![]() On below-grade foundations, let cure at least 24 to 48 hours, with good air circulation, beforeĮxposure to water or backfilling. Drying will be slower, 2 to 7 days, in cool, damp weather. If walls are to receive hard wall plaster, use furring strips or metal lath.ĭrying: Usually 8 to 12 hours in warm, dry weather. Apply product in 1 coat, carrying the coat in and around all joints, grooves and slots, following all reveals and soffits of windows andĬontinuing 12″ out on adjoining partitions and soffits. HE789 – FIB ASPHALTĮMULSION DAMPPROOFING is compatible with masonry, concrete, CMU, and gypsum sheathing. Interior Surfaces Above Grade – Weather Resistive Barrier: HE789 – FIB ASPHALT EMULSION DAMPPROOFING is used for dampproofing the exterior face of interior walls in cavity wall construction. Allow to set and then backfill as previously described. Apply 1 to 2 coats of HE789 – FIB ASPHALT EMULSION DAMPPROOFING as described under Dense Surfaces. Within 24 hours, apply an additional coat of HE789 – FIB ASPHALT EMULSION DAMPPROOFING and allow to set for at least 24 to 48 hours and backfill as previously described.Ĭ) Parge Coat System: Apply a parge coat of cement mortar to the block wall, carrying the parge coat from the bottom of the footings to grade level and forming a cove at the junction of the wall and footing. Within 2 hours, apply Henry # 183 Glass Fabric membrane over all surfaces of coating, overlapping edges at least 3 to 4″. Allow to set 24 to 48 hours before backfilling as described previously.ī) Membrane system: For severe conditions or added protection, apply a base coat followed by a coat of HE789 – FIBĪSPHALT EMULSION DAMPPROOFING as described above. Allow base coat to dry to tacky touch and apply 1 coat of HE789 – FIB ASPHALT EMULSION DAMPPROOFING as described under Dense Surfaces. Bring the coating to finish grade.ĭampproofing of Exterior Surfaces Below Grade – Porous Surfaces: For dampproofing of porous surfaces such as concrete block, 3 alternate techniques are equally effective (base your selection upon local preference and the availability of equipment).Ī) Two Coat System: Apply a base coat of HE789 – FIB ASPHALT EMULSION DAMPPROOFING, cut 20% by volume with clean water, over entire prepared surface. Spread around all joints, grooves, and slots and into all chases, reveals, and soffits. Carry coating over exposed top and outside edge of footing. Fill in all crevices and grooves, making sure coating is continuous and free from breaks and pinholes. Apply each coat at 2 to 3 gallons per 100 square feet, allowing the first coat to dry before applying second coat. ![]() If applying by spray or for severe conditions, two coats are preferable. material hose from the pump gun is preferred for most applications.ĭampproofing of Exterior Surfaces Below Grade – Dense Surfaces: For dense concrete surfaces not subject to hydrostatic pressure, a single coat of Henry 789 – FIB ASPHALT EMULSION DAMPPROOFING, approximately 1/16″ in For spraying, use Graco 9:1 ratio pump, or equal, capable of delivering 3 – 5 gallons per minute, and a pole gun with 1/8″ – 1/4″ tip. For best results keep brush strokes in one direction and apply additional coats at a right angle to the former coat. Apply with a soft bristle brush or heavy duty spray equipment. A tighter bond will result if surface is damp when coating is applied. Made from selected asphalt, emulsified with bentonite clay, non-asbestos fibers, and water. Above grade, Henry 789 provides a moisture barrier used for damppoofing the exterior walls in cavity wall construction. Henry 789 Fiber Asphalt Emulsion Damproofing is designed for damproofing the exterior side of below grade foundations and walls.
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