Uploaded February 2026 | Updated September 2026, 1 hour ago
Roof parapets are a major cause of leaks in buildings with flat or low-sloped roofs, and one detail in particular is almost guaranteed to fail. This is because stucco acts as a reservoir cladding, absorbing and storing water, which leads to the buildup of hydrostatic pressure and eventual leaks, especially when directly applied to masonry block walls without proper flashing. Architects and designers must stop specifying this detail, as it guarantees expensive, recurring issues and complicates projects far more than simply using a proper metal or stone coping.
*Get the Flat Roof Design Guides and CAD Details* : asiri-designs.com/shop
*Request Building Science Consulting Services For Your Project:* asiri-designs.com/consulting
*Other Flat Roof Articles and Resources* : asiri-designs.com/resources-1?blogcategory=Flat+Roofs
Roof parapets are a major cause of leaks in buildings with flat or low-sloped roofs, and one detail in particular is almost guaranteed to fail. This is because stucco acts as a reservoir cladding, absorbing and storing water, which leads to the buildup of hydrostatic pressure and eventual leaks, especially when directly applied to masonry block walls without proper flashing. Architects and designers must stop specifying this detail, as it guarantees expensive, recurring issues and complicates projects far more than simply using a proper metal or stone coping.
*Get the Flat Roof Design Guides and CAD Details* : asiri-designs.com/shop
*Request Building Science Consulting Services For Your Project:* asiri-designs.com/consulting
*Other Flat Roof Articles and Resources* : asiri-designs.com/resources-1?blogcategory=Flat+Roofs
