9 Chase Installations
A. Construct the Chase | Gas line holes and other openings should be caulked with |
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A chase is a vertical boxlike structure built to enclose the | high temperature caulk or stuffed with unfaced fiberglass |
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insulation. If the fireplace is being installed on a cement |
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fireplace and/or its vent system. Vertical chimneys that |
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slab, we recommend that in cold climates, a sheet of |
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run on the outside of a building must be installed inside a |
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plywood or other raised platform be placed underneath to |
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chase. |
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prevent conducting cold up into the room. |
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Construction of the chase may vary with the type of build- |
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Three examples of chase applications are shown in Fig- |
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ing. These instructions are not substitutes for the require- |
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ure 9.2. |
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ments of local building codes. Local building codes MUST |
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be checked. |
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| 1. Fireplace and chimney enclosed in an exterior chase. |
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A chase should be constructed in the manner of all outside |
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| 2. Chimney offset through exterior wall and enclosed in chase. |
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walls of the home to prevent cold air drafting problems. The |
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| 3. Chase constructed on roof. |
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chase should not break the outside building envelope in |
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any manner. All outer walls need to be insulated. |
| Note: In cooler climates, all chase walls should be insulated. |
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Building codes require false ceiling and ceiling firestops |
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at each floor of the chase or every 10 ft (3.05 m) of clear |
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space to control spread of fire. |
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Walls, ceiling, base plate and cantilever floor at the first |
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level of the chase should be insulated. See Figure 9.1. |
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Vapor and air infiltration barriers should be installed in the |
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chase as per regional codes for the rest of the home. Addi- |
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tionally, Hearth & Home Technologies recommends that the |
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inside surfaces be sheet rocked and taped (or the use of an |
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1 |
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equivalent method) for maximum air tightness. |
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Round Termination Cap | Figure 9.2 | Chase Constructions | |
Metal Chase Top | Warning! You must install false ceilings and ceiling fire- | ||
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| Ceiling | stops at each floor of the chase or every 10 ft (3.05 m) to | |
| Firestop | control spread of fire. | |
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| Warning! Risk of Fire! Do NOT seal area between | |
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| firestop opening and chimney pipe except where they enter | |
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| the attic or leave the | |
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| 600° F sealant). | |
| False Ceiling | Warning! Risk of Fire! You must maintain a minimum | |
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| 2 in. (51 mm) air space clearance to insulation and other | |
| Attic | materials surrounding the chimney system. | |
Tabs | Insulation | • Insulation and other materials must be firmly secured to | |
| Shield | prevent accidental contact with chimney system. | |
| Insulation in the | ||
| • Failure to prevent contact between insulation or other | ||
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Insulation | of the chase | materials and chimney system may cause overheating | |
Insulation | and fire. |
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False Ceiling | False Ceiling |
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| Chimney |
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Ceiling |
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Firestop |
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Figure 9.1 | Chase Assembly |
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32 | Heatilator • Birmingham BIR42 • |