Membrane penetrations through 1/2 hour assemblies

[tom]

2003 IBC: Help needed for membrane penetrations of 1/2 hour rated assemblies using the exception to 708.3 & 711.3. 713.3.2 & 712.4.2 have req's for min 1 hour assemblies. What do we do with 1/2 hour assemblies? These 2 sections specifically state what to do with a recessed fixture in a 1 hour assembly (not less than) but what about other membrane penetrations in 1/2 hour assemblies? Reading these sections causes confusion concerning how to protect these penetrations since they are less than 1 hour. Thanks all.

 

[TJacobs]

Re: Membrane penetrations through 1/2 hour assemblies

2003 IBC: Help needed for membrane penetrations of 1/2 hour rated assemblies using the exception to 708.3 & 711.3. 713.3.2 & 712.4.2 have req's for min 1 hour assemblies. What do we do with 1/2 hour assemblies? These 2 sections specifically state what to do with a recessed fixture in a 1 hour assembly (not less than) but what about other membrane penetrations in 1/2 hour assemblies? Reading these sections causes confusion concerning how to protect these penetrations since they are less than 1 hour. Thanks all.

712.4.2 tells you to look at 712.4.1.1 (install as tested in the approved assembly) or 712.4.1.2 (through-penetration firestopping). So, for example, if you are using a GA listed assembly, protect according to the listing. Where silent, firestop to at least 1/2-hour. If there is no 1/2-hour product use a 1-hour product.

For ducts and air transfer openings, see Section 716.5.4 for fire partitions and 716.6.2 for horizontal membranes.

 

[north star]

Re: Membrane penetrations through 1/2 hour assemblies

tom,

Welcome to the "New" Code Forum!