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On
[date] at the request of the homeowner, our firm performed an
evaluation of the foundation at your address, your city, TX. The
evaluation was limited to a visual inspection of the exterior and a
visual inspection of the interior. An elevation survey was performed,
using a Stanley Compu-Level. This was a level “B” investigation, as
described by the Texas Board of Professional Engineers. Unless
otherwise stated, no building plans were reviewed, no soil samples
were taken, no soil tests were performed, and no destructive testing
or invasive procedures were employed. No siding, wall or floor
coverings, landscaping, furniture, or any other items causing
obstruction of visual observations were removed.
The
objective of this report is to determine if the foundation is performing
its intended function and whether or not any remedial foundation repairs
are necessary at this time.
FOUNDATION ANALYSIS
We
estimate that the structure was built in 1971. The structure is a one
story wood frame construction, single family dwelling, with brick veneer
and vinyl siding supported by a concrete slab on grade foundation. The
Southwest and Southeast corner brick wing walls have non-monolithic
foundations. The bricks of both wing walls are knit into the brick
veneer of the house. For the purposes of this report, the building is
considered to face South.
Surface water drainage away from the foundation appears acceptable on
the North side of the structure. On the West side the structure, the
soil gradient is flat which results in poor drainage of surface water
away from the foundation. On the South side of the structure, an area
with poor surface water drainage exists between the front porch and the
Southeast corner of the house, which permits surface water to collect
and pond next to the foundation due to a negative soil gradient. On the
East side of the structure, there is a 3 to 4 inch depression in the
soil level near the master bathroom which permits surface water to
collect and pond next to the foundation. Presently there are no rain
gutters installed on this structure.
There are several mature trees around the house that are close enough to
the structure to have an impact on the performance of the soils
supporting the foundation. When tree root systems encounter soils
beneath the foundation, they may utilize this as an additional water
source during drier summer seasons to supplement their moisture needs.
The
foundation is concrete slab on grade. The slab appears to be reinforced
but the type of reinforcement could not be determined.
There are both interior and exterior signs of distress that indicate
differential foundation movement (see attached Foundation Investigation
Observations drawing):
Interior
Observations:
I1 – A previously
repaired sheet rock crack above the upper right corner of the Southwest
master bedroom window.
I2 – A previously repaired sheet rock crack above the upper left corner
of the Northwest master bedroom window.
I3 – Previously repaired sheet rock cracks above both the upper right
and upper left corners of the master bedroom door to bathroom door on
the master bedroom side.
I4 – A 1/16 inch wide vertical sheet rock crack above the upper left
corner of master bedroom closet door on the master bedroom side.
I5 – A 1/16 inch vertical sheet rock crack above the upper right corner
of master bedroom to bathroom door on the bathroom side.
I6 – Damage to ceiling sheet rock panels which appears to be from roof
water leakage.
I7 – A 1/16 inch wide vertical sheet rock crack above the upper left
corner of the master bathroom to office door on the bathroom side. This
door sticks during summer months according to the homeowner. The door
opens and closes freely at this time.
I8 – A 1/16 inch wide diagonal sheet rock crack at the upper right
corner of the master bathroom to office door on the office side.
I9 – A hairline horizontal sheet rock crack at upper right corner of the
office closet door on the office side.
I10 – A 1/16 inch vertical sheet rock crack at the upper right corner of
doorway into the living room.
I11 – Numerous slab cracks in the garage floor varying from 1/16 to 1/8
inches in width. The garage walls are finished with wood paneling.
Exterior Observations:
E1
– A vertical brick crack which extends from the top of the slab to the
top of the wall. This crack
is ¼ inch wide at the top of the slab and is ¾ inch wide at the top of
the wall.
E2 – Multiple 1/8 inch wide vertical brick cracks on the West side of
the southwest corner of the structure where the wing wall bricks are
knit into the brick veneer of the house wall.
E3 – A ¼ inch wide crack in the concrete driveway.
E4 – A previously repaired vertical brick crack on the South side of
the Southeast corner of the structure where the wing wall bricks are
knit into the brick veneer of the house wall.
E5 – A ½ inch wide crack in the back yard non-monolithic patio
concrete slab.
E6 – A ¼ inch wide crack in the back yard non-monolithic patio
concrete slab.
E7 – A foundation corner wedge crack.
E8 – A foundation corner wedge crack.
E9 – A 3 to 4 inch depression in the soil level adjacent to
foundation.
E10 – The outdoor air conditioning unit concrete support pad has
settled and tilts towards the front of the house.
E11 – A 1/16 inch wide vertical brick crack which starts at the top of
the slab and propagates up 3 feet to where it becomes a 1/8 inch wide
stair step brick mortar crack. This
stair step brick mortar crack terminates at the lower left (South)
corner of the bathroom windowsill where it is ¼ inch wide.
E12 – A 1/16 inch wide trim separation between the brick veneer and
the left (South) side of the bathroom window frame.
