HomeMy WebLinkAboutEngineer's Field Observations 02.24.2012KURTZ & ASSOCIATES, INC.
5012 County Road 154
Glenwood Springs, CO 81601
39 MOSHER: Observations 02/24/2012
STRUCTURAL CONSULTANTS
Phone (970) 945 6305
The floor elevation of 39 Mosher appears to be higher than the elevation of Mosher Ave.
to the south of the building. On the north end of the building there are areas of localized,
negative drainage, where the surface drainage appears to be directed towards the building.
The building at 39 Mosher displays differential foundation settlement. The east side of the
building appears to have settled to the west, and the north end has settled relative to the
south. along the length of the building the settlement appears to be relatively uniform.
The exterior, precast, wall panels display some distress and potential panel -to -panel
connection failure. On both the east and west walls three adjacent vertical panel joints
display vertical cracking in the face slab of the wall panels directly adjacent to joint and/or
separation of the panel -to -panel joint. ( West wall: see photo 1424.jpg) The wall
cracking widens at the top of the wall panels, indicating a differential settlement from
north -to -south.
Lateral displacement between the wall panels on the south side of the building as opposed
to the east side of the building was observed at the southeast corner of the building. (See
photo 1427.jpg)
The interior slab -on -grade floor at 39 Mosher displays significant differential settlement.
The slab is divided with a series of construction joints. Joints running east -to -west across
the building are spaced at 15'-0" on center. There are two north -to -south joints dividing
the slab in that direction into three (3) sections. The east and west sections have settled
relative to the center section. There is a vertical displacement of 1" to 1.3/4" at the
construction joint between the center section and the west section, and the west section
slopes down to the west at a rate of 1.3/4" per 48". There is a vertical displacement of 1"
to 1.3/4" between the center section and the east section, and the east section slopes down
to the east at a rate of 1/2" per 48".
There is an exterior concrete apron on the north side of the building (slab -on -grade) which
measures, in plan, 5'-0" north -to -south by 20'-0" east -to -west. The slab appears to have
been affected by the negative drainage on this side of the building, and has settled
differentially. (See photo 1419.jpg)
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GLENWOOD
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Engineers • Constructors
January 31, 2013
Tamerrel Excavation, Inc.
P.O. Box 128
Parachute, CO 81635
Attn: Ken White
Re: Structural Observation at 39 Mosher Avenue, Parachute Project No. 12351
Dear Mr. White:
Glenwood Structural and Civil, Inc. was requested to observe the structure at the above referenced location and
assess its condition due to evident settlement. The visit was conducted on January 30, 2013. General building
information, observations, discussion and recommendations follow
General Building information
The structure is a single level shop of approximately 30 feet x 64 feet. It is understood that the foundation consists
of cast -in-place spread footings and a stem wall to grade providing frost protection. The floor consists of individual
precast panels laid as a slab. The walls are approximately 16 feet in height and constructed of precast concrete
consisting of an exterior flush face and interior ribs. The roof is a gable shape framed with pre-engineered trusses.
Observations
The structure appears to be settling most noticeably in the northeast corner, where the ceiling is observed to be
approximately 5 inches lower than the diagonally opposite southwest corner. The slab appears to be approximately
4 inches lower in the northeast corner than in the southwest corner. The walls appear to be somewhat out of plumb
consistent with the settlement. The northeast corner of the structure is a primary concentration point of runoff from
the yard at the north, the adjacent slab to the east, and the building's roof.
Discussion
The structure appears to be settling due to poor bearing soils combined with inadequate site drainage. However,
the extent of settlement to date does not appreciably compromise the safety of the structure. It is aur opinion that
occupancy of the structure can continue until remedial measures are implemented to stop the movement of the
structure.
Recommendations
In order to prevent compromising the integrity of the structure, further movement should be mitigated. It is our
recommendation that a design be prepared by a registered engineer, preferably with the benefit of a subsoils study
prepared by a geotechnical engineer, and that design implemented within a reasonable time frame of approximately
six months.
Please feel free to contact us for any further information or if we could be of additional service.
Thank You,
GLENWO ■ D STRU. TUBAL AND CIVIL, INC.
Adolfo r'. Gorra, M.S., P.E.
President
cc:
Garfield County c/o Matt Provost, File
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8 12 Pitkin Avenue • Glenwood Springs, CO8 I GO I • Phone (970) 928-0 135 • Fax (970) 928-9804