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Attached garage separation question

B

bill1952

SAWHORSE
Joined
Aug 12, 2021
Messages
2,648
Location
Clayton NY
I understand the basic requirements for 1/2 or 5/8 gwb but 2 questions:

If the dwelling and garage are fire sprinklered, is the gwb still required? I think so but not sure.

Any penetrations of the gwb, 2024 IRC refers to R302.11 Fireblocking. and no. 4. At openings around vents, pipes, ducts, cables and wires at ceiling and floor level, with an approved material to resist the free passage of flame and products of combustion. The material filling this annular space shall not be required to meet the ASTM E136 requirements. Examples of approved materials? 10 or more years ago I used Great Stuff Fireblock around a pipe and the inspector rejected it. I had to remove it and instead use sheet rock mud. Was inspector's objection to the Great Stuff Fireblock product usual?
 
bill1952 said:
Was inspector's objection to the Great Stuff Fireblock product usual?
Click to expand...

Yes and No
It is not a substitute for required fire blocking material

ESR-1961 - ICC Evaluation Service, LLC (ICC-ES)

icc-es.org icc-es.org

1731961621392.png


1 Source: www.energystar.gov2 70 ±5 °F and 50 ±5 % RH, 1 inch bead diameter, 6 inch length. Cure rate is dependent on temperature,humidity, and size of foam bead.3 Calculated based on ASTM C1536 Yield Test Results* Read all instructions and (Material) Safety Data Sheet ((M)SDS) carefully before use.**Intended for use in residential application to maintain the continuity of an approved fire block material.
 
So is the 3M fire sealant - red caulk - an acceptable product for this?

Related question, can I put a piece of conduit through the drywall - with the right fire barrier sealant - to allow pulling we wires in the future?
 
bill1952 said:
So is the 3M fire sealant - red caulk - an acceptable product for this?

Related question, can I put a piece of conduit through the drywall - with the right fire barrier sealant - to allow pulling we wires in the future?
Click to expand...
Short answer...yes....It's not actually a rating so I would allow a rated penetration detail to be used...I would also allow you to tape/ mud the conduit in and "cap" it with equivalent materials....
 
Most SFD do not require a rated assembly, thus I wish they would clarify this better in the IRC.

So if it's not a required rated assembly and you call it fireblocking, is fireblocking required in none rated assemblies, or should it be called draftstopping?

These are the kind of questions we get on a regular basis.
 
my250r11 said:
is fireblocking required in none rated assemblies
Click to expand...
Yes

[RB] FIREBLOCKING. Building materials or materials approved for use as fireblocking, installed to resist the free passage of flame to other areas of the building through concealed spaces.

R302.11 Fireblocking.
In combustible construction, fireblocking shall be provided to cut off both vertical and horizontal concealed draft openings and to form an effective fire barrier between stories, and between a top story and the roof space.

Fireblocking shall be provided in wood-framed construction in the following locations:

1. In concealed spaces of stud walls and partitions, including furred spaces and parallel rows of studs or staggered studs, as follows:

1.1. Vertically at the ceiling and floor levels.

1.2. Horizontally at intervals not exceeding 10 feet (3048 mm).

2. At interconnections between concealed vertical and horizontal spaces such as occur at soffits, drop ceilings and cove ceilings.

3. In concealed spaces between stair stringers at the top and bottom of the run. Enclosed spaces under stairs shall comply with Section R302.7.

4. At openings around vents, pipes, ducts, cables and wires at ceiling and floor level, with an approved material to resist the free passage of flame and products of combustion. The material filling this annular space shall not be required to meet the ASTM E136 requirements.

5. For the fireblocking of chimneys and fireplaces, see Section R1003.19.

6. Fireblocking of cornices of a two-family dwelling is required at the line of dwelling unit separation.
 
my250r11 said:
Most SFD do not require a rated assembly, thus I wish they would clarify this better in the IRC.

So if it's not a required rated assembly and you call it fireblocking, is fireblocking required in none rated assemblies, or should it be called draftstopping?

These are the kind of questions we get on a regular basis.
Click to expand...
Are you a code official? The difference between firestopping and draftstopping is clear in both the IBC and IRC. There is nothing in the requirements about FRR construction for either. Concealed spaces is the trigger, not FRR. Draftstopping is to subdivide floor/ceiling and attic assemblies (horizontal movement of air) and fireblocking compartmentalizes vertical assemblies, stairs, and between floor/wall connections.

Are you thinking firestopping? Firestopping is required in FRR assembly penetrations.

IRC 302 lists all the required locations, it even explicitly tells you how to protect a conduit through the garage wall.
 
mtlogcabin said:
Yes and No
It is not a substitute for required fire blocking material

ESR-1961 - ICC Evaluation Service, LLC (ICC-ES)

icc-es.org icc-es.org

View attachment 14696


1 Source: www.energystar.gov2 70 ±5 °F and 50 ±5 % RH, 1 inch bead diameter, 6 inch length. Cure rate is dependent on temperature,humidity, and size of foam bead.3 Calculated based on ASTM C1536 Yield Test Results* Read all instructions and (Material) Safety Data Sheet ((M)SDS) carefully before use.**Intended for use in residential application to maintain the continuity of an approved fire block material.
Click to expand...
I would approve this for SFR if I were the AHJ. The ICC report lists it for use as sealing penetrations in fireblocking of non-FRR assemblies.
 
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