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

AIA Credits 0.25 LU|HSW

Published 18 Aug 2022