a standard membrane.”
Wraptite is Class B1-s1,d0, compliant with Approved Document B Building
Regulations for use in the external wall systems of buildings over 18m in
height, both as a continuous layer on sheathing board, behind fire classified
insulation, and for use to tape joints in insulation behind rainscreen.

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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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