How do I ensure fire-stopping is done correctly around duct penetrating a floor slab?
Do not build a firestop system from a generic recipe. Identify the rated assembly and use the exact approved listed firestop system for the duct, opening, annular space, backing, sealant depth, and installation conditions.
['Do not build a firestop system from a generic recipe. Identify the rated floor assembly and use the exact approved listed firestop system for the duct or sleeve, opening size, annular space, backing material, sealant depth, and installation conditions.', 'Keep the opening clean, document the listed system number, and coordinate inspection before the penetration is concealed. If the field condition does not match the listing, stop and request an approved correction.']
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.
Check
Pack the space tightly with an approved dense mineral wool insulation batting (backing material), leaving a uniform 1-inch deep pocket at the top. Fill this top pocket completely with a thick, smooth layer of UL-classified intumescent fire-stop caulk or fire-r
Steps
Stop and verify the approved project detail, foreman direction, and manufacturer or engineered requirements before acting.
Do not build a firestop system from a generic recipe. Identify the rated floor assembly and use the exact approved listed firestop system for the duct or sleeve, opening size, annular space, backing material, sealant depth, and installation conditions.
Keep the opening clean, document the listed system number, and coordinate inspection before the penetration is concealed. If the field condition does not match the listing, stop and request an approved correction.
Say this to your foreman
how do i ensure fire-stopping is done correctly around duct penetrating a floor slab?