The document summarizes an engineering evaluation of a city conference center building originally constructed in 1949. The evaluation found deficiencies in the roof structure, interior walls, and floor framing that do not meet current building codes. It also noted issues with differential settlement caused by insufficient earth retention. The engineer recommends remediating the foundation, replacing the roof structure, modifying walls for stability, and other repairs. Total project costs to address the structural and site issues are estimated to be between $1.43 million to $1.82 million.

1. August 9, 2012
City Council Meeting

3. ORIGINAL 1949
STRUCTURE

4.  Staffrecognized that many of the maintenance
issues were being caused by differential
settlement
 Lastsignificant renovation took place in the
early 1980’s
 Councilapproved a SLA in the Public Works
Budget for FY 2012 to complete an evaluation

5.  Determine the current condition of the facility –
structural, electrical, mechanical, plumbing, cos
metic finishes, & site
 Identify
issues in the facility that need to be
upgraded to meet the current building code
 Identify
the main causes of the differential
movement and develop solutions to minimize
settlement in the future
 Develop
a cost estimate for recommended
improvements and modifications

9.  Originalstructure is wood framed building
supported on cast-in-place perimeter beams
on concrete footings and interior concrete
footings
 Buildingaddition was constructed primarily
with a steel frame supported on drilled priers
with cast-in-place beams and precast
concrete planks

10.  Roof Structure
 Roof framed with 2x6 rafters on 24-inch centers
 2x4 ceiling joists on 24-inch centers
 Ceiling joists are connected to the rafters with
periodic vertical supports
 HVAC units on the roof
 Roof surface appeared uneven and soft in areas
 Standing water was noted near the larger HVAC Units
 In its current state, the engineer felt that the
roof structure over the original building was
inadequate and needs to be addressed for the
building to be occupied

11.  Severalitems noted in the attic framing
contributed to this conclusion
 Rafters were spliced along the span instead of over
a support
 Rafters were cut incorrectly to allow for the
installation of HVAC equipment
 The additional loading of the HVAC and standing
water on the roof compounded the problem
 The rafters in this building, even if properly placed,
would not be sufficient to support the structural
loads on the roof for these spans (21’-8”)

14.  Interior wood walls
 Corridor walls are double framed with 2x4 studs
 Top walls are open where a top plate is typically
placed
 Consistent blocking was not noted between the
faces of the walls
 This may result in unstable walls in which the
studs do not exhibit group action and the faces
of the walls act independently

15.  Floor structure
 Wood framing consists of 2x10 joists spanning
from the concrete perimeter beam over two
triple 2x10 beams.
 Preliminary analysis of the floor system indicates
that the floor framing is insufficient for the
current building use and current building code
 Insufficient
earth retention around the
perimeter has led to the moisture infiltration
and soil subsidence.

17.  Foundation
 Floor framing system
 Address site issues surrounding structure
 Remove and replace the roof structure
 Modify the interior walls to ensure stability
 New finishes on the interior once the roof
system is installed
 Once this work has been completed, there will
likely be differential movement that causes
continual maintenance issues

18.  Anticipated cost to remediate the original 1949
structure is likely to range from $1.16M to
$1.33M
 Thesite work around the facility is likely to
range from $270K to $486K
 Total
project cost to remediate the Conference
Center is likely to range from $1.43M - $1.82M

19. REFERENCE MATERIAL

20.  2000 – “Duro Last” roof replacement
 2004 - Exterior painting
 2005 - HVAC unit replacements (9 units)
 2005 - Room 127 laminate flooring installed
 2007 - Interior painting (all areas)
 2008 - Carpet replacement
 2012 - Main electrical panel replacement