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Building Components and Materials:
NCIDQ IDPX & PRAC Study Guide
Questions and Correct Answers/ Latest
Update / Already Graded
Wood and metal studs
Ans: Typical stud materials used in construction; wood studs
(2x4 or 2x6) are common in residential constructio n, while
metal studs are standard in commercial projects.
Common metal stud sizes
Ans: 1-5/8", 2-1/2", 3-5/8", 4", and 6" — selected based on wall
type, span, and performance requirements.
Gypsum wallboard
Ans: Also known as drywall, plasterboard, or Sheetrock. It
consists of gypsum sandwiched between paper sheets.
Standard gypsum board sizes
Ans: 4'×8', 4'×10', 4'×12', and 4'6"×9'. Chosen based on ceiling
height and panel handling.
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Standard gypsum thickness for residential and commercial walls
Ans: Residential: 1/2". Commercial: 5/8" for added fire
resistance and durability.
Type X gypsum board
Ans: A fire-rated gypsum board reinforced with fiberglass that
maintains integrity longer during fire exposure.
MMR gypsum board
Ans: Mold- and moisture-resistant board used in humid areas
(not for direct water contact).
Portland cement board
Ans: A strong, water-resistant substrate used behind tile or as
an underlayment in wet areas (e.g., showers).
Purpose of fire-rated gypsum walls
Ans: To prevent fire spread and maintain compartmentation
between spaces.
Key requirements for fire-rated partitions
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Ans: They must extend slab-to-slab and all
connections/openings must be sealed with fire-rated caulking
material.
Studs
Ans: Vertical framing members in wall construction; wood for
residential, metal for commercial.
Gypsum Wallboard (GWB)
Ans: A panel made of a gypsum core between paper facings;
common for interior walls.
MMR Board
Ans: Mold- and moisture-resistant gypsum board used in
humid spaces.
Fire-Rated Partition
Ans: Wall assembly designed to resist fire for a specific
duration; extends slab to slab.
Acoustic Separation Partition
All rights reserved © 2025/ 2026 |
Building Components and Materials:
NCIDQ IDPX & PRAC Study Guide
Questions and Correct Answers/ Latest
Update / Already Graded
Wood and metal studs
Ans: Typical stud materials used in construction; wood studs
(2x4 or 2x6) are common in residential constructio n, while
metal studs are standard in commercial projects.
Common metal stud sizes
Ans: 1-5/8", 2-1/2", 3-5/8", 4", and 6" — selected based on wall
type, span, and performance requirements.
Gypsum wallboard
Ans: Also known as drywall, plasterboard, or Sheetrock. It
consists of gypsum sandwiched between paper sheets.
Standard gypsum board sizes
Ans: 4'×8', 4'×10', 4'×12', and 4'6"×9'. Chosen based on ceiling
height and panel handling.
All rights reserved © 2025/ 2026 |
, Page |2
Standard gypsum thickness for residential and commercial walls
Ans: Residential: 1/2". Commercial: 5/8" for added fire
resistance and durability.
Type X gypsum board
Ans: A fire-rated gypsum board reinforced with fiberglass that
maintains integrity longer during fire exposure.
MMR gypsum board
Ans: Mold- and moisture-resistant board used in humid areas
(not for direct water contact).
Portland cement board
Ans: A strong, water-resistant substrate used behind tile or as
an underlayment in wet areas (e.g., showers).
Purpose of fire-rated gypsum walls
Ans: To prevent fire spread and maintain compartmentation
between spaces.
Key requirements for fire-rated partitions
All rights reserved © 2025/ 2026 |
, Page |3
Ans: They must extend slab-to-slab and all
connections/openings must be sealed with fire-rated caulking
material.
Studs
Ans: Vertical framing members in wall construction; wood for
residential, metal for commercial.
Gypsum Wallboard (GWB)
Ans: A panel made of a gypsum core between paper facings;
common for interior walls.
MMR Board
Ans: Mold- and moisture-resistant gypsum board used in
humid spaces.
Fire-Rated Partition
Ans: Wall assembly designed to resist fire for a specific
duration; extends slab to slab.
Acoustic Separation Partition
All rights reserved © 2025/ 2026 |
