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building a stucco wall. for centuries, stucco has proven to be one of the mostenduring, versatile and weather-resistant exterior wallfinishes available...and with its variety of colors and textures, stucco continues to be one of the mostpopular wall systems. stucco can be applied over standard, woodframe walls in a three-coat process and over masonryand poured concrete walls in a two-coat application. beforestarting your project, check local building codes for wallassembly and moisture barrier
requirements in your area. weather-resistant stuccowalls require the use of two layers of grade d waterproof building paper overthe wall sheeting including plywood, osb, exteriorgypsum board and concrete board, before the applicationof the base coat stucco. when attaching the waterproof buildingpaper, vertical seams should be overlapped by 6inches or more and horizontal seams should be overlappedby 4 inches, in shingle fashion. the building papershould also extend 16 inches
around all corners. once the waterresistant building paper is in place, all trim accessories should be installed. trim accessories can be cut to sizeusing metal snips. cut edges are often very sharp, so alwayswear gloves when working with these materials. a weep screed is a typical excess willbe required by code. weep screeds are installed along thebottom edges to allow any water that has entered the wall to escape. casing beads should be installed to neatlyterminate stucco at the end of the wall.
casing beads also act as a guide to helpmaintain a consistent stucco thickness. casing beads, for a three coats system,should be three quarters of an inch thick. casing beads for use in a two-coatsystem over masonry or concrete should be 1/2 inch thick. then, galvanized expanded metal lath or 1 inchwoven wire stucco netting is installed over the entire surface,overlapping by one inch on the horizontal seams and two inches on the vertical seams.galvanized nails or staples should be
used every six inches, both vertically and horizontally. make surethat the nails or staples penetrate the studs a minimum of oneinch. the lath or stucco netting should also extend 16 inches around all corners. if the base coatstucco is applied to a clean unpainted concrete or masonry surface,waterproof building paper and metal lath are not required. then, control joints should be placed to createwall panels no larger than 144 square feet,
keeping the panels as square as possible.stucco will shrink as it hardens and cures. control joints help reduce the potentialfor shrinkage cracking. expansion joints are required anywherethere are existing wall expansion joints and at inside corners and changes insubstrate. expansion joints are designed to allowfor the expansion and contraction of the stucco wall panels with changes in temperature. corner trimshould be used on all outside edges, to protect the exposedstucco and to provide clean finished lines. now that the substrate isproperly prepared,
it is ready for the base coat stuccoapplication. quikrete base coat stucco and quikrete base coat stucco with water-stop are recommended for use in a traditional three coats system overwood sheeting and as the base for a two coat applicationover masonry or concrete. these pre-blended stuccos areextremely workable for hand applied stucco applications and have the high bond strength requiredfor a successful project. mix the base coat stucco to a workableconsistency. the proper consistency is achieved whenthe stucco will hang on a trowel
held at a 90 degree angle. stucco thatis mixed too wet will sag. stucco that is mixed too dry willnot adhere properly to the metal lath. one bag of 80 pound base coat stuccowill cover about twenty seven square feet at three-eighths of an inch thick. using asquare trowel, held at a 45 degree angle, apply the basecoat stucco using firm trowel pressure to force the stuccointo the lath. work from the bottom of the wall up andapply at a thickness of about three-eighths of an inch over theentire area. then,
using a straight edge or darby, screed thestucco to a uniform depth of 3/8 of an inch thick. once the stucco has become thumb print hard,scratch horizontal grooves, 1/8 of an inch deep, into the base coat, across the entirearea with a raking tool. this is why this step is commonlyreferred to as the scratch coat. allow the scratch coat to cure for 24 to48 hours. keep the surface of the stucco damp witha fine water mist. this step will help reduce shrinkagecracking, especially in hot dry
conditions. now, mix and apply another 3/8 inch layer of base coat stucco directly to thescratch coat. this step is called the brown coat. usinga straight board or darby, screed the brown coat surface to a trueeven 3/8 inch thickness. fill any surface boards withadditional base coat. the total combined base coat depthshould be three-quarters of an inch thick. as soon as the strucco has lost itssheen, float the surface uniformly. then, cure the base coat with a fine watermist for 24 to 48 hours.
for two-coat applications over masonryblock walls and poured concrete walls, the scratch coat step is eliminated fromthe process. simply dampen the wall. apply the browncoat. then, screed and float the surface to a uniform 3/8 inch thickness. now that the base coat is complete, quikrete finish coat stucco can be usedto provide numerous decorative color and texture options for your stucco wall. finish coat stucco is available in bothwhite and gray formulations and can be combined with more than 20standard quikrete stucco & mortar colors.
popular textures, such as heavy lace, lightlace, dash, sand float and smooth finishes areeasy to achieve with a little practice. working from the bottom of the wall tothe top, apply a consistent 1/8 inch thick coating of finish coatstucco. then, use a whisk brush to lightly dashfinish coat stucco onto the wall. then, use a trowel to knock down and flatten the stucco. if you prefer a heavier texture, firstspread the finish coat stucco in a thin application to achieve good colorcoverage, and then, double back with a heavieruneven application.
once the heavy coat begins to hardenknock the finish down with a trowel, creating a heavy lace finish. if asmooth finish is your preference, simply use a trowel or sponge float in acircular motion. it is important to complete the entirewall in one application. this will help limit any colorinconsistencies from batch to batch. then, keep the surface damp for severaldays by applying a fine water mist.