Metal-film-protected bitumen and butyl flashing tapes for roof, wall and pipe-penetration details, plus self-sealing waterproofing membranes for building envelopes.
| Property | Class B | Class 0 same values |
|---|---|---|
| Cell structure | Closed cell | — |
| Material | Bitumen / butyl + metal film | — |
| Density | 65 kg/m³ standard · 55–90 kg/m³ to order | — |
| Thermal conductivity λ at −20 / 0 / +40 °C | 0.030 / 0.032 / 0.037 W/(m·K) | 0.030 / 0.032 / 0.037 W/(m·K) |
| Water vapour permeability | 1.96 × 10⁻¹¹ g/(m·s·Pa) | — |
| Moisture resistance factor μ | ≥ 10,000 | — |
| Oxygen index | ≥ 32 % | — |
| Flammability / smoke density | Self-extinguishing / smoke density 25–50 | — |
| Water absorption | ≤ 5 % | — |
| Service temperature | −57 °C to +125 °C | — |
| Flexibility / ozone resistance | Excellent / no crack | — |
| Form | Tape and self-sealing membrane | |
| Use | Roof, wall, pipe penetration | |
Values are nominal production figures, tested per batch. Density, wall thickness and colour are produced to the customer's specification.
— means the value is identical for Class B and Class 0.
Inner diameter 6–89 mm (1/4″–3-1/2″) · wall thickness 6–50 mm (1/4″–2″). Intermediate sizes produced on request.
Bitumen and butyl tapes with a metal-film facing, plus self-sealing membrane — for the details that leak first on a building: roof edges, wall junctions and pipe penetrations.
Edges, upstands and junctions where two planes meet and movement is inevitable. The metal-film facing takes UV and mechanical wear while the butyl or bitumen layer stays flexible underneath.
Where a wall meets a roof, a parapet or a change of material — the places a renderer or a roofer cannot make watertight with a sealant alone.
Around penetrations through roof or wall, where the seal has to accommodate thermal movement and the pipe's own vibration rather than being rigid.
Self-sealing membrane closes around minor punctures and fasteners, which is why it is used under fixing points and on repair work rather than only on new details.
Both are metal-film faced and both are self-adhesive. The difference is the adhesive mass and where it belongs:
Watertightness: the membrane closes around minor punctures and stays flexible long term, but service life depends on the substrate, the exposure and whether the detail is protected. On UV-exposed roof details we recommend keeping the metal facing intact or covering the detail — exposed adhesive edges are where these fail first.
The adhesive mass. Butyl has higher initial tack and stays flexible at lower temperatures, so it is the better choice for details that move or for cool-weather application. Bitumen is the more economical choice for large areas on mineral substrates. Both are faced with metal film.
It can, within limits: the adhesive has to remain able to flow and wet the surface. Butyl tolerates lower temperatures than bitumen. If your site is working at low temperature, tell us at enquiry and we will confirm the grade and the application condition rather than let the installer find out.
Service life depends on the substrate, the exposure and whether the detail is protected — there is no honest single number for that. The factors that decide it: intact metal facing, no exposed adhesive edge, correct surface preparation, and no standing water at the detail.
No. These are building envelope products for roof, wall and penetration details. They are not supplied for potable water contact or direct food contact, and should not be specified for those uses.
Send the inner diameter, wall thickness, class and quantity, or simply attach your BOQ. We quote FOB Shanghai as standard, EXW or CIF on request.
