SikaShield® VB P41 S 3 mm

CE marking and declaration of performance based on EN 13970:2004/A1:2006 Flexible sheets for waterproofing — Bitumen water vapour control layers — Definitions and characteristics.

24 months from date of production

The Product must be stored in original unopened and undamaged packaging in dry conditions and temperatures between +5 °C and +35 °C. Protect the Product from direct weather exposure and sunlight. Store in a vertical position. Pallets may be stacked on top of the rolls if all following conditions are met:

• The rolls have a wooden board on top, separating them from the pallet above.

• The weight of the pallet above is equal to or less than the weight of the rolls.

Always refer to packaging.

Sand surfaced.

SikaShield® VB P41 S 3 mm can be used as a temporary waterproofing layer for up to 4 weeks in accordance with the Product Data Sheet.

SYSTEM DESIGN

Consider the following when designing the system:

• The supporting structure must be of sufficient structural strength to support all new and existing layers of the system build-up.

• The complete system must be designed to withstand wind uplift.

SUBSTRATE CONDITION

The substrate surface must be uniform, firm, smooth and free of any sharp protrusion or burrs, clean, dry, free of grease, laitance, oil, dust and loosely adhering particles.

PRIMING

1. Apply the specified Sika® primer with the required consumption onto the prepared dry surface.
   • Note: Refer to the individual Product Data Sheet of the primer.
2. Allow the primer to dry before membrane installation.

IMPORTANT

Unrolling at low temperatures

At low temperatures, the membrane becomes less flexible.

1. Be careful when unrolling to avoid damaging the membrane.

Damage through foot traffic

Footwear with sharp protrusions may puncture the membrane.

1. Use footwear with a flat profile when walking over the membrane.

Damage through overheating

The polyester melts at +260 °C. If it is damaged through overheating, the membrane becomes unusable.

1. Keep moving the flame while torching to avoid overheating the membrane.

Reduced adhesion through insufficient heating

Make sure to heat the membrane sufficiently. If it is not sufficiently heated, the adhesion to the substrate, between layers or on the overlaps will be reduced.

Application on sloped surfaces

For slopes with an inclination greater than 5°, roofs must be carefully designed and, if necessary, integrated with mechanical fastenings.

ALIGNMENT

MEMBRANE LAPS

1. Overlap the membranes by a minimum of 100 mm on the sides and 150 mm on each headlap or as specified by the supplier.

DETAILING

1. Use a sharp knife to cut in all details such as internal and external corners, upstands, vent pipes, drains, support metalwork etc.

TORCHING

1. Heat the substrate and the backing film on the underside of the membrane with a gas torch.

   • When the backing film starts to melt, the membrane is ready to stick.

2. Roll the heated membrane forward and press it firmly against the substrate to bond it.
3. Make sure a bead of melted bitumen is visible along the full length of the overlap sides and ends when laying.

Suitable substrates for torching

• Concrete decks

• Existing bituminous roofs

• Brick/Blockwork

• Cementitious screeds

• Metal decks

Note: For other substrates, please contact Technical Services.