Building Components and Materials: NCIDQ IDPX &
PRAC Study Guide Exam Questions and Answers Grade A+
Wood and metal studs - Answer-Typical stud materials used in construction; wood
studs (2x4 or 2x6) are common in residential construction, while metal studs are
standard in commercial projects.
Common metal stud sizes - Answer-1-5/8", 2-1/2", 3-5/8", 4", and 6" — selected
based on wall type, span, and performance requirements.
Gypsum wallboard - Answer-Also known as drywall, plasterboard, or Sheetrock. It
consists of gypsum sandwiched between paper sheets.
Standard gypsum board sizes - Answer-4'×8', 4'×10', 4'×12', and 4'6"×9'. Chosen
based on ceiling height and panel handling.
Standard gypsum thickness for residential and commercial walls - Answer-
Residential: 1/2". Commercial: 5/8" for added fire resistance and durability.
Type X gypsum board - Answer-A fire-rated gypsum board reinforced with
fiberglass that maintains integrity longer during fire exposure.
MMR gypsum board - Answer-Mold- and moisture-resistant board used in humid
areas (not for direct water contact).
,Portland cement board - Answer-A strong, water-resistant substrate used behind tile
or as an underlayment in wet areas (e.g., showers).
Purpose of fire-rated gypsum walls - Answer-To prevent fire spread and maintain
compartmentation between spaces.
Key requirements for fire-rated partitions - Answer-They must extend slab-to-slab
and all connections/openings must be sealed with fire-rated caulking material.
Studs - Answer-Vertical framing members in wall construction; wood for
residential, metal for commercial.
Gypsum Wallboard (GWB) - Answer-A panel made of a gypsum core between
paper facings; common for interior walls.
MMR Board - Answer-Mold- and moisture-resistant gypsum board used in humid
spaces.
Fire-Rated Partition - Answer-Wall assembly designed to resist fire for a specific
duration; extends slab to slab.
Acoustic Separation Partition - Answer-Wall constructed to reduce sound
transmission between rooms; joints sealed with acoustical caulk.
Five main levels of gypsum finish - Answer-Levels 0-5. Each level increases
smoothness and finish quality depending on final wall treatment.
,Level 0 finish - Answer-No taping, finishing, or accessories. Used in temporary
construction or areas not visible to occupants.
Level 1 finish - Answer-Tape embedded in joint compound with excess wiped off.
Used in concealed areas (e.g., plenums above ceilings).
Level 2 finish - Answer-One coat of joint compound over embedded tape. Used in
garages or where heavy texture is applied.
Level 3 finish - Answer-Two coats of joint compound; surface free of tool
marks/ridges. Used where medium/heavy texture or non-gloss paint is applied.
Level 4 finish - Answer-Three coats of joint compound. Used for light texture or
wall coverings where economy matters.
Level 5 finish - Answer-Level 4 plus a thin skim coat over the entire surface. Used
for gloss/semi-gloss paints or areas with harsh lighting.
Furring Runner - Answer-Horizontal support channel used to attach panels or
finish layers to wall framing.
Wall Runner - Answer-Component used in acoustical panel wall systems.
Stud Sections - Answer-Vertical framing members in a wall system.
Clips - Answer-Fasteners used to secure panels in an acoustical wall system.
, Progressive Wall Panel - Answer-System where each panel depends on adjacent
panels for structural support.
Non-Progressive Wall Panel - Answer-Panels are individually installed and
removable; allows flexibility for access.
Acoustical Partition - Answer-Wall designed to limit sound transmission; sealed
joints and continuous structure required.
Level 0-5 Finishes - Answer-Standardized gypsum finish levels ranging from bare
board (0) to full skim coat (5).
Fire-Rated Assembly - Answer-Complete wall construction tested to maintain
integrity during fire exposure. Ref: 2018 IBC §707-708.
Plaster - Answer-Wall finish made from gypsum/lime, water, and aggregates;
applied in multiple coats.
Lath - Answer-Base layer (metal or gypsum) that supports plaster.
Scratch Coat - Answer-First coat of plaster; scored to improve bond with the next
layer.
Brown Coat - Answer-Second coat of plaster; levels the surface before final
finishing.
Finish Coat - Answer-Final thin layer; provides smoothness and surface quality.
