Lbartowski
Member
- Location
- MN
Do both 1 and 2 hour rated walls required fire rated "putty packs" on any 1900 boxes that penetrate these walls?
1 & 2 Hour Rated Walls
- Thread starter Lbartowski
- Start date
The requirement depends on the spacing of the boxes.
Here is a guideline.
www.stifirestop.com
Here is a guideline.
Firestop Putty Pads – When, Where and How to Use Them
One of the least publicized and most misunderstood products in the SpecSeal® line would have to be our putty pads. At the request of several of our customers, we’re going to attempt to remove the shroud of mystery surrounding this product by answering some of the most commonly asked questions...
www.stifirestop.com
Lbartowski
Member
- Location
- MN
...based on your response I assume it makes no difference whether it's a 1 hour rated wall or 2...
Strathead
Senior Member
- Location
- Ocala, Florida, USA
- Occupation
- Electrician/Estimator/Project Manager/Superintendent
Yes, you are correct, 1 hour and 2 hour walls have the same guidelines in regards to the application of putty pads. From here though, I strongly recommend you do your own research. A big "for example" is you can't use a putty pad on a 3 gang masonry box per the listing. Yet this is an extremely common box in the corridor fire walls at a hospital. You can gen an "engineering judgement" from virtually all manufacturers that deems it acceptable, but then you still need your Architect and potentially your AHJ to sign off on it. Otherwise the boxes must be five sided.