01.030.0302: Base of Wall Detail - Flexible Flashing, Drip Edge, Term Bar, MDCD

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DESCRIPTION / NARRATIVE

Details 01.030.0302 and 01.030.0302.2D (Flexible Flashing, Drip Edge, Termination Bar, MDCD):

Mortar dropping collection devices (MDCD) are used to help prevent the weep vents from becoming clogged with mortar droppings. (Figure 8).  Good workmanship is still required to minimize mortar droppings in the cavity.  There are various types of weep vents available (Figures 9 & 10). These devices allow water to pass out of the wall and permit air to circulate in the wall.  To accomplish a “vented” air space, weep vents must also be placed at the top of the wall.  Compartmentation should be considered when designing vented walls. These weep vents can be made of UV resistant plastics, metal or mesh type materials.  Weep vents should be placed at 16” or 24” o.c.  Closer spacing improves drainage and air circulation.

Related IMI Tech Briefs (pdf)
2.7.3: Flashing Installation: Masonry Veneer
2.12.2: Reviewing Construction Documents: Architectural Drawings Part 1 of 2
2.12.4: Masonry Cavity Walls: Systems and Construction

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.