04
Job: 03-30364 Title: Rp-Architecture Reference & Specification
#175 DTP: 216 Page: 44
(RAY) (Text)
(P 285U)
Chapter 4: Finishes
Interior nishes encompass all
materials and surfaces that can be
seen or touched. The choice
of materials and the methods of
construction should be based on
the function of the space, the
anticipated volume of trafc,
acoustical effects, re-resistance
ratings, and aesthetic appearance.
CEILINGS
WALL SYSTEMS
FINISH CARPENTRY
44 THE ARCHICTECTURE REFERENCE + SPECIFICATION BOOK
001-272_30364.indd 44 4/19/13 12:23 PM
04
Job: 03-30364 Title: Rp-Architecture Reference & Specification
#175 DTP: 216 Page: 44
Job: 03-30364 Title: Rp-Architecture Reference & Specification
#175 DTP: 216 Page: 45
(RAY) (Text)
(P 285U)
FINISH FLOORING
FINISH CARPENTRY
Finishes 45
001-272_30364.indd 45 4/19/13 12:23 PM
04
Job: 03-30364 Title: Rp-Architecture Reference & Specification
#175 DTP: 216 Page: 46
(RAY) (Text)
(P 285U)
WALL SYSTEMS
Gypsum Board
Gypsum board goes by many names: gypsum wallboard (GWB), drywall, plasterboard, and
Sheetrock (a trademarked brand name). Gypsum board is a less expensive alternative to
plaster, because it requires less labor, time, and skill to install, but it still provides excellent
re-resistance and sound control.
Gypsum, a naturally occurring mineral, is formulated chemically when combined with water,
starch, and other elements into a slurry and placed between paper faces to become gypsum
board. When gypsum board is exposed to re, the water is released as steam, providing a re
barrier until the water is completely eliminated (calcination). When the gypsum is completely
calcined, its residue still acts as an insulating barrier to ames, preventing the structural
members behind it from igniting.
Customary Sizes
Panel sizes may
vary depending on
the type of board,
though generally
they fall in the
following range:
4’ (1 220) wide by
8’ (2 439) to
16’ (4 877) high.
Widths of 2’ (610)
and 2’-6” (762)
and heights of
6’ (1 829) may also
be available for
certain prenished
boards and core
boards.
SI Preferred Sizes
Standard panel size
is 1 200 x 2 400 mm.
Other acceptable
increments are
600 mm, 800 mm,
and 900 mm.
Panel Types
Backing board: Used as a base layer when
multiple layers are needed, improving re
resistance and sound control.
Coreboard: Thicker boards, 1” (25.4) and
2” (50.8), used to enclose vent shafts,
emergency egress stairs, elevator shafts,
and other vertical chases.
Foil-backed: Can work as a vapor barrier
in exterior wall assemblies and as a thermal
insulator.
Prefinished: Covered in a variety of nishes
such as paint, paper, or plastic lm for
installation without further nishing.
Regular: Used for most applications.
Type X: Short glass bers in the core hold
the calcined gypsum residue in place for
increased re resistance protection ratings.
Water-resistant (green board): Water-
resistant board with a water-repellent paper
facing (colored light green to distinguish it
from other walls) and a moisture-resistant
core (also available in type X); used as base
for tiles and other nonabsorbent materials in
wet locations.
46 THE ARCHICTECTURE REFERENCE + SPECIFICATION BOOK
001-272_30364.indd 46 4/19/13 12:23 PM
04
Job: 03-30364 Title: Rp-Architecture Reference & Specification
#175 DTP: 216 Page: 46
Job: 03-30364 Title: Rp-Architecture Reference & Specification
#175 DTP: 216 Page: 47
(RAY) (Text)
(P 285U)
1
/4 (6.4)
backing board, some acoustic work
5
/16 (8)
used for manufactured housing
3
/8 (9.5)
used in double-layer nishes
1
/2 (12.7)
used for stud spacings up to 24”
(610), most common thickness
5
/8 (16)
used when additional re resistance
or structural stiffness are required
1” (25.4)
coreboard used for shaft walls
Edge TypesBoard Thicknesses
Rounded
Beveled
Tongue and Groove
Tapered
Rounded Taper
Square
Finishes 47
001-272_30364.indd 47 4/19/13 12:23 PM

Get The Architecture Reference & Specification Book now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.