March 11, 2025 The West Terrace gets waterproofed
February was a significant month for preservation efforts at Fallingwater. As noted in our January and December blog posts, much of Fallingwater remains surrounded by scaffolding and protective enclosures. Inside these spaces, a variety of specialized contractors are working, assisted by our own dedicated preservation and maintenance team. Continued work on the west living room terrace, steel conservation on our window frames, grout injection into the voids within our stone walls, and repairs to degraded concrete were among the project this month. Much of the work was similar to that undertaking last winter.
Before crews could install new waterproofing membranes and flashings on the west terrace, Fallingwater’s preservation maintenance team first prepared the area by constructing plywood enclosures, insulating and heating them to ensure a warm and dry workspace. Next, each piece of the flagstone surface was numbered and removed before the existing water membranes underneath them were removed. Once the terrace was prepped for Allegheny Roofing’s crew to begin work, the old waterproofing and plywood subfloor beneath the stone was removed with new plywood installed, followed by two layers of cold-applied waterproofing membrane. Once the membrane was in place, a liquid flashing material was applied to all corners, drains and vents for added water-repellent protection. As with the east terrace, the drains will be refashioned to improve the movement of water beneath the flagstone. The finishing touch, expected in March, will be for our team to relay the stone and apply mortar into the joints.
In addition to the West Terrace waterproofing, steel conservation work occurred, focused on the double bifold glass doors leading from the Living Room to the West Terrace. Our window conservators, H.P. Steel Window Restoration, secured and stabilized the door track supporting the bifold doors. The conservation of a further selection of window frames also kept our contractor busy, with a full glass replacement of all doors in the house slated for later in 2025.