SikaShield® HB79 MG 4 mm

• Meets or exceeds the ASTM D6163, Type I, Grade G
• Underwriters Laboratory (UL)
• FM Global
• SikaShield® Pure-Air is certified according to the Photocatalytic Performance ISO 22197-1, D-tox, Nr. 25062020

Composite inlay of a fiberglass matt compressed between two layers of non-woven spunbond polyester fabric

36 months from the date of production

The Product must be stored in original unopened and undamaged packaging in dry conditions and temperatures between 41°F (5°C) and 95°F (35°C). Store in a vertical position. Do not stack pallets of the rolls on top of each other, or under pallets of any other materials during transport or storage. Always refer to packaging.

Mineral Granules:

• Regular white
• High Reflective White
• Pure-Air (Smog Reduction)

Refer to the price list for color variations.

Max. 80 %

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.

ALIGNMENT

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.

1. Unroll the membrane.
2. Align the membrane.
3. Re-roll the membrane before application.

MEMBRANE OVERLAPS

1. Overlap the membranes by a minimum of 4" (100 mm) on the sides and 6" (150 mm) on each end or as specified by the supplier.
2. At the end overlap, cut off a corner measuring 4" (100 mm) per side at an angle of 45°.

TORCHING

1. Heat the substrate and the backing film on the underside of the membrane with a gas burner.
2. When the backing film starts to melt, the membrane is ready to stick.
3. Roll the heated membrane forward and press it firmly against the substrate to bond it.
4. 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

HOT ADHESIVE BONDING (MOPPING)

Apply the hot melt at the required consumption onto the surface.

1. Note: Refer to the individual Product Data Sheet of the hot melt adhesive.
2. Apply the membrane onto the hot melt while still hot.
3. Roll the surface of the applied membrane with a roller from the center to the edge to remove any air
   bubbles.
4. Seal the overlaps with hot melt or by torching.

Suitable substrates for mopping

• Concrete
• Bituminous membranes with a smooth surface
• Coatings (check the compatibility)
• Brick masonry
• Cementitious screeds

NOTE: Different hot melt products are compatible with this membrane. Contact Sika® Technical Services for
information on choosing the right one for your project.

 COLD ADHESIVE BONDING

1. Apply the recommended adhesive at the required consumption onto the surface.
2. Apply the membrane onto the adhesive while still fresh. It cannot be cured.
3. Roll the surface of the applied membrane with a roller from the center to the edge to remove any air bubbles.
4. Seal the overlaps with hot melt or by torching.

Suitable substrates for cold adhesion

• Concrete
• Metal
• Perlite screed
• Bituminous membranes with a smooth surface
• Brick masonry
• Cementitious screeds
• Plasterboards
• Plasters

FASTENING

When used as a roofing sheet, the membrane can be mechanically fixed to the substrate by using the correct type of fasteners.

The number of fixings, type and position depend on wind uplift forces to be resisted, pull-out strength of the fixing screws, the elastic limit of the membrane and the appropriate safety factors.

Contact Sika Technical Service for additional information.

Suitable substrates for fastening

• Concrete
• Wood
• Metal
• Perlite screed
• Bituminous membranes
• Coatings (check the compatibility)

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.