HS Butyl Polyband

• Prevents air leakage through lap joints to conform with the requirements of Approved Document L2:2006.
• Can be applied in cold conditions without reduction in long-term performance.
• Reduces condensation in built-up metal roofing systems by effectively sealing the metal liner to conform with the requirements of the Building Regulations Approved Document L2:2006.
• Unique high tack adhesive for instant grab.
• Special high-strength, non-tear laminated film.
• Outstanding adhesion to coated steel and aluminium sheets without the need for primers.
• Supplied in self-wound rolls for easy application.
• Very low moisture vapour transmission rate.
• Predicted service life can exceed 20 years.

Surface preparation

• All surfaces should be clean, dry, and free from frost, grease, and loose materials.
• When cleaning contaminated substrates, HS Butyl recommends using propan-2-ol (IPA) and allowing it to dry before applying the butyl tape.

Application

• Apply directly from the reel onto one surface and press along its entire length to achieve good initial adhesion.
• The use of a roller with firm pressure is recommended to roll the joint and ensure a good bond.

• A high performance air seal and moisture barrier tape developed especially for sealing side lap joints of metal roof and wall liners to reduce condensation and increase airtightness in buildings.
• Polyband® can be used as recommended in the MCRMA Technical Paper No.14 Guidance for the Design of Metal Roofing and Cladding to comply with Approved Document L2:2006.
• Polyband® can be used on purlins to prevent cold-bridging.
• Polyband® can be used to separate different metal components to prevent bimetallic corrosion.
• Care must be taken to seal the joints at the eaves, ridge, and any pipe or service penetrations in order to provide a completely airtight building.
• The use of GCA® preformed butyl sealant is recommended for sealing between the end laps of liner trays.
• Polyband® can be used to seal sidelaps in steel decking.
• Polyband® can be used to overtape joints in vapour control layers.

• Polyband® has been independently tested by the Building Research Establishment for sealing metal liners in a built up roofing system (Report No. 16573; 4/2/00).
• Its performance in reducing the passage of moisture vapour was compared with transmission rates obtained for unsealed liners both with, and without a vapour barrier membrane.
• The tests demonstrated that when used as recommended, Polyband® was approximately 50% more effective as a barrier to the passage of moisture vapour than a conventional vapour control layer (VCL).

Polyband® conforms with the following for the sealing of side lap joints:-

• MCRMA Technical Paper No. 14 - Guidance for the Design of Metal Roofing and Cladding to Comply with Approved Document L2:2006.
• The report recommends that side and end laps/joints and all perimeter joints should be effectively sealed, not only to reduce air leakage to a very low level, but also to provide vapour control.

Approved Document L2:2006, Section 1, Elemental Design Method (Summary).

Thermal bridging at junctions and around openings:-

• 1.9 Construct the building fabric so that there are no significant thermal bridges or gaps in the insulation layer(s) within the various elements of the fabric, at the joints between elements and at the edges of the elements.
• 1.11 Adopt robust design practices illustrated in MCRMA Technical paper No. 14 and BRE Information Paper IP 17/01

Building Air Leakage Standards:-

• 1.17 Buildings should be reasonably airtight to avoid unnecessary space heating and cooling demand and to enable the effective performance of ventilation systems.
• 1.19a Provide reasonably continuous air barrier in contact with the insulation layer over the whole thermal envelope (including separating walls). Guidance for the design
   

HS Butyl Membrane Tape is supplied as a self wound reel. Standard: 1mm x 50mm x 35m - 6 rolls per box

24 months when stored flat in original packaging in cool, dry conditions.