09 29 00 Gypsum Board
Utilize this section to specify interior gypsum board (often called drywall) panels for walls and ceilings. Acoustical batt insulation is also included.
Exterior gypsum sheathing is specified in SimpleSpecs™ Master Guide Specification Section 06 16 43 – Gypsum Sheathing.
Gypsum board panels are used extensively in construction, primarily as an interior wall and ceiling finish.
Gypsum board can be mechanically attached with nails or screws or with adhesive. Adhesive application is typically limited to the attachment of panels to a solid base such as concrete and in multiple layer assemblies.
After attachment to framing members the panels are prepared to receive the final finish by taping and bedding the joints and fastener holes. Most panels have a tapered edge to assist in this, providing space for the tape and bedding compound to be finished flush with the panel faces.
Traditional gypsum board panels have a paper face. Panels having a glass fiber face have been developed that can withstand exposure to moisture as in toilet rooms and for use where the interior finish-out is started before the building is weathertight.
Gypsum board provides excellent fire resistance and is used in many fire-rated assemblies. Panels with a special core, including Types X and C, are often required in fire rated assemblies.
Shaft wall assemblies allow for gypsum board partitions for elevator, stair, and air shafts to be constructed without the need to erect scaffolding in the shaft.
Corner beads are required to prevent damage to external corners.
Casing beads are placed where gypsum board abuts dissimilar materials or stops with the edge exposed.
Control joints must be installed to minimize cracking. In general control joints should be placed:
– 50 feet on center maximum at ceilings and where ceiling framing changes direction.
– 30 feet on center maximum at walls and partitions and at changes in backup construction.
– Above jambs in openings in walls and partitions.
Following are the levels of finish that are identified in GA-216:
– Level 0 Finish: No tape, joint compound, corner bead, or any other accessories. Used as a temporary barrier or in areas where the finishes have not been determined.
– Level 1 Finish: Tape embedded in a single layer of joint compound at all joints and interior corners. The surfaces free from excess joint compound, but tool marks and ridges are acceptable. Generally used above ceilings and in back-of-house areas.
– Level 2 Finish: Tape embedded in a layer of joint compound and then tooled with an additional thin layer of joint compound. Fasteners and accessories covered with one layer of joint compound. Surfaces free from excess joint compound, but tool marks and ridges are acceptable. Generally used above ceilings and in back-of-house areas, garages, and mechanical rooms.
– Level 3 Finish: Tape embedded and tooled with an additional thin layer of joint compound. An additional coat of joint compound is then applied. Fasteners and accessories covered with two coats of joint compound. All surfaces, including joint compound, smooth and free of tool marks. Used where a heavy wall covering or other heavy textured material will be applied.
– Level 4 Finish: Tape embedded and tooled with an additional thin layer of joint compound. Two additional coats of joint compound applied to joints. Interior corners receive one additional coat of joint compound. Fasteners and accessories covered with three layers of joint compound. All surfaces, including joint compound, smooth and free of tool marks. Used where flat paints and lightweight wall coverings will be applied. This is the most common type of finish.
– Level 5 Finish: Tape embedded and tooled with an additional thin layer of joint compound. Two additional coats of joint compound applied to joints. Interior corners receive one additional coat of joint compound. Fasteners and accessories covered with three layers of joint compound. A thin skim coat of joint compound is applied to the entire surface. All surfaces smooth and free of tool marks. This is the highest level of finish, used where semi-gloss, gloss, or other non-textured paints are used and where lighting conditions such as wall-wash light fixtures or light from a nearby window will highlight the surface.
To learn more about drywall, visit Wikipedia.
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.