09 24 00 Portland Cement Plastering
Utilize this section to specify Portland cement plastering for use for wall, ceiling, and soffit finishes. This product is sometimes referred to as “stucco”.
Portland cement plaster for exterior and interior wall and soffit finishes consists of two or more coats of cement-based plaster applied over metal lath or a solid substrate such as concrete or masonry.
Portland cement plaster provides a durable exterior finish that can be left exposed to the weather. Portland cement plaster is susceptible to cracking and to water absorption when used as an exterior finish. Cracking can be minimized by the proper placement of control joints. Water absorption is minimized by the use of a proprietary finish coat or the application of paint.
Numerous manufacturers offer synthetic plaster finishes, Due to the wide variety of available products these are not included in this section but can be added.
A wide range of finishes are available for Portland cement plaster, the most common of which are included in this section. Other finishes can be added.
Corner beads are required to prevent damage to external corners.
Casing beads are placed where plaster stops or abuts dissimilar materials or stops with the edge exposed.
Control joints must be installed to minimize cracking. In general control joints should be placed:
– To limit each area of plaster to 144 square feet or 12 feet on center maximum.
– Vertically above and below each side or openings.
– Horizontally at each floor line.
Portland cement plaster loses up to 4 percent of its original volume as it dries, Thus, even with proper control joint placement cracking often occurs.
In order to prevent damage caused by cracking and water absorption an elastomeric coating can be applied over the plaster.
Hybrid plaster systems consisting of a Portland cement plaster base with a synthetic plaster finish coat provide the benefits of Portland cement plaster with a more weather-resistant finish.
The SimpleSpecs™ master specs concept
Design professionals are accustomed to seeing lengthy project specifications, so why is SimpleSpecs™ so short?
Specifications have grown evermore wordy over the years for several reasons:
The mistaken belief that specifications must be lengthy and legal-sounding to be enforceable. In fact, quite the opposite is true. Having shorter, easily understood specifications makes us less likely to have problems in the field.
A belief that having lots of words protects us from a Contactor making mistakes. There is no way to include enough statements to protect yourself from a bad contractor, regardless of the length of your specification.
Our desire to be in control of the project by specifying means and methods instead of including simple, enforceable statements.
Easier to Edit
SimpleSpecs™ is written as a series of Microsoft word files that include statements that affect construction costs or overall quality and are far simpler to edit than other master specification systems.
Each SimpleSpecs™ specification section is non-proprietary and includes three manufacturers that meet the specified reference standards, descriptive, or performance-based requirements. They are written to allow any listed manufacturers to provide the specified products.
Hidden Guide Text
Each SimpleSpecs™ specification section includes hidden text to inform and guide users in editing the specifications to suit project conditions.
SimpleSpecs™ sections are edited using pre-defined options that are contained in [brackets] or by selecting optional text separated by "OR" statements. Paragraph and page numbering are included as automatic codes, eliminating the need to renumber when revisions are made manually. Global changes to headers, footer, terms, font colors and phrases are easily updated using a third-party search and replace software, available through ZeroDocs.com.