In our March 2008 column, we discussed the ever-growing online library of technical documents published by the Gypsum Association. To restate one of the major points made in that column, one of our most important roles in the industry is that of providing the most current technical information on gypsum products to three target audiences: contractors, design professionals, and building officials.
In
our March 2008 column, we discussed the ever-growing online library of
technical documents published by the Gypsum Association. All of these documents
are available via free download from our Web site atwww.gypsum.org/download.html.
To restate one of the major points made in that
column, one of our most important roles in the industry is that of providing
the most current technical information on gypsum products to three target
audiences: contractors, design professionals, and building officials. To ensure
that these audiences are using the most current version of our technical
documents, we have included in the latest round of documents language
recommending that users check our Web site for a listing of the most recent
versions of our technical documents, and we have added a page on our Web site
specifically for that purpose atwww.gypsum.org/currenteditions.html.
Yet we know that people get busy, especially when trying to drum up business
during a tightening economy, and we know that going to our Web site for random
updates is probably not among the top ten most important things a drywall
contractor sets out to do on any given day. We also know that Walls &
Ceilings has a loyal readership comprised of the best informed contractors in the
business, so we’re going to use this opportunity to recap the publications
we’ve updated during 2008 and touch on the topics these documents cover.
Each of the documents discussed below has been recently reviewed by the Gypsum
Association’s Technical Committee and updated to comply with the most current
industry standards. The Technical Committee is comprised of technical experts
from each of the association’s member companies, several of whom are recipients
of PhD degrees in their respective fields. These experts participate in ANSI,
ASTM, and other standards writing bodies as well as the model building code
process. Before a Gypsum Association technical document is published or
updated, it must meet the strict scrutiny of these industry experts who are
tasked with ensuring that the document reflects the most current and accurate
information available on the topics it addresses. Each document is reformatted
to appear in a uniform layout so that users can easily find the information
they seek.
THIS YEAR’S OFFERINGS
GA-222-08, “Repairing Screw or Nail Pops,” explains that fastener pops are
caused by one of several conditions including shrinking lumber, loose
attachment of a gypsum panel product, twisted or improperly installed framing,
improper fastener length, and improper fastener installation. The document then
provides step-by-step instructions for correcting surface irregularities
resulting from fastener pops. GA-222-08 also includes graphics that illustrate
how wood framing with high moisture content and overly long fasteners can
produce fastener pops. The revised version of GA-222 offers new illustrations
and metric equivalents.
GA-224-08, “Installation of Predecorated Gypsum Board,” provides essential
information regarding pre-decorated gypsum board, including the applicable ASTM
and other standards, definitions of terms used throughout the document,
delivery, identification, handling, and storage measures, favorable
environmental conditions, materials used in building systems that incorporate
pre-decorated gypsum board, and proper application methods and procedures. The
document also provides additional application, maintenance, and repair
information in its appendices. The revised version includes new reference
standards and updated metric conversions.
GA-225-08, “Repair of Fire-Rated Gypsum Board Systems,” provides step-by-step
instructions and photographic examples of how to properly repair damaged areas
smaller than 100 square inches in fire-rated gypsum board assemblies. This
document also provides recommendations for repairing damaged areas larger than
100 square inches in gypsum board assemblies, staggering joints in
multi-layered systems, and improving the aesthetic appearance of unsightly but structurally
sound gypsum board assemblies. The revised version of GA-225 offers new
illustrations and updated text.
GA-226-08, “Application of Gypsum Board to Form Curved Surfaces,” describes
proper materials and procedures necessary for both dry and wet bending of
gypsum board to form either convex or concave curved surfaces. The document
also discusses the application of gypsum board in archways and techniques for
finishing gypsum board once it has been used to create a curved surface. The
revised version of GA-226 offers new illustrations and instructions on
preventing unwanted mold growth.
