Drainable EIFS stucco system by Rene Munoz Plastering LLC.

 
 

EIFS  stucco system  (Exterior Insulation Finishing System)  is used  a lot in commercial  projects  but can be use in residential. As the name suggest  EIFS system has been designed to provide the structure with  insulation, water resistant protection  and a finish surface, acrylic finishes such Parex, Total Wall, Senergy, Dryvit etc. are the most common stucco finishes for this stucco system. It can be applied over masonry walls, such concrete, stucco, brick and block,  materials like gypsum board tree-plywood sheathing and OSB. Depending on the surface or the project’s needs, a drainage plane such tyvek stucco wrap, a  liquid  air and water proof membrane or a mix of both  are  installed over the base surface  followed by the  installation of a 1 1/2″ minimum  EPS foam  using either cement base coat, mechanical fasteners or a mix of both, when installing the EPS foam with a cement basecoat it require the use of a notched trowel to create groves and gaps on the back of the EPS foam between the sheathing and the foam to make the system a draianble EIFS system. After the foam has been installed the EPS  foam is rasped to receive the application of the fiber glass mesh embedded in a cement base coat, this coat is allowed to dry and then the acrylic finish  texture is apply.

Rene Munoz Plastering offer different materials and process of this system based on your project and specific needs. No  property  is equal, we know  each property require  special attention when it comes to a drainable EIFS stucco and  water proofing system design, when designing and installing a drainable EIFS stucco system you can rest assured that we work with the best brands and materials in  the EIFS industry, we always strive to achieve longevity, functionality, elegance, beauty and protection of  which may be the biggest investment of  YOUR life (Home or business).

 

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1.-BASE SURFACE

EIFS system can be applied over masonry walls, such concrete, stucco, brick and block,  materials like gypsum board tree-plywood sheathing and OSB surfaces can be used as well. Wooden walls  or gypsum boards sheathing should be installed  continuously, positioning the boards horizontally. Home owner, framer and/or builder should leave a 1/8” space between the edges of the boards to allow for moisture expansion.

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2.-WINDOW OPENINGS

Windows are the number one reason why stucco 3 coats and EIFS system fail, window openings most be properly seal and prepare to withstand the water that may penetrate  the structure,  the material  used in this picture is specifically designed  to waterproof all rough openings.  Aquaflash, is embedded in a non-woven blend fabric to seal  the substrates around windows, it has been design to be a seamless transition between the window opening and the later to be applied  fluid apply  air and water-resistant barrier membrane. When is fresh it has a bluish/grayish color and when is  fully dry it turns black.

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3.-ALL SUBSTRATE JOINTS MOST  BE SEAL

When preparing the substrate for the  fluid applied air and water-resistant barrier membrane all joints  and window flanges (sides and top only)  most be meshed  with a fiber glass mesh dryvit grid tape  and  most be pre-touch with  the same liquid barrier membrane prior to do the actual application of the fluid applied air and water-resistant barrier membrane, this will reinforce the joints  between  the substrate and prevent future water penetration to the structure.

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4.-ALUMINUM FLASHINGS

Pre bent aluminum coated  or vinyl   flashing should be installed to protect the joint between the concrete and the wood framing, in a horizontal situation where one cladding meets another ( transition)  such stone and stucco. As part of the waterproofing system when installing this flashing a fiber glass mesh embedded in a coat of liquid barrier membrane most be apply prior to do the liquid barrier membrane over the entire walls.

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5.-DRAINAGE STARTER TRACK
Drainage starter track is a  UV treated PVC perforated “J” channel with weep holes, as the name suggest this piece will allow the water from the wall to drain out of the EIFS system through its weep holes, it  helps  to start  a new  EPS foam row and  also works as a guide  for  the EPS foam installation. As part of the waterproofing system when installing this material, fiber glass mesh embedded in  a coat of liquid barrier membrane  most be apply on top  prior to the application of the liquid barrier membrane over the entire walls. If this starter track is installed over an aluminum flashing whether is the roof or  floor level   it most be installed  a minimum of 3/4″ above   the flashing  to allow for future baker road and caulking application with properly spaced weep holes.

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6.-DRIP CAP FLASHING

Pre bent aluminum coated  or vinyl  drip cap flashing should be installed over the head casing of all windows and doors. As part of the waterproofing system when installing this material, fiber glass mesh embedded in  a coat of liquid barrier membrane  most be apply on top  prior to the application of the liquid barrier membrane over the entire walls.

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7.-DRAINAGE STRIP

Drainage Strip is  a corrugated high impact polystyrene material, which is used to provide drainage at the base of walls, floor line expansion joints and head casings of windows. This corrugated plastic is installed over the previously installed and sealed drip cap flashing to provide a proper drainage to the top of the  windows.

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8.-EDGES OF THE FOAM TO BE BACK-MESHED

All edges of the EPS foam most be back-meshed, mesh should  start from the back of the EPS foam wrap the edge of the foam and most be not smaller than 2″  on both, front and back side. This mesh later will be overlapped  to a layer of a thicker fiberglash mesh embedded in cement base coat that will cover the entire front side of the walls.

