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Wood Furring Strips on Ceiling Type I & II Construction

classicT

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Aug 2, 2017
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Washington State
See IBC Section 603.1 #18 which references to Section 803.13

803.13 Application of Interior Finish Materials to Fire-Resistance-Rated or Noncombustible Building Elements
Where interior finish materials are applied on walls, ceilings or structural elements required to have a fire-resistance rating or to be of noncombustible construction, these finish materials shall comply with the provisions of this section.

803.13.1 Direct Attachment and Furred Construction
Where walls and ceilings are required by any provision in this code to be of fire-resistance-rated or noncombustible construction, the interior finish material shall be applied directly against such construction or
to furring strips not exceeding 1 3/4 inches (44 mm), applied directly against such surfaces.

803.13.1.1 Furred Construction

If the interior finish material is applied to furring strips, the intervening spaces between such furring strips shall comply with one of the following:
  1. Be filled with material that is inorganic or noncombustible;
  2. Be filled with material that meets the requirements of a Class A material in accordance with Section 803.1.1 or 803.1.2; or
  3. Be fireblocked at a maximum of 8 feet (2438 mm) in every direction in accordance with Section 718.
 

Tim Mailloux

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Feb 12, 2018
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339
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Hartford CT
See IBC Section 603.1 #18 which references to Section 803.13

803.13 Application of Interior Finish Materials to Fire-Resistance-Rated or Noncombustible Building Elements
Where interior finish materials are applied on walls, ceilings or structural elements required to have a fire-resistance rating or to be of noncombustible construction, these finish materials shall comply with the provisions of this section.

803.13.1 Direct Attachment and Furred Construction
Where walls and ceilings are required by any provision in this code to be of fire-resistance-rated or noncombustible construction, the interior finish material shall be applied directly against such construction or
to furring strips not exceeding 1 3/4 inches (44 mm), applied directly against such surfaces.

803.13.1.1 Furred Construction

If the interior finish material is applied to furring strips, the intervening spaces between such furring strips shall comply with one of the following:
  1. Be filled with material that is inorganic or noncombustible;
  2. Be filled with material that meets the requirements of a Class A material in accordance with Section 803.1.1 or 803.1.2; or
  3. Be fireblocked at a maximum of 8 feet (2438 mm) in every direction in accordance with Section 718.

why not use metal hat channels?
 

e hilton

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Jul 2, 2014
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1,227
Location
Virginia
How are wood and metal strips treated differently? Seems like both need to meet the 3 requirements:
  1. Be filled with material that is inorganic or noncombustible;
  2. Be filled with material that meets the requirements of a Class A material in accordance with Section 803.1.1 or 803.1.2; or
  3. Be fireblocked at a maximum of 8 feet (2438 mm) in every direction in accordance with Section 718.
 

classicT

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Aug 2, 2017
Messages
1,509
Location
Washington State
How are wood and metal strips treated differently? Seems like both need to meet the 3 requirements:
  1. Be filled with material that is inorganic or noncombustible;
  2. Be filled with material that meets the requirements of a Class A material in accordance with Section 803.1.1 or 803.1.2; or
  3. Be fireblocked at a maximum of 8 feet (2438 mm) in every direction in accordance with Section 718.
Same requirements, just different materials.
 

classicT

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Location
Washington State
Ok. In #3 Tim says why not use metal hat channels, with the implication it would make a difference in codevapplication.
Yeah, I thought the same... but per my reading of 803.13.1.1, there is no differentiation, thus the same implications whether wood or hat channel.
 

jar546

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Oct 16, 2009
Messages
7,916
Location
Palm Beach County Florida
Yeah, I thought the same... but per my reading of 803.13.1.1, there is no differentiation, thus the same implications whether wood or hat channel.

Isn't hat channel, hat channel and wood furring strips are 'furring' strips? The section is for furring strips, not metal framing.
(devil's advocate)
 

my250r11

Sawhorse
Joined
Feb 16, 2015
Messages
755
Location
Roswell, NM
803.13.1.1 Furred Construction
If the interior finish material is applied to furring strips, the intervening spaces between such furring strips shall comply with one of the following:
  1. Be filled with material that is inorganic or noncombustible;
  2. Be filled with material that meets the requirements of a Class A material in accordance with Section 803.1.1 or 803.1.2; or
  3. Be fireblocked at a maximum of 8 feet (2438 mm) in every direction in accordance with Section 718.

It says 1 of the following, #1 says in organic or noncombustible, IMHO hat channel is noncombustible so no fireblocking or filling cavities is required. Be the same as a metal stud wall with nothing in it. AHH my bad does say filled with matierial. We all miss things once in a while. :eek:
 
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