User Guide

Plumbing Design Assistance Manual l Chapter 3 – Fire-resistant construction l 17
Chapter 3:
Fire-resistant construction
Wood-frame
wall assemblies
Wood-frame wall assemblies
complying with ASTM E119
and CAN/ULC-S101 have the
following requirements.
Building elements
• Studs: Nominal wood 2x4
spaced 16" on center (o.c.)
• Gypsum wallboard: Minimum
one layer of ⅝" Type X
gypsum wallboard
Pipe and ttings
• Pipe: Maximum density of
Uponor PEX pipe is 4.85 lbs.
per linear feet (7.23 kg/m)
of cavity. Approved Uponor
PEX pipes include:
- Uponor AquaPEX White
(up to 3")
- Uponor AquaPEX Red
(up to 1")
- Uponor AquaPEX Blue
(up to 1")
- Uponor AquaPEX
Reclaimed Water (up to 2")
- Pre-insulated Uponor
AquaPEX (up to 2" pipe
with 1½" thick insulation)
- Wirsbo hePEX™ (up to 4")
• Fittings: Maximum density of
Uponor ProPEX brass or EP
ttings is 3.33 lbs. (1.51 kg)
per stud cavity.
Note: See assembly details
for more information.
Assembly numbers
ITS Design No. UW/WA 60-02
• 1-hour
• Up to 2" PEX
QAI Design No. P321-1B
• 1-hour
• Up to 4" PEX
QAI Design No. P321-1H
• 2-hour
• Up to 4" PEX
UL Design No. U372
• 1-hour
• Up to 2" PEX
Note: Maximum size is
available through QAI.
Wood-frame oor/
ceiling assemblies
Wood-frame oor/ceiling
assemblies complying
with ASTM E119 and
CAN/ULC-S101 have
the following requirements.
Building elements
• Joists: Nominal 2x10 solid
sawn wood, open-web wood
or wood I-joist (10" to 24"
depth) installed at 24" o.c.
maximum
• Suboor: Minimum ⅝"
plywood; if using optional
topping, suboor may be ⅝"
oriented strand board (OSB)
• Gypsum wallboard:
- Minimum one layer of ⅝"
Type X gypsum wallboard
when using solid sawn
wood joists
- Minimum two layers of ½"
Type X gypsum wallboard
when using wood I-joists
(10" to 24" depth)
Pipe and ttings
• Pipe: One or more Uponor
PEX piping runs ½" to
2"; weight of PEX piping
not to exceed 0.63 lbs./ft.
(0.94 kg/m) of joist cavity.
Support pipe with metal clips
16" o.c. for piping up to 1"
diameter or metal clips 24"
o.c. for piping larger than 1"
diameter.
• Fittings: Brass or EP ttings
with a weight not exceeding
0.1 lbs./ft. (0.15 kg/m) per
joist cavity
Note: See assembly details
for more information.
Assembly numbers
ITS Design No. UW/FC 60-01
• 1-hour
• Up to 2" PEX
ITS Design No. UW/WA 60-02
• 1-hour
• Up to 2" PEX
QAI Design No. P321-1F
• 1-hour
• Up to 2" PEX
UL Design No. L557
• 1-hour
• Up to 2" PEX
ASTM E119 (ANSI/UL 263) or CAN/ULC-S101 listings
Fire-resistive assembly ratings (ASTM E119/ANSI/UL 263 and CAN/ULC-S101)
Construction type Assembly type UL design no. Intertek QAI
Non-combustible
concrete/steel
Floor/ceiling
K913 UW/FCA 120-01/-02 P321-1D (2-hr)
G524 — P321-1E (2-hr)
G573 — P321-1C (2-hr)
Walls
V444 UW/WA 60-01 P321-1A (1-hr)
— — P321-1G (2-hr)
Wood frame
construction
Floor/ceiling L557 UW/FCA 60-01 P321-1F (1-hr)
Walls
U372 UW/FCA 60-02 P321-1B (1-hr)
— — P321-1H (2-hr)
Table 3-1: ASTM E119 (ANSI/UL 263) and CAN/ULC-S101 listings