Is It Time to Retire the Metal Sill Pan
Course Description
Metal sill pans have been used beneath windows for centuries to successfully protect the openings into which we install them. But is there a better way? Fluid and self-adhered membranes can conform more easily to complex geometries (origami with metal is difficult!) and any membrane at the sill can be continuous with whatever membrane is used at the jambs, reducing risk. But can fluids reliably span the gaps at openings? And are membranes less durable than their metal counterparts? This short presentation discusses both approaches to detailing windows at the sill (metal and membrane), showing examples (photos and sketches) of each, and makes the case that membrane sill pans are typically the more reliable choice.
Course Instructor Christine Williamson
Course Length 12:30
Published 18 Aug 2022
Please note: viewing this course and completing this quiz do not currently count towards AIA CEU credits.
Keywords: building science, energy efficiency, air barriers, air tightness, window details, sill pans, window detailing, water management