Project Challenge:
Loose concrete posed a public hazard and water infiltration
plagued many tenants in this 29-story twin-tower residential
high-rise. Klein and Hoffman (K&H) was hired to identify
the source of the problem and develop a program of remedial
repairs.
Project Solution:
K&H determined that excessive deterioration of exterior
concrete was due to the following major factors: porosity of
lightweight concrete used in the original construction; insufficient
concrete coverage over reinforcing steel, resulting in rebar
corrosion and concrete spalling; freeze/thaw cycling and extreme
temperature differential between interior and exterior floor
slab areas and failure of previous concrete repair patches due
to use of epoxy-based materials incompatible with the parent
concrete. K&H developed a multi-year repair plan with engineer's
cost estimates, allowing construction phasing based on urgency
of repairs and the owner's budget.
K&H performed a condition assessment study of the building's
windows and sliding doors which resulted in the recommendation
that these units be replaced. The replacement program is anticipated
to commence in 2006.
Due to severe leaks and ponding, the garage and north tower
roofs were replaced. The project involved stripping down the
old roofs to the concrete deck, patching concrete slabs where
required and installation of a new modified bitumen roof system
with a 20-year warranty. The leak remediation work also included
masonry repairs and installation of new roof drains.
OWNER/CLIENT: Imperial Towers
Condominium Association
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