A water-resistive barrier of 60-minute, Grade-D paper or have a water resistance equal to or greater than one layer of water-resistive barrier and, additionally, have drainage on the exterior side of the water-resistive barrier with a minimum efficiency of 90 percent. A space or drainage material not less than 3/16 inch (4 mm) in depth, applied to the exterior side of the water-resistive barrier.ī. The revised sections require that exterior walls constructed in moist and marine-climate zones, utilizing wood- based sheathing and stucco cladding, will require eitherĪ. They simply allow assembly to drain and dry. Drainage spaces and drainage materials essentially provide pressure relief and a pathway out. When exterior moisture enters a wall system, either by incidental moisture intrusion or inward vapor drive, hydrostatic and vapor pressures can build and drive moisture and vapor inwardly toward moisture sensitive materials. Modern wall assemblies with high levels of insulation and increased air tightness have removed two important drying mechanisms typically found in older construction: heat and air flow. The changes are aimed at increasing the assemblies draining and drying capacity These changes apply to stucco assemblies applied over wood-based sheathings in moist and marine climate zones. Use steel spatula for working final coats, for compacting the surface as much as possible, working downwards in fast cross-hatching style.The Higher Standard - 2021 Winter/Spring Issue 2021 IBC Update: Enhanced Drainage Requirements for Stucco WallsĮven though Washington and Oregon may be years away from formal adoption, the 2021 version of the International Code Council’s (ICC) International Building Code (IBC) has made important changes to section 2510 Lathing and Furring for Cement Plaster (Stucco). Thorough mixing and working are needed to disperse the pigment.Īpply the mix firmly but thinly on the wall over the dampened previous coat. Add pigment continuously bit by bit, testing the colour once mixed on board. Add lime compatible pigment (for example iron oxide) dissolving throughout the water first. Start working the putty lime on a wooden board until a smooth consistency - it can take up to twenty minutes to achieve thisĪdd marble dust and mix with the putty in proportions of one to one, until buttery smooth. Setup a board for working plaster, bucket for soap/lime mix and mixing utensils, plasterer's steel float and hawk, standard brush, soft well or wool rags for polishing Prepare marble dust, mature putty lime and lime compatible pigment How to make traditional polished and tinted stucco marmorino: The critical to a successful finish is achieving a flawless surface and applying smooth well-compacted coats as flat as possible as the polishing process magnifies every dent or irregularity. The finish coat can be troweled smooth, textured, smoothed to a sand finish or sprayed. The first two plaster coats are applied either by hand or sprayed. The traditional application of the decorative finish occurs at least in three coats. There are also synthetic versions of stucco that can be applied as one base layer and finish layer, which is faster to apply than traditional multi-coat stucco. Modern stucco is usually a mix of sand, Portland cement (a hydraulic cement made of pulverised hydraulic calcium silicates), lime, water and may contain additives such as acrylics and glass fibres to improve the structural properties.
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