EIFS Repair

REPAIR
Class Polymer Based (PB) Systems
Quality Assurances
· Mechanics must be qualified and experienced.
· Not a “Blow and Go” operation.
· Highest degree of workmanship.
· Follow exact procedures.
· Time to execute each step precisely.
· Blend edge of repair precisely as possible.
· Match the texture of repair with surrounding.
Materials
· Insulation board same standards as original from approved manufacturer.
· Reinforcing mesh same as original.
Hot Knife Repair Method
Rational
· Intended to make repair easier, less visible and least disturb surrounding
lamina and finish.
· Simplifies repair by eliminating task of removing original finish from area
surrounding and provide clean straight edge to blend new finish into the
original.
Procedure
· Precisely lay out repair area.
· All lines straight and true with corners square.
· Precisely cut out the area.
· Use straight edge to maintain neat, straight, and true cuts.
· Remove lamina and insulation board.
· Remove all original adhesive with care not to damage substrate.
· Ensure substrate is clean and undamaged.
· Insert hot knife blade just behind the lamina and carefully melt out cavity in
insulation board 3” wide (deep) behind area by 1/8” to 3/16” deep (wide) for
placing base coat and mesh.
· Take care not to disturb flat plane of existing lamina.
· Cut a piece of mesh of size to ensure a 2 ½” lap behind original lamina and
onto face of insulation board.
· Precisely mask surrounding finish to protect from damage.
· Using an appropriate tool, place base coat into void created by hot knife.
· Insert mesh into void leaving a minimum of 2 ½” exposed to lap into face of
insulation board.
· Cut piece of insulation board and sand to fit as tight as possible and apply
adhesive to back of insulation board.
· DO NOT apply adhesive to edges of insulation board!!!!!!
Place insulation board flush.
· Install slivers – no gaps.
· Cut a piece of mesh to ensure 2 ½” lap.
· Ensure masking in place.
· Apply base and embed mesh.
· Surface smooth and free of trowel marks.
· Allow base coat to fully cure.
· Check masking to ensure placement.
· Check finish color match by comparing dry sample with existing.
· Use manufacturer tech services for color match as they have
spectrometers.
· Apply finish coat to repair area and texture to match existing.
· Feather edges of repair.
· Use a brush, nail, toothpick or similar tool to blend edges of repair and
precisely match texture with surrounding area.
· Proper execution of this step is critical to success of repair.
Final Thought
· Slight color variation may exist after repair has dried.
· Color variation should be minimal if proper “dry to dry” color matching has
been accomplished.
Traditional Repair Method (Class PB & PI)
Rational
· Requires removal of finish surrounding repair area to expose reinforced base
coat.
· Can lead to repair area being out of plane with surrounding area making it
more difficult to blend repair.
Procedure
· Precisely lay out area.
· Cut and remove lamina in larger area.
· Using a disk grinder with diamond blade, expose reinforced base coat
approximately 3” around repair area.
· Cut and carefully remove insulation board taking care not to damage
substrate.
· Remove all original adhesive and debris.
· Cut and tightly fit board into opening.
· Sliver gaps as necessary.
· Apply adhesive to back of board without any on edges.
· Place insulation board flush.
· Mask surrounding area.
· Cut mesh to cover repair area and lap minimum 2 ½” onto original base coat.
· Apply base coat to face of insulation board with care to keep base coat off
edge of surrounding finish.

· Embed reinforcing mesh.
· Ensure mesh is fully embedded and base coat is smooth and free of trowel
marks.
· Allow base coat to fully cure.
· Check masking to ensure placement.
· Check finish color match by comparing dry sample.
· Use manufacturer tech services for color match as they have
spectrometers.
· Apply finish coat to repair area and texture to match existing.
· Feather edges of repair so they blend with surrounding area..
· Use a brush, nail, toothpick or similar tool to blend edges of repair and
precisely match texture with surrounding area.
· Proper execution of this step is critical to success of repair.
Final Thought
· Slight color variation may exist after repair has dried.
· Color variation should be minimal if proper “dry to dry” color matching has
been accomplished.
Direct Applied Exterior Finish (DEFS) System
Procedure
· Precisely lay out repair area.
· All lines straight and true with corners square.
· Precisely cut out the area.
· Using a disk grinder expose the reinforced base coat approx. 3 inches around
the repair area.
· Cut a piece of mesh of size to ensure a 2 ½” lap behind original lamina of
insulation board.
· Precisely mask surrounding finish to protect from damage.
· Cut a piece of mesh to ensure 2 ½” lap.
· Ensure masking in place.
· Apply base and embed mesh.
· Surface smooth and free of trowel marks.
· Allow base coat to fully cure.
· Check masking to ensure placement.
· Check finish color match by comparing dry sample.
· Use manufacturer tech services for color match as they have
spectrometers.
· Apply finish coat to repair area and texture to match existing.
· Feather edges of repair.
· Use a brush, nail, toothpick or similar tool to blend edges of repair and
precisely match texture with surrounding area.
· Proper execution of this step is critical to success of repair.

Final Thought
· Slight color variation may exist after repair has dried.
· Color variation should be minimal if proper “dry to dry” color matching has
been accomplished.
Portland Cement Based Plaster Finish
Procedure
· Requires removal of finish surrounding the repair area to expose base coat
plaster.
· Can lead to repair area being out of plane with surrounding area making it
more difficult to blend the repair.
· Precisely lay out repair area.
· All lines straight and true with corners square.
· Precisely cut out the area.
· Using a disk grinder expose the base coat plaster approx. 3” around the repair
area.
· Repair the base coat plaster.
· Remove all dust, dirt or other residue.
· Precisely mask surrounding finish to protect from damage.
· Check finish color match by comparing dry sample.
· Use manufacturer tech services for color match as they have
spectrometers.
· Consider fogging repair area with clean water before applying finish coat.
· Apply finish coat to repair area and texture to match existing.
· Feather edges of repair.
· Use a brush, nail, toothpick or similar tool to blend edges of repair and
precisely match texture with surrounding area.
· Proper execution of this step is critical to success of repair.
Final Thought
· Slight color variation may exist after repair has dried.
· Color variation should be minimal if proper “dry to dry” color matching has
been accomplished.

Contact Rob Santana