9 . INSPECTION GUIDELINES FOR MEMBRANE PENETRATIONS FIRESTOP SYSTEMS
A membrane penetration occurs when a building system component penetrates only one side of a fire rated floor / wall assembly . Examples of membrane penetrations include electrical outlet boxes , junction boxes , and piping / conduit penetrating only one side of the floor / wall assembly .
For cases where a penetrating items , such as a plumbing pipe , electrical conduit , cables , etc ., only penetrates one side of a fire rated floor / wall assembly , this membrane penetration can be properly addressed by following the requirements of a through penetration firestop system that matches the application .
For the firestopping of membrane penetrations , some of the most commonly used firestopping materials include :
• Firestop putty pads ( Hilti CP 617 ) and Endothermic Wrap ( Hilti CFP-ES Endo-Shield ) for protecting outlet boxes and junction boxes .
• Flexible , silicone based firestop sealants ( Hilti CP606 )
• Intumescent firestop seleants ( Hilti FS-ONE MAX )
9.1 Steps for inspection
CHECK POINTS FOR MEMBRANE PENETRATIONS
1 ) Is the hourly fire rating of the referenced firestop system or EJ greater than or equal to the fire rating of the wall assembly being penetrated ?
2 ) Does the wall construction match the wall assembly listed in the firestop system or EJ ?
3 ) Does the penetrating Item ( s ) match the acceptable list of penetrants ( material , size , etc .) shown in the firestop system or EJ ?
4 ) Does the field installation comply with the following requirements of the referenced firestop system or EJ ?
a ) Size of opening b ) Minimum and maximum annular space requirements c ) Proper backing material ( when required )
d ) Proper firestopping product , including type , amount , thickness , orientation , etc .
e ) Proper accessories installed , including anchor / fasteners , mounting or cover plates , frames , etc .
f ) For multiple penetrants : proper distance between penetrating items
g ) For putty pads : is it installed completely covering the box
h ) For putty pads : is there an overlap of material between the box and the inside wall surface i )
For putty pads : is the pad stretched disproportionately or sagging in any areas
OBSERVATION COMMENTS Yes No N / A
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Yes No N / A Yes No N / A Yes No N / A
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Yes No N / A
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