GA-229-08, “Shear Values for Screw Application of Gypsum Board on Walls,”
presents shear values achieved using a variety of gypsum board thickness, screw
types, and screw patterns. The shear values are displayed in a table that shows
board thickness, board orientation, screw type, edge screw spacing, field screw
spacing, average ultimate shear, and the applicable test report title. Shear
values were determined through a series of tests conducted according to the
method set forth in ASTM E 72, “Standard Test Methods of Conducting Strength
Tests of Panels for Building Construction.” The document also provides the
following conclusions reached after extensive testing of the different
attachment configurations: Shear values are comparable for both Type S and W
screws; shear values for parallel application exceed those for perpendicular
application; shear values for 5/8-inch (15.9 mm) gypsum board exceed those for
1/2-inch (12.7 mm) gypsum board; shear values increase with closer spacing of
perimeter fasteners; and when compared to other shear test results, shear
values for screws are higher than for nails. The revised version of GA-229 has
been reformatted for easier reading.
GA-234-08, “Control Joints for Fire-Resistance Rated Systems,” provides the
Gypsum Association’s recommendations for the installation of control joints in
the following building systems: the base building structure, uninterrupted walls
or partitions, interior ceilings with perimeter relief, interior ceilings
without perimeter relief, exterior ceilings and soffits, where ceiling framing
changes direction, and surfaces where architectural features occur. GA-234 also
provides generic details for control joints in the following conditions: 1-Hour
Wall and Partitions Systems, 2-Hour Wall and Partition Systems, and a 1-Hour
Floor-Ceiling System with Suspended Ceiling. The revised version of GA-234
offers clarification regarding the distances between joints and metric
equivalents.
GA-605-08-08, “Proprietary Gypsum Panel Products for Use in UL Classified
Systems,” contains tables listing the proprietary products of participating
association members that are mentioned by type in the Underwriters Laboratory
Fire Resistance Directory. This document is updated quarterly by the
Association and is made available so that contractors, design professionals,
and building officials can determine which of the currently available gypsum
panel products meets the product requirements set forth in the approved fire
resistance-rated designs published in the UL directory. This document was
introduced this year in response to requests from design professionals for a
quick cross-reference guide for identifying the products called out in the UL
directory.
CANADIAN FRENCH VERSIONS
We have also been made aware that several of our technical documents have
become required reading in the French-speaking areas of Canada. (Anyone who has
driven through Canada
lately has observed that highway signs are presented in both English and
French, as are product labels.) In response to requests by our Canadian
members, we have translated into Canadian French and posted in PDF format on
our Web site the following technical documents:
GA-214-07, Niveaux Recommandés De Finition Des Plaques De Plâtre (Recommended
Levels of Gypsum Board Finish). This document was first created in the early
1990s to spell out how many coats of joint compound and joint tape are
necessary to achieve the desired final gypsum board finish before decorating.
Prior to the publication of this document, contractors were expected to provide
a “workmanlike finish” with no real guidance beyond that as to how to meet that
expectation. Today, this document enables contractors to provide exactly what
specifiers call for.
GA-216-07, Pose Et Finition De Plaques De Plâtre (Application and Finishing of
Gypsum Panel Products). This document provides the most recent industry recommendations
for the application and finishing gypsum panel products, from framing alignment
and fastener spacing to multilayer and renovation
applications.
GA-801-07, Manipulation Et Entreposage De Plaques De Platre: Un Guide Pour Les
Distributeurs, Les Détaillants Et Les Entrepreneurs (Handling And Storage Of
Gypsum Panel Products: A Guide For Distributors, Retailers, and Contractors).
This document provides guidelines for safely shipping, storing, and handling
gypsum panel products in both the supply yard and the job
site.
These Canadian French versions can be found on both our download page:www.gypsum.org/download.html, and a page specifically dedicated to Canadian
French documents atwww.gypsum.org/canadianfrench.html.
As anyone can see, the Gypsum Association has stayed busy getting our online
library current during 2008. With 2009 right around the corner, we have several
more documents in the works, so stay tuned. W&C
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