CA License# 636220 
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Seismic Joints

    Certified Applicator for:

  • Balco, Inc.

  • Watson Bowman Acme Corporation

  • Construction Specialties, Inc.

Sun Control Devices

Seismic Expansion Joint Systems have become and integral part in design for the Building Industry.  They allow for independent movement of buildings during seismic events with minimal damage, and provide a safe passage for people.  Separations in Buildings may be small as 2" and as large as 48".  We (Sonoma Fabricators, Inc.) provides and installs all types of Seismic Joint Covers, in various types of structures, which consists of:

  • Floor

  • Interior Wall

  • Exterior Wall

  • Ceiling

  • Fire Rated Systems

Specifications section 05800 is generally assigned for the specific requirements for each project, although they could be included in various specification sections.


Sun Control Devices

Specialize in Sun Control Systems for a variety of needs from daylight management to solar heat reduction.

Louvers / Vision Screens

Specialize in aluminum extruded / acoustical louvers and extruded vision screens for all performance and aesthetic needs.

Small Bridges

For the last 80-100 years steel and aluminum corrugated pipes have been used for drainage, enclosures, underpasses, and in many other instances all over the world. They have gained wide acceptance due to their strength, resistance to breakage, immune to damage by fire, corrosion resistance, etc. These structures are made up of pre-formed corrugated panels that are assembled in place or on flat road-ways to be set into place. Of either steel or aluminum, these structures come in various types depending on what they are being used for. The process for constructing these structures can depend on the type, size, and place of installation. Steel and aluminum structures have been a successful replacement for the labor-intensive reinforced concrete structures.

Types of structures (referring to shape) are:

  •  Pipe, Pipe-Arch
  •  Ellipse
  •  Underpass
  •  High and Low Profile Arch
  •  Arch
  •  Box Culvert
  •  Super-Span.

Almost all of these shapes are either steel or aluminum except for a Super-Span structure which is usually steel. All these types are used for different circumstances, where size and strength of the structures are important.

Aluminum structures, since they are not as strong as steel, require additional support to carry the maximum load and to provide added stiffness to the overall structure. So ribs are added every 9, 18, 27,or 54 inches for reinforcement.  Majority of the time the corrugated panels are offset to produce maximum seam strength.

The Pipes, Pipe-Arches, and Underpasses always have a bottom where as the Arches, Box-Culverts, and Super-Spans do not. Arches are either low or high profile depending on the total height of the structure and a rise-to-span ratio is typically .30 to .50. There are numerous sizes for all structures ranging from small to very large.

The materials used to erect these small bridge replacements come from the manufacture ready for assembly. The corrugated steel or aluminum panels are different sizes depending on the size of the structure. These panels are bolted together using inch galvanized bolts and nuts. As stated before with aluminum structures, ribs are used for stability and strength. On large structures movement control hooks are used to measure the movement of the structure during the back-fill. Anchor bolts are used on Super-Span structures for concrete thrust beams located at the maximum points of stress. These steel bars with bolts attached are bolted to the outside of the structure at or near the quarter points. Anchor bolts of another sort are bolted around the perimeter of the end of the structure. These bolts serve as the tie to the concrete headwalls.

The process for constructing a steel or aluminum structure varies slightly. A structure can either be pre-assembled and set into place or built into place. Bolting the plates together are done in almost the same manner, but with aluminum structures the seams contain two bolts per corrugation where-as the steel plates only have one. This is due to the obvious reason that steel is stronger than aluminum. Lapping plates can have an effect on the whole structures strength so the laps must be done in accordance with the plans and specs.  On all structures the plates are offset to produce maximum seam strength. Bolts are torqued to +/- 150 foot pounds.

The erection site depending on the engineer is done in accordance of what type of structure is being built. If the structure is one without a bottom, concrete footings are formed for the side corrugated panels to seat and usually bolt into. Full pipes lay on a bed of whatever the engineer has determined. Bedding preparation is critical to both structure performance and service life. The bed should be constructed to uniform line and grade to avoid distortions that may create undesirable stresses in the structure and/or rapid deterioration of the roadway. The bed should be free of rock formations, protruding stones, frozen lumps, roots, and other foreign matter that may cause unequal settlement. It is recommended that the bedding be a stable, well graded granular material.

Satisfactory backfill material, proper placement, and compaction are key factors in obtaining maximum strength and stability. Backfill must have the same requirements of the bedding but must meet AASHTO M145 for soil classifications A-1, A-2, or A-3. Backfill must be placed symmetrically on each side of the structure in six to eight inch loose lifts. Each lift is to be compacted to a minimum of 90 percent density per AASHTO T99. During backfill, only small tracked vehicles (D-4 or smaller) should be near the structure as fill progresses above the crown and to finish grade. A minimum cover may need to be increased during construction to handle the heavier machinery. A poor backfill can cause a collapse of the structure underneath.

Erecting these small and large structures has been a family business for a number of years. The business was started in 1973 and has been in the family for the past 29 years (3rd Generation operated).  We travel to places near and far to build these small bridge replacements. We build a lot in Oregon, Washington, Nevada, and California (northern and southern). Most of all of the structures built in the 70's are still in place and performing as if they were just newly built.

Sonoma Fabricators, Inc. Sales and Assembles these Small Bridges. (New and Replacements)


Wine Caves

Wine Cave

These photos are of a small winery in Nevada County. These Wine Caves are much more practical than mining caves due to the high cost of the mining permits as well as the construction. Contact us for more information.


Fossil Filters

Fossil FiltersDue to Federal and State environmental laws, local agencies (cities, counties and states) are required to apply for storm water pen-nits. These agencies must demonstrate that they have a Storm water Pollution Prevention Plan (SWPPP) incorporating the Best Available Technology (BAT), as outlined by the federal EPA standards, to deal with Pollution caused by urban runoff.

KriStar Enterprises, Inc. has developed a product line that offers the most effective and economical way of removing contaminants from storm drainage systems. This product, "Fossil Filter™" , can easily be installed in any size or shape, new or existing drainage inlet. As storm water enters the inlet, it passes through replaceable filter material that captures petroleum-based hydrocarbons. In addition, the Fossil Filter™ does not inhibit water flow during high flows when drain capacity is critical.

Maintenance is done once a year under an agreement setup through Sonoma Fabricators, Inc.  Purchases of Fossil Filters™ can be made through Sonoma Fabricators, Inc.  For more technical and/or specific information on Fossil Filters™, visit KriStar Enterprises, Inc.

Sonoma Fabricators, Inc.
1101 Plumber Way, Suite 101
Roseville, CA 95678
(C) 2010 Sonoma Fabricators, Inc.                                                                                                                                                                                                             Design by Red Dog Records