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Masonry Detailing Series

01.030.0306: Base of Wall Detail - Flexible Flashing in CMU, Drip Edge, MDCD

DESCRIPTION / NARRATIVE

Details 01.030.0306 and 01.030.0306.2D (Flexible Flashing in CMU, Drip Edge, MDCD):

This detail is similar to 01.030.0302. The flashing is embedded in the outer bed joint of the CMU. Membrane flashings that are not UV resistant should not be used unless the veneer is scheduled to be installed within a short period of time. Check manufacturer’s literature for maximum exposure time allowed. Some manufacturers of mortar dropping collection devices (MDCD) recommend the flashing be terminated 6” above the device. This places the flashing 16” high at the second CMU course. If the CMU back up is covered with an Air/Moisture/Vapor barrier (AMV) however, the designer may wish to terminate the flashing in the first CMU course (8”) instead, since the wall is protected with a water-proof layer. This is more economical and avoids interference with joint reinforcing and ties which are typically installed in the second CMU course.

To get the whole picture for your project, contact IMI: 800-IMI-0988 or techresources@imiweb.org.

INFORMATION / DISCLAIMER: It is recommended to use all components of the Masonry Detailing Series (Description, 3D Detail, 2D Detail, Pictures/Figures and References) when using these details. We also encourage users to contact IMI Staff at 1-800-IMI-0988.

These details are intended for the use of industry professionals who are competent to evaluate the significance and limitations of the information provided herein. This publication should not be used as the sole guide for masonry design and construction, and IMI disclaims any and all legal responsibility for the consequences of applying the information.

It is important to note that details and construction practices vary based on geographical requirements and area practice. Masonry walls and elements must be adapted for each specific project. There are many typical details and practices, however, designers and contractors need to coordinate each detail with the unique elements of the building.