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9.-CAULKING SPACE/GAP

Everywhere EIFS  could be in touch with a dissimilar material, contractor should leave a gap for future  backer rod installation  and caulking of the joint to help with expansion and contraction as well as waterproofing of  the joint between  the two dissimilar materials.

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10.-CONTROL EXPANSION  JOINTS

Control expansion joints are also known as V-groves  but they can also have a rectangular and square shape depending on the specification of the project. V-grooves are designed to safely absorb the contraction and  vibration of the EIFS system and in many cases they are also use to enhance the beauty of the entire system by providing strategical lines through the walls. This details have to be  specified and planned prior to the installation of the  EPS foam to avoid having the V-gooves where two pieces of  foam connect.

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11.-KICK OUT FLASHING DIVERTER

This molded one piece  of plastic or welded one piece  of metal  most be installed where a vertical wall meets  the end of  a roof  near the fascia board where the gutter later is installed This is a critical location where moisture entry can do considerable damage Kick out flashing diverters  should be fabricated with watertight seems and most  be big and broad enough to handle water run-off from a variety of roof pitches. kick-out flashing should be installed under shingles and behind the existing roof flashing . It will help keep water from running down the EIFS stucco wall, add life to the original appearance of your stucco as well as protecting the existing frame from constant moisture. See our  latest  blog post  eight reason why stucco fail  or visit some our of remediation projects to find out the damages caused by a missing kick-out flashing diverter.

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12.-WATERPROOFING MEMBRANE

Also known as fluid applied  water resistant barrier membrane, Gold coat, liquid air and water resistant barrier membrane. This membrane is applied over the previously mention system to provide the structure with the necessary waterproofing, there are 2 versions, the roll on and the trowel  on, we prefer the trowel on material because of its thickness, a minimum of two coats of the membrane should be applied and let it cure prior to install the EPS foam.

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13.-VERTICAL  BASE COAT RIBBONS OF ADHESIVE

This  vertical base coat ribbons of adhesive are created by applying base coat at the back of the EPS foam  and the use of a stainless steel trowel with 3/8” wide, 1/2” deep  notches spaced no more then 1 1/2″. A critical step that creates a gap between the wall and the EPS foam making the system a TRUE drainable EIFS System.

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14.-EXPANDED POLYSTYRENE FOAM (EPS)

The word Styrofoam™ is often used to describe expanded polystyrene (EPS) foam; however, ‘Styrofoam’ is actually a trademarked term for closed-cell extruded polystyrene foam made for thermal insulation and craft applications. EPS foam is the correct term for any form of expanded polystyrene.

Expanded Polystyrene insulation is a lightweight, rigid, closed cell insulation.  This closed-cell structure provides minimal water absorption and low vapor permanence. When is used as the base for an EIFS system, this  foam should not be less then 1″ thick  and can not exceed 4″ thickness, 3/4″ may be used but is not recommended because later this material will be rasped/abraded.

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15.-RASPERING OR ABRADED OF  THE  EPS FOAM

EPS foam rasping practices serve 3  purposes,  the first is to  plumb and level  the surface, second, it can help to create various shapes and third  and most important  it creates a rough surface to help with the adhesion of the reinforcing mesh embedded in basecoat. If we compare EIFS system with an stucco 3 coats system   the rasping of the  EPS foam is what a   metal lath or scratch coat does before a brown coat is applied. We use a rasper or a home made level  with spikes to rasp the eps foam.

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16.-FIBERGLASS MESH EMBEDDED IN CEMENT BASE COAT

Reinforcement fiberglass mesh is embedded in  the adhesive cement base coat,  properly overlapped with the previous back-meshed fiberglass to reinforce the EIFS system and  to  serve as a base  for the  acrylic finish coat.

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16.-PRIMER ACRYLIC PAINT COAT

Primer acrylic paint is used as a base for the finish coat to enhance the colors and to not let the cement base coat defects interfere with the color of the finish coat and also to help  with the durability and enhancement of the final  acrylic color coat. The color of the primer will be base on the color of the finish coat, in this case a white color primer has been used because the final color is white.

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For more FAQ’s and as we already mention in our stucco services page . We don’t have a one system fits all,  we know each project is unique, with its own set of problems that require individual solutions. EIFS  itself is a great product,we have to keep in mind that what is protecting our investment from the elements is not the  EPS foam or acrylic coat it self, in reality what protect our investment is the  waterproofing  and water management system behind the stucco and that’s where we come into place and  that’s mainly  what set us apart from the rest.

Stucco and EIFS systems are claddings  of deceptive simplicity: in most cases its repair or installation should not be undertaken by a property owner unfamiliar with the art of plastering, home water proofing and exterior cladding installations. Successful stucco EIFS systems requires the skill and experience of a professional.

If  you  are  in need of a professional contractor, looking for an installer, an specialist,  experiencing stucco, siding or stone  problems, feel free  to contact us, we will be more  than   glad  to help you, answer  all your questions, take you by the hand to solve the moisture issues that your property may have, assist you  with your buying/selling situation or better yet educate you to  prevent any possible stucco & EIFS water damage.

 

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