Blueprint Reading & Specifications Flashcards

A mechanical drawing shows a 4-inch pipe penetrating a 2-hour rated wall with 1-inch annular space. Which specification element is most critical for selecting the correct firestop system?

Answer: The assembly type, penetrant size, and annular space dimensions together

The UL-listed system must match the specific combination of assembly rating, penetrant type/size, and annular space to maintain the required fire resistance.

What does the 'T Rating' in a through-penetration firestop system indicate?

Answer: The time before the temperature on the unexposed side rises more than 325°F above ambient

The T Rating (Temperature Rating) indicates the hours before the unexposed face temperature rises more than 325°F (181°C) above initial temperature, limiting heat transfer through the system.

On architectural drawings, a keynote or general note that reads 'All penetrations through fire-rated assemblies shall be firestopped per UL design numbers as listed in schedule on A-101' is an example of:

Answer: A reference specification directing the contractor to a coordinated schedule

This note functions as a reference specification by directing the installer to a specific schedule listing the required UL design numbers, coordinating drawings and specifications.

Which section of the CSI MasterFormat 3-part specification contains firestop product data, UL system numbers, and material standards?

Answer: Part 2 – Products

Part 2 – Products covers acceptable materials, product standards, and listed system references such as UL design numbers.

When reading a building section drawing, a firestop installer should pay particular attention to:

Answer: Horizontal lines indicating rated floor assemblies and their hourly ratings

Building section drawings reveal which horizontal assemblies are fire-rated floor-ceiling constructions, identifying where through-penetrations require listed firestop systems.

A drawing note references 'IBC Section 714' regarding through-penetrations. This directs the contractor to:

Answer: The International Building Code requirements for firestop system testing and installation

IBC Section 714 contains the International Building Code's requirements for through-penetration firestop systems, including testing standards and installation criteria.

In a project specification, the phrase 'or approved equal' following a listed UL system number means:

Answer: An alternate listed system meeting equivalent performance may be submitted for approval

'Or approved equal' allows substitution of a different listed system that meets equivalent performance criteria, subject to the architect's or engineer's review and approval.