How to Air-Seal Electrical and Plumbing Penetrations in an Attic
Nov 4, 2010 · In some jurisdictions, these penetrations require that we use a fire-blocking type of sealant — either a fire-block caulking like this, or a fire-rated foam type of sealant. The caulking is good for real small gaps, but because we’ve got a pretty good-size hole, even around the wires, we’re going to use a spray foam that can expand around ...
Sealing PEX and PVC pipe penetrations - GreenBuildingAdvisor
Feb 27, 2013 · Exception: water soluble, gypsum-based caulking or other sealants approved by the PEX tube manufacturer. – Petroleum-based materials or sealants such as: Kerosene, Benzene, Gasoline, Solvents, Fuel – Oils, Cutting Oils, Asphaltic Paint, and Asphaltic Road Materials, Acetone, Toluene, and/or Xylene. – Do not place any PEX tubing in heavily ...
Using intumesent firestop sealants to air seal electrical outlets in ...
Feb 16, 2010 · We are trying to determine if there are any issues with using standard firestop sealants such as STI LCI-305 or Hilti CP606 to air seal the exterior of electrical outlets. Looks like the stuff will shrink but is it enough to compromise the air seal ? Can anyone suggest an alternative product or method for air sealing outlets in a min. 1-hr rated partition wall ? The Hilti …
Safe to use caulk to air seal around wires coming into the outlet …
Oct 30, 2018 · It’s usually only rated up to a few hundred degrees or so. Intumescent caulk is intended to keep fires from propagating by sealing any gaps when a fire gets going. The other kind of fire rated caulk is intended to stay put and NOT do anything when there is a fire. This type is more like regular silicone, but it’s rated up to 600+ degrees.
Air-Sealing Electrical Penetrations - GreenBuildingAdvisor
Apr 12, 2023 · Interior holes should be sealed with fire rated caulk, e.g. 3M IC15WB or CP25WB, available from Home Depot and Lowes etc. Applied with a standard caulk/sealant gun, this takes only slightly more time than spray foam. If the gap is larger than ~1/8", pack it first with non-flammable rock wool, then cover that with the fire rated caulk.
Air sealing and fire blocking PEX and PVC penetrations
Feb 26, 2013 · These materials are oxygen barrier PEX, and Red and Blue PEX, and PVC; passing through drywall, plywood, dimensional lumber. PVC and PEX expand and contract, tearing away from sealants and foams. They squeal and squeak, crackle and pop when heating up and when/if tighly anchored, rounding bends, rubbing against each other, against wood …
Rockwool insulation vapor barrier inside chimney?
May 27, 2019 · The inspector told us that he wanted to see (for the future rough insulation inspection) a vapor barrier on the Rockwool we used in the chimney chase. There was no insulation in the chase before… and we decided to go with Rockwool over fiberglass batt insulation (which would have had its own integrated vapor barrier of course) for this location.
How can I seal DensGlass (exterior drywall)? - Green Building Advisor
May 23, 2012 · Use backer rod for openings larger than 1/8” (3 mm). Method 2) Apply glass mesh joint tape to all joints, overlapping at intersections by the width of the tape. Apply approximately 3/8” (9 mm) bead of caulk along the joint. Embed the caulk into the entire surface of the tape with a trowel. Use backer rod for openings larger than 1/8” (3 mm).
Tape for DensGlass Sheathing - GreenBuildingAdvisor
Dec 18, 2020 · I would test whichever tape you choose on the densglas before trusting it. Densglas is a bit of a funny material and I've found a lot of tapes don't like to stay stuck to it for the longer term, not unlike taping polyethylene.
The best way to seal electrical boxes? - GreenBuildingAdvisor
Jan 27, 2019 · You can seal the electrical boxes with fire rated silicone caulk (not intumescent fire caulk). You can also use the orange great stuf foam, but I like the fire caulk better. Try not to get a lot inside the box, just seal the holes and the edge of the box where it meets the drywall. If you don’t have a sealed combustion furnace (two pipes to ...