The first requirements for good performance are proper stud selection and spacing as well as proper sheathing installation. As an example, gapping edges
The second, and probably most important requirement for protection from water intrusion is complying with flashing and weather-resistive barrier code requirements. The third requirement for effective performance is proper lath and accessory installation. Correct methods for installing lath are covered in ASTM C 1063-86. Many common installation errors stem from a failure to understand the distinction between control joints and expansion joints, and how they are applied
The fifth factor in basecoat performance is how well the basecoat is moist cured. The curing process is most critical in the first 48-hours. Many applicators return to a job two or three days after the basecoat is applied, wet it down two or three times, and erroneously believe they have adequately cured the basecoat. Moist curing after the initial 48-hours will only harden the surface, and not the entire depth of the basecoat. Hot or windy climates draw moisture from inside the plaster and stop the curing process. Poorly cured basecoats will significantly reduce compressive, tensile, and flexural strengths.
Cold weather applications create a different set of curing problems altogether. The code requires a minimum of 48-hours moist curing time. Technically, this means that new stucco installations should not be exposed to temperatures less than 40°F during this time period. Portland cement products that freeze during application will have a permanent ice crystal pattern within the cement matrix. Product applied in this temperature range will never reach its full potential strength and may experience future deterioration.
