PEX Firestop question

[dcat]

Hello,
I am running eight 1/2 inch PEX lines from a bath to a laundry closet. I would like to drop the PEX from the ceiling in two rows of 4, for a neat drop into my manifold. The manifold will be mounted on the wall (not in the wall) of the Laundry room (as are 2 others sourced from the floor). I keep getting mixed advice regarding the proper fire stopping. I was going to pre-drill a 2x6, use PVC bends to make the drops neat, and use approved caulk to seal the void between the PEX and PVC. There is 4 1/2" rigid insulation and 5/8" drywall the pex would drop through. Any comments or suggestions on a better idea would be awesome! Thank...

 

[Sjsmithjr]

Do you mean "fireblocking" instead of "firestopping"? Firestopping refers to protecting a penetration to the same degree as the fire rated assembly being penetrated. Fireblocking will slow air from feeding a fire and resist the spread of flame and embers in a concealed space such as a wall. There's a lot more to both than just applying fire rated caulk or foam around a pipe or wire in a hole. Hilti offers details re the means and methods and your local or state building codes and/or fire Marshall's office can inform you of the requirements. What kind of conflicting advice have you been given and by who?

 

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[dcat]

Do you mean "fireblocking" instead of "firestopping"? Firestopping refers to protecting a penetration to the same degree as the fire rated assembly being penetrated. Fireblocking will slow air from feeding a fire and resist the spread of flame and embers in a concealed space such as a wall. There's a lot more to both than just applying fire rated caulk or foam around a pipe or wire in a hole. Hilti offers details re the means and methods and your local or state building codes and/or fire Marshall's office can inform you of the requirements. What kind of conflicting advice have you been given and by who?

Hello Stan and thank you for responding!
I have been told that the pex must be 18" apart and I don't see how that could be possible, particularly when I know hot and cold pex lines are run like this frequently. I am looking at the requirements for building code because I want to make sure this is done properly the first time. I can call the township, I just thought there would be more people out here familiar with pex radiant heating applications who could point me in the right direction.

 

[Sjsmithjr]

If you haven't already, take a look at Uphonor's plumbing system installation manual for and also the details on HILT's website. There is reference to 18-inch spacing, 3 pipes per penetration, etc. but ultimately you will need to meet your local requirements for construction.

 

[dcat]

If you haven't already, take a look at Uphonor's plumbing system installation manual for and also the details on HILT's website. There is reference to 18-inch spacing, 3 pipes per penetration, etc. but ultimately you will need to meet your local requirements for construction.

Thank you Sam. My architect was also helpful since I am passing through ceiling drywall and not a sill plate where fire could travel from one contained space to another.