Installation Guide for Carrier Accessory Roof Curbs

Quick Guide

This document provides installation instructions for Carrier accessory roof curbs. Installation must be performed by trained, qualified installers. Important: Gasketing is critical for water integrity; improper installation can result in air leaks and poor unit performance. Always verify curb usage against the provided tables before beginning installation.

Installation Steps

1. Verify Usage: Check Table 1 to ensure the curb part number matches your unit configuration.
2. Verify Parts: Confirm all curb parts have been received according to Tables 2-4.
3. Clearances: Ensure the curb is located to maintain proper service clearances for the unit.
4. Leveling: Ensure the curb can be installed within leveling tolerances.
5. Roof Preparation: Cut the hole in the roof for cross openings. Do not cut out the entire area underneath the curb.
6. Framing: Frame the roof opening to provide adequate structural support.
7. Assembly: Assemble the curb sides using the joining brackets and corner brackets.
8. Squaring: Ensure the curb is square by measuring equal distances across the cross corners. Once square, attach the curb to the building structure following all applicable codes.

Bracket Assembly

Different curb configurations require specific bracket types:

• Joining Bracket: Used to combine long curb sides and ends. Install on the inside of the curb, aligning with pre-punched holes. Secure with supplied bolts from the outside and wood screws at the top.
• Corner Bracket: Used to join curb sides and ends at corners. Place on the inside of the curb and secure with bolts from the outside.
• 90 Degree Joining Bracket: Used for specific long curb sides. Secure metal brackets on the inside of the curb, aligning with pre-punched holes.

Gasketing and Sealing

Proper sealing is essential to prevent water and air leakage.

• Install the sealing gasket on top of the curb perimeter flanges and duct supports.
• Clean the top surface thoroughly to remove dirt or contaminants before applying the gasket.
• Remove the adhesive paper backing and apply the gasket to the curb.
• Join gasket strips at corners, ensuring a tight fit with no gaps.
• Avoid sliding the unit into position while it rests on the curb to prevent damaging the gasket.

Field-Supplied Materials

The following materials are not included and must be provided in the field:

• Rigid Insulation: Offers thermal protection and sound attenuation.
• Cant Strip: Prevents roofing material from being forced into a 90-degree angle and aids in drainage.
• Counterflashing: Protects the upper edge of base flashing and fasteners.
• Roofing Felt and Nails: Required for sealing the roof to the curb.