E13 – A 1/8” wide vertical and stair step brick crack from the air
conditioning unit supply line to the lower right (North) corner of the
bathroom window sill.
E14 – A negative soil gradient area, which allows surface water to
collect and pond next to the foundation.
E15 – The bottoms of all four wooden front porch roof support columns
show evidence of wood rot.
The
attached relative elevation survey diagram shows that the foundation has
settled along the East side of the structure.
The maximum elevation changes were observed in this area.
The foundation has settled approximately -1.0 to -1.8 inches on
this side of the structure. The
brick cracks on the West side of the garage show the foundation has
heaved in this area. The
Southwest corner of the garage has heaved approximately +1.2 inches.
Given the age and value of the home, the foundation is not level
within acceptable tolerances.
CONCLUSIONS
The foundation has experienced
sufficient downward movement (settlement) to require some remedial
repairs at this time on the East side of the structure.
RECOMMENDATIONS
We recommend that 10 foundation supports be installed in the
locations shown on the attached diagram.
The following types of supports are recommended:
concrete drilled piers, steel pilings or concrete pilings.
After the
foundation supports are installed, the foundation should be lifted to as
near as level a position as circumstances permit.
The complete leveling of the affected areas should not be
expected. Fully leveling
homes that have suffered from foundation movement is often not
economically reasonable. Some
slopes will remain after repairs are completed.
Once
foundation repairs are completed, the sanitary drain system should be
hydrostatically tested to slab elevation and the city water supply
should be pressure tested for possible leaks by a plumber. Any
leaks encountered should be immediately repaired to prevent future
foundation damage.
Consult
with and select a foundation repair company to implement our plan of
repair. It would be prudent
to have the foundation contractor selected provide the services of a
professional engineer licensed in the state of Texas who will inspect
and certify completion of your foundation repairs.
At this time drainage improvements are needed on the East, West and
South sides of the structure. Ideally,
the soil gradient away from
foundation walls should fall a minimum of 6 inches within the first 10
feet and provide a minimum 4 inch space between the bottom course of
bricks and the ground. Other
drainage improvement options include installation of drainpipe and catch
basin systems, which would discharge in front of the house at the street
curb. Installation of rain gutters on the entire structure would
also improve water drainage away from the foundation in these areas.
If drainpipes and rain gutters are installed, it is recommended
that all gutter downspouts should be connected to the drainpipe system.
Several
mature trees are close enough to the house to have an impact.
It is not recommended that trees remain in close proximity to the
foundation due to the vast amounts of water that trees may absorb from
soils beneath the foundation. Removal
of these trees or installation of a root barrier is recommended.
IMPORTANT
LIMITATIONS
The
opinions given in this report are based on my assessment made at the
time of this review. The
items observed during this site visit represent general conditions
observed and do not necessarily represent all defects which may be
present in the dwelling. It
should be noted that if the house has been recently repaired, remodeled
and/or repainted, that many times defects are covered up which might be
an indication of differential foundation movement.
The positions and conditions of foundations change continuously
in response to changes in weather, climate, vegetation, drainage, and
other factors. This report,
including the conclusions and recommendations contained herein, is based
on the condition of the subject property at the time the property was
inspected.
This
report is prepared for the exclusive use of the homeowner.
Permission for use of this report by any other persons for any
purpose or by the client for any other purpose is denied unless
otherwise obtained and stated in writing.
The
failure to properly maintain a foundation can lead to significant
foundation movement over relatively short periods of time.
In response to droughts, foundations can settle at rates in
excess of an inch per month for several consecutive months.
In response to heavy rains following droughts, foundations can be
lifted at rates that substantially exceed an inch per month.
Since relatively minor foundation movement can sometimes cause
cosmetic damage to homes, the condition of the subject property can
change rapidly. In response
to changes in the soil moisture level of the soils beneath the slab,
some or all portions of the foundation may experience additional
foundation movement after these repairs are completed.
Original
design of a foundation is typically based upon economic considerations
balanced against acceptable risk, soil type, foundation geometry and
structural loadings. Unless
specified, our firm had no access to original foundation design
documents. Because we did
not witness the original construction of this building, we make no
statements concerning the structural quality and make no predictions
concerning future foundation performance.
Verification
of existing foundation supports and/or foundation repair work was not a
part of this investigation. Neither
examination nor performance evaluation of any retaining walls located on
this property was included as part of this investigation.
Therefore, we make no statements as to the condition or extent of
such work or the expected future performance of such work.
Mechanically
lifting the foundation may cause some cosmetic damage to the interior
sheetrock and exterior brick veneer that was not present prior to the
foundation repair work being accomplished.
Damage to plumbing systems may occur during the lifting
operation.
Some
exterior and interior cracks are normal for homes located in this area
and will probably occur as a result of seasonal moisture changes in the
soil beneath the foundation. Periodic
repair of this type of cracking is a normal maintenance item and does
not necessarily indicate a structural problem.
A proper maintenance and watering program may help control this
type of seasonal foundation movement.
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