roof trusses of various types were used in
industrial and commercial buildings constructed
from the 1920's through the middle 1950's. SPS Inc.
has been involved in the repair and reinforcement
of these trusses since it's inception in
The Primary Causes of
- Overload from
excessive layers of built-up roofing, or the addition of
loads induced by adding roof mounted mechanical
equipment, suspended ceilings or other items not included
in the original design.
- Defects in
material or workmanship, which result in failure under
long term loading conditions. The lower chords of
bowstring trusses (the most common type of truss), are
subject to tension failures caused by failures in knots,
poor slope of grain, or improperly drilled holes in
- Impact from
forklifts. This often occurs in warehouse operations
where the lower chords are damaged due to the driver's
impaired visibility or carelessness.
- Exposure to
such elements as extreme heat, moisture, or toxic
chemicals. Damage to trusses in heat-treating or
anodizing plants are very common. Poor ventilation in
these types of facilities is a primary cause of failures
in wood roof trusses.
original design of some trusses will result in failures.
For example, the Summer bell trusses, which utilized a
wider upper chord lamination as a ledger for the roof
rafters, will have inadequate end distance of the bolts
in the tension web members. The bolts will eventually
shear out through the end of these tension webs. This
condition is especially prevalent in conditions where
ceilings are attached to the lower chords.
For The Repair &
Reinforcement of Wood Roof Trusses:
physical inspection including photographs of existing
conditions, explanation as to cause of the failure, and a
written report of recommendation for the specific repairs
temporary shoring of roof trusses to provide a safe
condition for the occupants, as well as to minimize the
potential for the damage to increase. This service is
available on a 24-hour basis.
- SPS will
provide complete engineering services with plans and
specifications for the required truss repairs. Our
experienced staff has developed proven systems and
techniques for specific conditions over many years. We
are pleased to have our designs reviewed by owners and
As a licensed general
contractor, SPS Inc. provides complete construction services
related to roof truss repairs. Our organization is geared to
provide prompt, efficient service to our clients. Our
experienced professional field personnel are fully trained
and equipped with specialized tools and equipment to provide
the highest level of skill and craftsmanship required in
this specialized type of repair.
© SPS Inc. All Rights Reserved