Specialty Item Wall/floor Penetration (Sleeves)

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A pipe penetration, or sleeve, is a pipe which is passed through a wall for the purpose of inserting another pipe through it. Sleeves should be installed prior to a concrete pour. When installed after a pour, added core drilling or chopping and patching cause costly installation and project delays.

Sleeve Materials and Installation

Sleeves are normally fabricated or manufactured of Schedule 40 carbon steel pipe, or 1/4-inch rolled steel plate. They may also be fabricated or manufactured of stainless steel, galvanized steel, brass, cast iron, PVC, or other materials.

Sleeves of light-gauge sheet metal may also be used. Some thought, however, must be given to their ability to withstand the concrete-pouring and forming processes. Cross reference the design of light gauge steel sleeves with the firestop system design requirements.

Wall sleeves through exterior concrete walls and waterproof floors should be fabricated with full-circle, continuously-welded, water-stop plates. Water-stop plates assure positive water sealing on the sleeve’s outside diameter and act as anchors, preventing thrust movements.

Sleeves through interior concrete and masonry walls should be installed flush with both sides of the wall, or as determined in firestop system design for the specific application.

Sleeves through floors should extend 4 inches above the finished floor to provide protection against passage of fluid and debris between floors. Reference the firestop’s system design for installation location of firestop as system may require firestop to be located at the floor level and not the top of the sleeve.

Sleeve Packing

Sleeve packing materials are installed to prevent the intrusion of dirt, water, air, rodents, and foreign objects. Fire protection can be an objective of sleeve packing as well.

Packing materials add air tightness, cathodic protection, corrosion resistance, anchorage support, and shock (sound and vibration) absorption.

Common packing materials are lead-and-oakum joints, mastics, casing boots, and link seals.

Project specifications determine the types of materials required to seal the annular space between pipe and sleeve.

Firestops at sleeves

When it is required to penetrate fire-rated floors and walls with items such as pipes, a through-penetration firestop system is required. This firestop consists of specific field-installed assembly of materials designed to prevent the spread of fire through fire-rated openings. These systems can also minimize smoke flow through the penetration as well.

After the firestop system passes the ASTM E-814 test standard, it is assigned a fire and temperature and in some cases an air leakage rating. The hourly ratings are typically installed to be equal to the rating of the wall or floor.

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