Most modern flat-roofed construction, whether residential or otherwise, includes these walls at the edges as a matter of safety, both to prevent people from accidentally falling off the roof and to prevent accumulated debris from falling off and possibly injuring people below. Why should you repair a failing parapet wall? Badly damaged parapet walls pose a serious risk to pedestrians walking beneath the building. Loose brick may fall and seriously injure someone. Also, the top of a parapet wall is vulnerable to moisture penetration problems. Choosing an appropriate cap is an effective way to eliminate this condition. To protect moisture from entering through the top of the wall, a continuous flashing membrane should be installed directly beneath the mortar joint below the cap.
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