PRAC Study Guide Exam Questions and Answers Grade A+
Wood and metal studs - Answer-Typical stud materials used in construction; wood
studs (2x4 or 2x6) are common in residential construction, while metal studs are
standard in commercial projects.
Common metal stud sizes - Answer-1-5/8", 2-1/2", 3-5/8", 4", and 6" — selected
based on wall type, span, and performance requirements.
Gypsum wallboard - Answer-Also known as drywall, plasterboard, or Sheetrock. It
consists of gypsum sandwiched between paper sheets.
Standard gypsum board sizes - Answer-4'×8', 4'×10', 4'×12', and 4'6"×9'. Chosen
based on ceiling height and panel handling.
Standard gypsum thickness for residential and commercial walls - Answer-
Residential: 1/2". Commercial: 5/8" for added fire resistance and durability.
Type X gypsum board - Answer-A fire-rated gypsum board reinforced with
fiberglass that maintains integrity longer during fire exposure.
MMR gypsum board - Answer-Mold- and moisture-resistant board used in humid
areas (not for direct water contact).
,Portland cement board - Answer-A strong, water-resistant substrate used behind tile
or as an underlayment in wet areas (e.g., showers).
Purpose of fire-rated gypsum walls - Answer-To prevent fire spread and maintain
compartmentation between spaces.
Key requirements for fire-rated partitions - Answer-They must extend slab-to-slab
and all connections/openings must be sealed with fire-rated caulking material.
Studs - Answer-Vertical framing members in wall construction; wood for
residential, metal for commercial.
Gypsum Wallboard (GWB) - Answer-A panel made of a gypsum core between
paper facings; common for interior walls.
MMR Board - Answer-Mold- and moisture-resistant gypsum board used in humid
spaces.
Fire-Rated Partition - Answer-Wall assembly designed to resist fire for a specific
duration; extends slab to slab.
Acoustic Separation Partition - Answer-Wall constructed to reduce sound
transmission between rooms; joints sealed with acoustical caulk.
Five main levels of gypsum finish - Answer-Levels 0-5. Each level increases
smoothness and finish quality depending on final wall treatment.
,Level 0 finish - Answer-No taping, finishing, or accessories. Used in temporary
construction or areas not visible to occupants.
Level 1 finish - Answer-Tape embedded in joint compound with excess wiped off.
Used in concealed areas (e.g., plenums above ceilings).
Level 2 finish - Answer-One coat of joint compound over embedded tape. Used in
garages or where heavy texture is applied.
Level 3 finish - Answer-Two coats of joint compound; surface free of tool
marks/ridges. Used where medium/heavy texture or non-gloss paint is applied.
Level 4 finish - Answer-Three coats of joint compound. Used for light texture or
wall coverings where economy matters.
Level 5 finish - Answer-Level 4 plus a thin skim coat over the entire surface. Used
for gloss/semi-gloss paints or areas with harsh lighting.
Furring Runner - Answer-Horizontal support channel used to attach panels or
finish layers to wall framing.
Wall Runner - Answer-Component used in acoustical panel wall systems.
Stud Sections - Answer-Vertical framing members in a wall system.
Clips - Answer-Fasteners used to secure panels in an acoustical wall system.
, Progressive Wall Panel - Answer-System where each panel depends on adjacent
panels for structural support.
Non-Progressive Wall Panel - Answer-Panels are individually installed and
removable; allows flexibility for access.
Acoustical Partition - Answer-Wall designed to limit sound transmission; sealed
joints and continuous structure required.
Level 0-5 Finishes - Answer-Standardized gypsum finish levels ranging from bare
board (0) to full skim coat (5).
Fire-Rated Assembly - Answer-Complete wall construction tested to maintain
integrity during fire exposure. Ref: 2018 IBC §707-708.
Plaster - Answer-Wall finish made from gypsum/lime, water, and aggregates;
applied in multiple coats.
Lath - Answer-Base layer (metal or gypsum) that supports plaster.
Scratch Coat - Answer-First coat of plaster; scored to improve bond with the next
layer.
Brown Coat - Answer-Second coat of plaster; levels the surface before final
finishing.
Finish Coat - Answer-Final thin layer; provides smoothness and surface quality.
