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Packaging:
5 gallon pails, 55 gallon drums .

Sikagard ® 535
Liquid Applied, Single Component, Acrylic Vapor Permeable Air Barrier

Description

Sikagard 535 is a low VOC, single component, liquid applied, elastomeric membrane designed to provide a vapor permeable air and water barrier when applied to above-grade wall assemblies. It is acrylic-based and cures to a tough monolithic rubber-like membrane that resists air leakage and water penetration when applied to plywood and gypsum sheathing, concrete and concrete masonry units.

Where to Use

To be used in conjunction with Sika ® MultiSeal ® 515 Self-Adhered Transition Seam Tape and Sikaflex 11FC. Acceptable substrates are above grade exterior wall substrates including precast concrete, cast-in place concrete, concrete block, primed steel, aluminum mill finish, anodized aluminum, galvanized metal, gypsum board and wood.

Advantages

  • Low odor, low VOC.
  • Seamless, elastomeric membrane for above grade wall applications.
  • Easy to install, cost effective brush, roller or spray application using common spray equipment.
  • UV Stable for 6 month exposure.
  • Water vapor permeance allows wall assemblies to dry out.
  • Excellent adhesion to common construction surfaces.
  • Meets industry performance standards to control air movement.
  • Low surface burning characteristics as appropriate for compliance with NFPA 285

Coverage

Apply at a rate of 100 sf per gallon to achieve a uniform wet film thickness of 16 mils.

How to Use

Surface Preparation

Surfaces must be sound, clean, dry and free of frost, dirt, dust, loose concrete, grease, oil, contaminants or other foreign matter that may adversely affect the adhesion of the liquid applied vapor permeable air and water barrier membrane. Surfaces should be sound, free of voids, gaps, breaks and spalled areas. New concrete should be cured for a minimum of 14 days before Sikagard 535 Liquid Applied Acrylic Vapor Permeable Air Barrier is applied. Acceptable substrates are precast concrete, cast-in place concrete, concrete block, primed steel, aluminum mill finish, anodized aluminum, galvanized metal, gypsum board and wood. Joints between panels of exterior grade gypsum and plywood up to 1/4 inch (6 mm) wide shall be treated with a 1/16 inch (3 mm) deep x 3/4 inch (19 mm) wide cap bead application of Sikaflex ® 11FC. Joints between panels of exterior grade gypsum or plywood wider than 1/4 inch (6 mm) shall be sealed with a strip of Sika ® MultiSeal 515 Self-Adhered Transition Seam Tape aligned over the joint and applied to a substrate primed with Sikagard ® 510 Transition Seam Tape Primer. Apply sufficient pressure to self-adhered transition seam tape to ensure adhesion to substrate. Strike masonry mortar joints full flush. Cracks in masonry and concrete up to 1/4 inch (6 mm) wide shall be sealed with a cap bead application of Sikaflex 11FC. Cracks in masonry and concrete up to 1/8 inch (3 mm) wide may be filled with a trowel application of liquid air barrier membrane and allowed to cure overnight prior to field application of the liquid air barrier membrane to surface. Cracks wider than 1/4 inch should be re pointed. Transition joints between dissimilar materials at beams, columns, window and door frames, etc., should be sealed with a strip of Sika ® MultiSeal 515 Self-Adhered Transition Seam Tape aligned over the joint and applied to a substrate primed with Sikagard ® 510 Transition Seam Tape Primer. Apply sufficient pressure to self- adhered transition seam tape to ensure adhesion to substrate. Provide minimum of 2 1/2 inches (63 mm) of membrane bearing on each adjacent surface. Mechanical fasteners used to secure sheathing boards or penetrate sheathing boards prior to membrane application shall be set flush with sheathing board and fastened into solid backing. Thinning of the liquid membrane is not permitted.

Mixing

Stir liquid membrane thoroughly prior to application.

Application

Sikagard 535 ® may be applied by brush, roller or spray. Application by conventional air assisted spray equipment in a single or dual-coat application is the preferred method. Apply liquid air barrier membrane in a continuous, monolithic application pattern to achieve a uniform coating of permeable air and water barrier membrane. Monitor applications to measure wet mil thickness and avoid creating sags or runs. Pretreat outside corners, wall openings and mechanical penetrations with Sika ® MultiSeal 515 Self-Adhered Transition Seam Tape. Apply liquid air barrier membrane to fully cover transition membrane applications. Tie-in to structural beams, columns, floor slabs and intermittent floors, parapet curbs, foundation walls, roofing systems and at the interface of dissimilar materials with Sika ® MultiSeal ® 515 Self-Adhered Transition Seam Tape and or approved flashing membrane. Mark areas off and ensure that the appropriate volume has been applied over each area. During spraying, the product should be applied in horizontal strokes, then vertical strokes in a cross-hatch method to ensure even application. Spray applications must be immediately back-rolled. Protect wall areas covered with Sikagard 535 Liquid Applied Acrylic Vapor Permeable Air Barrier from damage due to construction activities, high wind conditions, and extended exposure to inclement weather. Review condition of Sikagard ® 535 Liquid Applied Acrylic Vapor Permeable Air Barrier prior to installation of cladding. Repair, or remove and replace damaged sections with new membrane. Recommend to cap and protect exposed back-up walls against wet weather conditions during and after application of membrane, including wall openings and construction activity above completed water-resistive vapor permeable air barrier installations.

Limitations

  • Minimum age of SikaTop ® or MonoTop ® prior to application is three days, depending on curing and drying conditions (moisture content must be below 5%).
  • Sikagard 535 should not be applied at relative humidity greater than 90%, or if rain is forecast within the specified rain resistance period.
  • When over-coating existing coatings, compatibility and adhesion testing is recommended.
  • Do not store Sikagard ® 535 in direct sunlight for prolonged periods.
  • Strong winds can cause shrinkage if material is applied at lower temperatures.
  • Not recommended for roofing.
  • Precautions should be taken to prevent odors and/or vapors from entering the building/structure, including but not limited to turning off and sealing air intake vents or other means of ingress for odor and/or vapors into the building/structure during product application and cure.