Masonry Magazine August 1993 Page. 10
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able to move separately since the flue liner usually gets warmer than the cap. However, the non-metal cap should be anchored to the chimney below. In order to properly anchor caps, it may be necessary to penetrate the flashing with the anchor (Figure 2).
To prevent water from entering the wall at these points, it's necessary that the penetrations be adequately sealed, or the flashing will fail to function as intended. Bituminous mastics are often used to seal these penetrations.
All chimney caps should slope downward from the flue liner to the edge of the chimney wall at least three inches per foot. A sealant must be used between the flue liner and the cap. The required distance between the top of the installed cap and the top of the flue liner must be maintained. Check local building codes for required distances.
Pre-cast Concrete and Stone Chimney Caps
Pre-cast concrete and stone chimney caps can be found in some hardware stores and building supply outlets. They should be at least two inches thick at the minimum; the lowest height of the required slope. The cap should fit loosely around the flue liner to permit possible expansion of the flue. The cap should be at least 2½ inches wider than the outside chimney wall dimension, and a drip should be incorporated to shed water away from the chimney wall.
Cast-in-Place Concrete Chimney Caps
Cast-in-place concrete caps require a form. It may be custom constructed or an adjustable form can be used. The cap should be reinforced with at least ½" mesh, galvanized hardware cloth, located halfway into the filled form. The reinforcing must be continuous around the corners.
Metal Chimney Caps
Metal caps are not as common as concrete or masonry caps and are usually pre-fabricated. Metal caps must lap down the chimney face at least four inches. Metal caps are generally held in place by friction, although they are sometimes nailed into the vertical sides of the chimney. A compatible resilient sealant must be used between the metal cap and the flue liner and between the base of the metal flap and the chimney. REPRINTED, with permission, from Brick Institute of America.
Walsh Group Chicago Gold Medal Winner
Unique Productions
6590 S. 1800 East
Spanish Fork, UT 84660
1 800 748-4455
Fax 1-801-373-3891
THE FIRM OF SOLOMON, Cordwell, Buenz and Associates, Ceisel Masonry and Stefan Friedrich (job foreman), were given Gold Medal awards for their project, the Walsh Group Headquarters in Chicago, Illinois (pictured above), during the Illinois-Indiana Masonry Council's nineteenth annual Excellence in Masonry Architectural Awards banquet, held in May in Itasca, Illinois. Another gold medal award was presented to Skidmore Owings and Merrill A.L.L. Masonry Construction and Leonard Puig (job foreman), for the AT&T Corporate Center/USG Building, Chicago.
10 MASONRY-JULY/AUGUST, 1993