SikaShield® VB P42 S 3 mm
SikaShield® VB P42 S 3 mm is an APP modified bituminous roofing vapor control layer with a thickness of 3 mm and flexible at -10 °C. It is reinforced with glass fibre to provide a barrier to the passage of vapour. The top surface is covered with sand to improve the bonding of the overlying layer or to bond the insulation boards with cold adhesives or by mechanical fixation. The underside of the product has a burn-off film for easy torch-application.
- Vapour diffuser and waterproofing incorporated in the same membrane
- High resistance to water vapour movement
- Easy to install by torching method
- Fully bonded
- Good durability
Usage
The Product is used as a waterproofing membrane for:- Flat and sloped roofs
- High humidity roof spaces ( +20 °C ≤ 80 % RH )
- Vapour control layer
- Base sheet in multi-layer systems
- The Product is not suitable for roofs permanently exposed to UV radiation.
Advantages
- Vapour diffuser and waterproofing incorporated in the same membrane
- High resistance to water vapour movement
- Easy to install by torching method
- Fully bonded
- Good durability
Packaging
Roll width | 1.0 m |
Roll length | 10.0 m |
Refer to the current price list for available packaging variations.
Colour
Top surface | Sand |
Bottom Surface | Polyethylene foil |
Product Details
APPROVALS / STANDARDS
CE marking and declaration of performance based on EN 13707:2004+A2:2009 Flexible sheets for waterproofing — Reinforced bitumen sheets for roof waterproofing — Definitions and characteristics
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
Chemical Base
Composition | APP modified bitumen |
Reinforcing material | glass fibre |
Shelf Life
36 months from date of production
Storage Conditions
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.
Effective Thickness
Effective thickness | 3.0 mm ± 0.2 mm |
Resistance to Tearing (nail shank)
Longitudinal (MD) | 70 N ± 21 N |
Transversal (CMD) | 70 N ± 21 N |
Joint Shear Resistance
Longitudinal (MD) | 300 N/50 mm ± 60 N/50 mm |
Transversal (CMD) | 200 N/50 mm ± 40 N/50 mm |
Flexibility at low temperature
≤ -10 °C | (EN 1109) |
Water Tightness
Method B, 24 hours at 60 kPa | Pass |
Diffusion Resistance to Water Vapour
Resistance factor, Method B, tested at +23 °C and 75 % r.h. | µ = 100 000 ± 20 000 |
Reaction to Fire
Class E | (EN 13501-1) |
Application
Ambient Air Temperature
Maximum | +40 °C |
Minimum | +5 °C |
Relative Air Humidity
Maximum | 80 % |
Substrate Temperature
Maximum | +40 °C |
Minimum | +5 °C |
SUBSTRATE QUALITY
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.
If used as a roof system, the complete system must be designed to withstand and be secured against wind uplift loadings.
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.
SUBSTRATE PREPARATION
PRIMING
Primer selection
Note: For information on selecting the appropriate primer, contact Sika technical service.
- Apply the appropriate Sika® primer with the required consumption onto the prepared dry surface.
- Note: Refer to the individual Product Data Sheet
of the primer.
- Note: Refer to the individual Product Data Sheet
- Allow the primer to dry before membrane installation.
APPLICATION
IMPORTANT
Unrolling at low temperatures
At low temperatures, the membrane becomes less flexible.
- Be careful when unrolling to avoid damaging the membrane.
IMPORTANT
Damage through footwear
Footwear with spikes or sharp protrusions may puncture the membrane.
- Use footwear with a flat profile when walking over the membrane.
IMPORTANT
Damage through overheating
The polyester melts at +260 °C. If it is damaged through overheating, the membrane becomes unusable.
- Keep moving the flame while torching to avoid overheating the membrane.
IMPORTANT
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.
- If the membrane does not adhere to other elements, lift and retorch the unbonded areas.
IMPORTANT
Application at less than +5 °C
When applying the membranes at temperatures lower than +5 °C, use heating equipment to ensure that the substrate temperature is within the given temperature range.
IMPORTANT
Application on sloped surfaces
For slopes with an inclination greater than 15 %, multi-layered roofs must be carefully designed and, if necessary, integrated with mechanical fastenings.
Seasonal symbol
Note: If a seasonal symbol is printed on the roll’s label, it is advisable to use the membrane during the indicated season.
Tackiness at high temperatures
Note: When laying the membrane at high temperatures, the integral adhesive will become 'tacky' and may restrict laying operations.
ALIGNMENT
IMPORTANT
Avoid coinciding joints
To avoid coinciding joints, lay the membranes parallel to one another. When applying on another bituminous membrane, make sure to straddle the overlaps of the previous layer.
- Unroll the membrane.
- Align the membrane.
- Re-roll the membrane before application.
MEMBRANE OVERLAPS
- Overlap the membranes by a minimum of 100 mm on the sides and 150 mm on each end or as specified by the supplier.
- At the end overlap, cut off a corner measuring 100 mm per side at an angle of 45°.
DETAILING
- Use a sharp knife to cut in all details such as internal and external corners, upstands, vent pipes, drains, support metalwork etc.
Refer to the relevant method statement for further information on detailing.
TORCHING
- Heat the substrate and the backing film on the underside of the membrane with a gas burner.
-
When the backing film starts to melt, the
membrane is ready to stick.
-
- Roll the heated membrane forward and press it firmly against the substrate to bond it.
- 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
-
Perlite screed
-
Bituminous membranes with a smooth surface
-
Coatings (check the compatibility)
-
Brick masonry
-
Cementitious screeds