FiberBeam Technology-Pound for Pound Stronger Than Steel-No Delamination!

All of our fiberglass shelters and buildings come standard with our exclusive FiberBeam Technology. This innovative and proprietary composite lamination process bonds inner and outer fiberglass skins with a series of integrated fiberglass I-beams. The process incorporates fiberglass I-beams spaced every 12” on center throughout the walls, doors, and roof, resulting in a fiberglass composite construction process that is both lightweight and super strong (pound for pound stronger than steel!).

Foam is a great insulator but not a good structural material. That is why we developed FiberBeam™ Technology. When a typical FRP panel with foam core is placed under a load the bond between the foam and the FRP is put under stress and can fail. With FiberBeams, the same panel is more rigid and can withstand much higher stresses without any bowing or buckling.

In addition to our exclusive FiberBeam Technology, walls can be customized to accommodate increased structural stability, hanging equipment, additional insulation needs or sound attenuation

Need something structurally sound enough to survive earthquakes or hurricane-force winds? FiberBeam Technology handles the majority of environmental issues for most applications, but if you have a special need, just let us know!

The Walls of Our Fiberglass Buildings

Standard Wall Composition

  • Resin
  • Polycor/Stypol Polyester Resin
  • Fiberglass
  • Core Materials
  • Rigid Polyiso foam board: non-ozone depleting
  • Isophthalic Gel Coats

Other environmental issues & structural stability factors to consider

  • Snow loads
  • Hurricane-force wind loads (up to 160 mph!)
  • Corrosive environments
  • Seismic events (zone)

Why Put Wood In Your Wall

Wall Reinforcements

If you need to hang equipment on the walls inside your shelter, we can put lumber inside the walls. At Shelter Works, we offer three different options:

  1. We typically use Oriented Strand Board (OSB) Plywood for minimum warping. OSB is known for its rigidity, strength, uniformity and durability. It is particularly suited for weight bearing applications since it has a greater load-bearing capacity than milled wood panels.  OSB has no internal gaps or voids and is water resistant, making it a perfect material for adding needed strength to walls that will have heavy equipment mounted on them.
  2. Some clients prefer ¾” marine grade plywood to withstand moisture. Some of our customers choose to go with Marine Grade Plywood over OSB in high humidity areas where the walls will be pierced or penetrated in the field to add additional equipment not installed during production. Others prefer to have Marine Grade plywood in the base flanges where the shelter will be secured.
  3. We can also offer Thermo-Lite Board®.  This is a manufactured, ultra-heavyweight woven fiberglass that offers all the strength of wood without being a wood.  Thermo-Lite is used in very specific situations where chemicals used in the fiberglass building can cause wood to ignite.

Since all the wood used in the construction of our prefabricated shelters is encapsulated within fiberglass, we typically recommend OSB over Marine Grade to avoid unnecessary costs. However, the final choice of wood used is always up to the client.


Foam: Every Shelter Works building includes a foam core, using standard ridgid polyiso panel . This foam has been tested for volatile organic compounds (VOC) and formaldehyde emission to ensure it is below the maximum levels allowed and received the Greenguard Environmental Institute highest rating of 4, which means it is highly resistant to mold growth.

Shelter Works buildings are very energy efficient, with tight joints and high-quality building composite structure. This chart shows the R-Values of the foam alone; the actual R-Value of the shelter could be much higher, depending on the number of openings, vents, fans, etc.

Foam ThicknessFoam R-Value
1 1/2″12
2 1/2″
3 1/2″24

Gel Coats

To hold up to tough industrial applications, Shelter Works uses Isophthalic UV protecting gel coats that maintain a nice gloss over long periods of time and in many weather situations. These high quality coatings provide a quality finish, with good chemical/water resistance, gloss retention, weatherability, and resiliency, which means that they can resist damage from impact, chemicals, water and even grafitti! These gel coats, used in combination with our unique FiberBeam construction process makes a building that truly is “Built for Life.”

Gel Coat Colors

  • Standard Colors: Polar White, Desert Sand, Storm Grey and Meadow Green
  • Custom Color Match available for any color
  • Shelter Works uses a high quality coating that yields a quality finish, with good chemical/water resistance, gloss retention, weatherability, and resiliency.
  • Formulated to meet the rigid requirements of transportation, boating, and sanitary applications

Standard Colors

Faux Brick Pattern

Fiberglass: Every shelter we build is constructed of high-quality fiberglass. We use a variety of resin types, depending on the application; the most commonly used is what is known as Stypol LSP Unsaturated Polyester Resin.

TestTest MethodLaminate: 33% Glass
Tensile StrengthASTM D63816,000 psi
Tensile ModulusASTM D6381,300,000 psi
Tensile ElongationASTM D6381.9%
Flexural StrengthASTM D79033,700 psi
Flexural ModulusASTM D7901,160,000 psi
Barcol HardnessASTM D258345

Sound Attenuation

The standard composite construction of a Shelter Works building includes a foam core that provides some sound attenuation, with a minimum STC rating of 25 decibels. If you need additional sound attenuation, we can add optional sound absorbing materials to blunt the noise of machinery even further

One  client did his own testing and sent us his results. What you see in this chart is that the noise level inside the structure where the machinery was measured 93 decibels, but standing outside from 5 feet away, the decibel readings dropped off dramatically to 66 decibels.

Just How Durable Are Our Shelters? Watch These!

We took a baseball bat and a golf club to our buildings to see how they would hold up–check these out!

Want to See How Our Shelters Are Assembled? Watch This!