Front parapet demo

Did I mention that the front parapet was badly crumbling? If you wonder why, the answer is easy: bulk water infiltration into the masonry.

The cornice roof (a copper sheet) was supposed to shed water away from the building. Not only did the cornice roof come apart at the seams, it had bent inwards, allowing water to pond right behind the edge. To “solve” that problem, a previous owner had punched small drain holes into the copper sheet, allowing ponding water to enter the cornice interior and the masonry behind.

Some of that masonry had deteriorated so badly that someone put a layer of cement parging across it to prevent it from falling off. That, however, further aggravated the problem, because the cement parging trapped moisture and prevented the masonry from drying out.

We went around and peeled back the roofing membrane which was lapped across the parapet. Underneath that, we found rows of mostly loose brick, if we were lucky. Behind the cement parging, we found brick crumbles.

There was hardly anything to salvage. We scooped up all the loose material and slowly worked our way down until we hit solid masonry. That meant in many cases going down to the bottom of the cornice.

From this point on, we could begin to rebuild the parapet in stages, and along the way, repair the cornice.

As usual, many thanks to our skilled friends Augusta and Rubani who helped us in this adventure.

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About Marcus de la fleur

Marcus is a Registered Landscape Architect with a horticultural degree from the School of Horticulture at the Royal Botanic Gardens, Kew, and a Masters in Landscape Architecture from the University of Sheffield, UK. He developed a landscape based sustainable pilot project at 168 Elm Ave. in 2002, and has expanded his skill set to building science. Starting in 2009, Marcus applied the newly acquired expertise to the deep energy retrofit of his 100+ year old home in Chicago.

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