The Blakeley Manor project was one of several similar projects consisting of a full exterior wall rehabilitation to improve building envelope performance of an existing 4-story 70-unit senior housing facility owned and managed by the Seattle Housing Authority (SHA).  Existing exterior wall cladding of stucco installed over wire lath and building paper was removed and replaced with an innovative assembly of new plywood sheathing, continuous, higher density mineral wool insulation covered with fiber cement siding to provide 1-hr fire rating for both “outside-in” and between floors.  This was reviewed and approved through a code modification request.