Originally Posted By: David Suelflow This post was automatically imported from our archived forum.
Where can I get a list of approved fire/draft stopping material. I just did one where they used steel wool. Last time I checked (as a kid with a lighter) that stuff burns.
Originally Posted By: mpetner This post was automatically imported from our archived forum.
UL puts out a publication on this stuff. I can’t think of the name of the volume of books it has on this right now. Fire ratings of penetrations of pipe/conduit through rated assemblies are assigned system design numbers. I’ll try to dig up the books. It’ll give you the hourly rating of it, if that’s what you’re looking for.
Originally Posted By: Susan This post was automatically imported from our archived forum.
David,
The IRC (I have the 2000 as that is what I inspect under in my jurisdiction) discusses required fireblocking and materials and unfaced fiberglass in section R602.8.
Here's the Materials section (R602.8.1)
Except as provided in Section R602.8, Item 4, fireblocking shall consist of 2 inch nominal lumber, or two thicknesses of 1 inch nominal lumber with broken lap joints, or one thickness of 23/32 inch wood structural panels with joints backed by 23/32 inch wood structural panels or one thickness of 3/4 inch particleboard with joints backed by 3/4 inch particleboard, 1/2 inch gypsum board, or 1/4 inch cement based millboard. Batts or blankets of mineral wool or glass fiber or other approved materials installed in such a manner as to be securely retained in place shall be permitted as an acceptable fire block. Loose fill insulation material shall not be used as a fire block unless specifically tested in the form and manner intended for use to demonstrate its ability to remain in place and to retard the spread of fire and hot gases.
R602.8.1.1 Unfaced fiberglass. Unfaced fiberglass batt insulation used as fireblocking shall fill the entire cross section of the wall cavity to a minimum height of 16 inches measured vertically. When piping, conduit or similar obstructions are encountered, the insulation shall be packed tightly around the obstruction.
Most materials (as an example, the spray foam, fire caulks, etc.) have a U.L. number and smoke/flame number on the container.
Originally Posted By: Ryan Jackson This post was automatically imported from our archived forum.
Susan wrote:
Ryan,
Draftstopping requirements are covered in the IRC 2000, p. 86. R502.12
I'm just trying to make sure everyone is on the same page. Earlier someone wrote that if it allowed passage of air its not a fireblock.
I don't have my book here, could you post the locations in which draftstops are required? Again, I'm trying to clarify the difference between a draftstop (like in an attic/floor) vs. a fireblock (like in concealed construction to prevent the passage of flame from vertical to horizontal).
Originally Posted By: Susan This post was automatically imported from our archived forum.
Ok, here it is…
R502.12 Draftstopping required.
When there is usable space both above and below the concealed space of a floor/ceiling assembly, draftstops shall be installed so that the area of the concealed space does not exceed 1,000 square feet. Draftstopping shall divide the concealed space into approximately equal areas. Where the assembly is enclosed by a floor membrane above and a ceiling membrane below draftstopping shall be provided in floor/ceiling assemblies under the following circumstances:
1. Ceiling is suspended under the floor framing.
2. Floor framing is constructed of truss type open web or perforated
members.
R502.12.1 Materials.
Draftstopping materials shall not be less than 1/2 inch gypsum board, 3/8 inch wood structural panels, 3/8 inch Type 2-M-W particleboard or other approved materials adequately supported. Draftstopping shall be installed parallel to the floor framing members unless otherwise approved by the building official. The integrity of all draftstops shall be maintained.
I believe an example of this would be a finished basement where there are acoustical tiles on the ceiling or perhaps a garage area with living space above.
