Update: Conservation of the MMA Science Library Building

Jascin N. Leonardo Finger • October 27, 2014

And we are off! In these photographs, you see island mason Wayne Morris along with his mason tender daughter, Andrea, the engineer, the grout and pillow anchor fabricator representative, and myself (we were a crowd!) testing the pillow anchors that are inserted into the holes they sawed into the northern façade of the MMA’s Science Library building. These pillow anchors, developed by John Wathne of Structures-North, an engineer who specializes in historic buildings and who has worked on Mitchell House, will be pumped with grout to a set PSI. In one image you see one that has been filled and resembles a pill package. Those areas were where holes in a cement block existed and where the grout filled the pillow and pushed up into the voids in the block. This is what will happen to the MMA building. The pillow will expand and fill the voids in the terracotta tiles of the NatCo system that make our building’s walls. This will stabilize the walls where you see cracking. Pillow anchors are not a new thing – they are typically long and resemble a sock. But these flat, square anchors were developed by the engineer specifically for our building.


Now that the test is complete, anchors and grout are on order. Scaffolding is up around the chimney on the back of the building where the mason will be re-pointing and rebuilding the top of the chimney which vents the furnace. Then, he will move to the front of the building and replace the steel lintels under the windows, install the pillow anchors, and repair the terracotta tiles where there has been map cracking. Once this work is complete, stucco will be reapplied to fill in the openings on the face of the building, work will be completed to the gutters and downspouts, and then painting will be completed to the building. The building will also likely get darker, returning to more of a grey tone as it was when it was built. All of this exterior work has been funded by the Community Preservation Act. Stay tuned as the work progresses!


JNLF

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By Jascin N. Leonardo Finger April 6, 2026
Well, actually replace the roof! With funding from the Community Preservation Act and the work of Lydon and Sons, Inc. the Mitchell House is getting a new roof. The current one had come to the end of its useful life. A cedar roof can last a long time – longer than asphalt – and is more historically accurate. The roof we are removing was installed in about 1992 – replacing a roof from the 1930s that was not cedar but a combination of materials that actually yes, did last sixty years. The unfortunate issue has arisen that the roofwalk (walk) has to be replaced. This is NOT the original walk – nor that old of a walk. It’s likely from the 1970s or so and has been cobbled at over time. It’s not a functioning walk – no one is allowed on it – but the Mitchell House needs it none the less. Maria Mitchell and her father, William, likely used the walk for astronomical observations – in addition to the yard – but the walk is also protected as part of the preservation easement on the House. Walks – NOT and NEVER called widow’s walks – were used for preventing and putting out chimney fire and roof fires. In a place where wood was expensive and had to be brought from “the main” these were purely utilitarian. What good Quaker (or non-Quaker) would build a platform for his wife to stare out to the harbor to see if her husband was on his way home? The other issue is that the walk was completely resting on the ridge board – and actually was notched to accept the pitch and tip of the ridge board so they couldn’t work around it. I suspect this may have been the ways walks were once built – and also a crafty and smart thinking carpenter who came up with the idea. It makes the walk lower. But between that issue and the age of the walk and then the blizzard of February 2026 that packed gusts over 83 MPH (that’s Category 1 hurricane winds) the walk gave in. Balusters had been knocked out and the railings were loose and pulling away from the posts. So, we will also be working with Barber and Sons to create a new roofwalk – and they agreed to do this for us quickly which is also no small feat given how busy everyone is these days. So from the bottom of the Mitchell House’s heart (and mine) a big thank you to Chris Lydon and Lydon and Sons and crew, Barber and Sons / Beau and Nate Barber, the Community Preservation Committee, and Nantucket Preservation Trust (our easement holder)! JNLF
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“If you don’t look, you don’t see. You have to go and look.” -Edith Andrews
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