Welcome to Domtec International:

Thin Shell Monolithic Concrete Domes


Silver Leaf Heat Island Effect: A Solar Reflectance of .726 and a Thermal Emissivity of .89 on our waterproof white DomeSkin™ air form decreases the heat island effect. Custom colors are also available.

Green Leaf Economical: One of the least expensive free-span roofs to build, most FEMA domes are designed to 124', 138', 160' or 180' in diameter, but architectural domes can span 200'+ without interior columns or expensive steel beams.

Gold Leaf Energy Efficiency: With a minimum 3" of polyurethane insulation (R-20), an air tight roof and the thermal mass of the concrete an owner can save 30%+ on monthly energy utility bills over the same square footage of a conventional building.

Orange Leaf Domtec's pre-engineered waterproof, insulated, thin shell, reinforced concrete domes are designed for hurricane and tornado winds of 200+ mph (and are literally bullet-proof). The useful life of the dome is 50+ years.

Red Leaf Heat Island Effect: A Solar Reflectance of .726 and a Thermal Emissivity of .89 on our waterproof white DomeSkin™ air form decreases the heat island effect. Custom colors are also available.


Hurricane/Tornado Safe Room Dome

Domtec builds to Federal Emergency Management Agency 's (FEMA) P-361 Community Safe Room guidelines which meet or exceed the International Code Council (ICC) 500 guidelines for safe shelters and the Texas Department of Public Safety (DPS) Texas Safe Shelter Initiative (TSSI).

Thin shell domes designed to the prescriptive FEMA requirements meet the "near absolute life safety protection" of a building during an extreme wind event such as a hurricane or tornado.

According to FEMA, "Near-absolute protection means that, based on our current knowledge of tornadoes and hurricanes, the occupants of a safe room built in accordance with FEMA guidance will have a very high probability of being protected from injury or death."

Since domes rarely act as a community storm shelter in relation to the time it can be used for other purposes, our commercial monolithic dome plans provide a free-span interior that can be built out into a variety of applications such as gymnasiums, cafeterias, libraries, churches and sanctuaries, conference centers and emergency response headquarters.


Why Build with DOMTEC International?

  • 20 years and every project completed on-time
  • Engineering: proven structural engineering; robust construction
  • Safe: Zero structural failures
  • Fiscally Responsible: Conservative financial structure
  • Quality Control: stringent ISO-patterned QA/QC plan
  • Economics: We can Value Engineer your project to save you money
  • Workmanship: Technicians average 20+ years' experience
  • Warranty: DomeSkin™ air forms with standard 15-year warranty


Insulated Reinforced Concrete Domes, sometimes referred to as "concrete shells", "thin shell concrete domes" or "monolithic domes" are known for their rapid construction (usually a matter of a few weeks depending on the size), economics for a cost-effective free-span structure, energy efficiency from thick insulation and thermal mass of the interior concrete and near absolute protection from both manmade and natural disasters.


Inflate Image

Domtec fabricates their 15-year limited warranty, waterproof DomeSkin™ air forms into the custom shape specified in the project manual using a tensile fabric similar to a commercial roofing membrane. On many commercial monolithic concrete dome projects, a stem wall is constructed using concrete masonry units (CMUs), bricks, concrete or Insulated Concrete Forms (ICFs); then the air form is attached to the top of the stem wall and inflated. The positive air pressure keeps the fabric membrane up as polyurethane foam is applied.


The nominal 3" (R 6.6/in ≈R-20) insulation also acts as an air barrier keeping the heat out in the summer and the cold out in the winter. The foam provides initial rigidity to the structure and adds a sturdy base to hang a non-structural layer of rebar or 'premat'.

Isolating the concrete protects the structure from deterioration through freeze/thaw cycles and dampens exterior noises. The concrete acts as a thermal mass and helps avoid wild temperature fluctuations you find in conventional buildings.

Insulate Image


Rebar Image

The foam provides initial rigidity to the structure and adds a sturdy base to hang a non-structural layer of reinforcing bar (rebar). We call this non-structural layer a 'premat'. The premat acts as a cage to place rebar hangers from which will be used to tie the structural mats of rebar in place. The premat also helps the initial layer of shotcrete to stay in place.


Finally, shotcrete is sprayed to the structural rebar in thin layers by our expert shotcrete technicians who have been spraying shotcrete in domes for over 20 years. The shotcrete is sprayed over the premat to a specified depth, and then structural mats of rebar are placed and embedded in the shotcrete in intermittent layers until depth gauges are completely covered.

Shotcrete Image


DOMTEC International Statistics

Once completed, commercial monolithic concrete domes have excellent acoustics for arenas, gymnasiums, churches and theaters. Architects and other designers can specify dropped acoustical clouds or ceilings to focus, reflect or dampen the sound as needed. If you are looking for an architect and/or structural engineer to get started on your project who is familiar with thin shell concrete domes and finite element analysis (FEA), give us a call and we will refer some architects or engineers to you.

Dome building is an art form more than a science; meaning that because of slight variations in the air form, foam, rebar and shotcrete placement, it takes an experienced and well-trained team to understand the construction process. Domtec analyzes each project to ascertain the proper method of construction and conducts a risk assessment to make sure domes that will be occupied by the public are well within the engineer's safety factors.

Having been in business 20 years, we are always on the lookout to value engineer the buildings and save tax payers and investors' money. Not all commercial monolithic dome plans are designed and engineered the same. Some architects, engineers or owners insist on using expensive post-tension ring beams and extremely "flat" domes. In some cases, we have found casting the ring beam in place vs a post-tension ring beam and increasing the height of the dome a few feet can significantly reduce material and construction costs while not affecting the FEMA-361 guidelines or compromising the structural integrity of the dome. These savings can then be deducted from the total cost of the building or put into other architectural finishes.

After 20 years we've completed every project on-time, have never been sued by a client and never had a structural failure. It is a #1 record we intend to keep. Call or email to get a quote or find out more information about Domtec International, a world-class thin shell concrete dome builder.

4355 N. Haroldson Dr.
Idaho Falls, ID 83401

+1.208.522.5520 | T
+1.208.522.5344 | F