When most people think of the "Green" movement they usually think about Global Warming or recycling. The Green movement is not just about recycling, especially when you are discussing building products and sustainable building practices. While building products are evaluated by the LEED system for their recycled content as well as sustainability, they are frequently overlooked by some for their energy efficiency.
A discussion about Weep Screed and its effectiveness as an energy efficient trim and potential Green product is important to any building with a cement plaster exterior. Foundation Weep Screeds are typically installed to allow moisture to weep out from behind the plaster coat; however, the possible energy loss from them can be overlooked at times.
If there is a space between the bottom flange of the Weep Screed and a building's foundation (frequently caused by an offset sheer panel), the possibility of airflow between the interior and exterior of a building, and vice versa, may exist. Due diligence must be exercised to ensure that weep screeds are resting against the foundation. Failure to do so will allow hot or cold air to enter or escape at will. Insects and small rodents may also have the same opportunity.
Weep Screeds are available with an extended lower sloped flange that will close the gap created by sheer panels or uneven foundations (click her for an example). Local codes may require filling all visible gaps, yet weep screed gaps are not visible unless you get on your knees and physically make a proper inspection.
In extreme hot or cold climates, a closed cell backer rod could be added to form a seal between the foundation and the weep screed. Choose a backer rod sufficient in size to fill the void between the "V"-shaped weep screed and the foundation with a minimum 1/4" compression (backer rod is not recommended when Weep Screeds are perforated). Weep Screeds and backer rod should be installed at the same time.
Exterior stud walls that require sheer panels in certain areas and open framing for the balance of the wall should be furred out at each stud with furring strips that are the same thickness as sheer panels. The furring strips will ensure a straight wall as well as a uniform stucco thickness.
When discussing the Green movement within the building industry many architects and contractors think about potential LEED Credits that certain building products and designs will bring to their project. The energy efficiency of a building can be greatly enhanced with the proper installation of all Foundation Weep Screeds. Do your part to contribute to the Green Building Movement and be sure the gap is filled.
Written by: Gary Jayne
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