DeMuth Steel Products, Inc.

Hemispherical Dome Roofs


Hemispherical Domes have been called 'the kings of all roofs,' and they now cover some of the world's most important buildings. Domes are curved structures that have no angles or corners and enclose an enormous amount of space without using any supporting columns. Design Domes are weather-resistant, not watertight. For watertight applications, an underlying roof must be included in the design. The possibilities for design and creativity are endless with this type of roof. Whether it is to be used on a private home or commercial building, it becomes a focal point of the structure.

Our hemispherical dome roofs are lightweight, yet self-supporting due to the design. With no interior support, they can actually become a part of the totally open interior space - so let your imagination run wild! If a hemispherical roof doesn't fit your needs, we can manufacture a roof according to your specs. No other style of roof creates such a feeling of spaciousness. These domes add an unsurpassed air of sophistication and richness. For a unique combination of quality, function and design, merged with elegance and style, include a domed roof in your next building project.

We manufacture strong, durable roofs for all circular structures with diameters of 10' to a maximum of 36'. Customers can select from a variety of colors and finishes, as well as acrylic Galvalume, known as Galvalume Plus®.

Examples of our dome roof installations can be found on: Residential, Commercial, Municipal, Playgrounds, Community Centers, Communication Towers, Recreation, Sports Complexes and Churches.

Technical Information on DeMuth and Lancaster Domes

The steel domes are shipped in stacks of pie-shaped steel sections, ready for assembly on the job-site. Panels are radiused and their edges are roll-formed into channels at the factory. These are then nested together and bolted together during assembly resulting in a rigid and beautiful free-standing structure. They can be used as an architectural detail or can become an integral part of the building structure, providing a breathtaking inside view.

Domes are available with a base diameter from 10' to 36'. They can be produced as perfect hemispheres or can be formed into more exotic shapes.

The domes are typically manufactured from 24 gauge premier galvanized steel which can be prefinished with a wide range of colors.

Installation of these domes is quick and surprisingly economical.


  • Galvalume Plus - 24 gauge acrylic coated Galvalume
  • Custom Colors - offered in 24 gauge galvanized or Galvalume material coated with Kynar 25-Year finishes
  • Copper - 20 ounce Architectural Grade Copper, 3/4 hard


  • Standard: Commercial zinc plated Stainless Steel


  • Dome Roof is shipped knocked-down, base attachment angle or brackets
  • Available for various mounting requirements
  • Panels assembled with wide rib overlapping narrow rib
  • Panels held together with a clip/bolt/neoprene washer assembly
  • Weather sealing package available

Shipping: The dome roofs are packaged and crated for shipping via commercial carrier

Frequently Asked Questions About Dome Roofs

  • What diameters are available?
    Any diameter from 10'0' to 36'0'.
  • Can a special size dome be manufactured?
    Yes. In most cases, we can manufacture to your exact diameter and center height requirements.
  • What materials are used?
    Domes are made from 24-gauge material and supplied with a GalvalumeTM 'Plus' finish or a veariety of quality painted finishes applied over a substrate of G-40 galvaneal. We can customize any color or finish to the needs of the customer.
  • Can I paint the dome myself?
    Yes. The dome can be purchased with a 'Washcoat' over galvanized. The washcoat is a paint primer. With a simple wipe down the sheet is ready for paint.
  • Can I assemble the dome myself?
    Yes. With our detailed assembly instructions manual, anyone with a basic knowledge of construction can assemble a dome.
  • What makes your product special?
    The DeMuth Hemispherical Dome is 'self-supporting'; it does not require any superstructure for erection. It is a 'free-standing' product.
  • How do you attach your dome to a structure?
    There are a variety of anchoring and/or attachment systems available to meet the numerous design applications for this product. After a review of your plans, we will recommend a system that best meets your application.
  • Is any special re-inforcing needed with your roof?
    Depending on the diameter, the geographic and physical location, Re-inforcing Kits are available. These kits are designed to 'hug' the inside wall of the dome and can be applied without detracting from the 'effect' of the dome.
  • Is the dome weatherproof?
    Domes are weather-resistant, not watertight. For watertight applications, a weather sealing kit is recommended. An underlying roof presence for inclusion with the design.
  • Can the dome be insulated?
    Yes. There are several ways to apply insulation. After reviewing your plans, we will recommend a particular application.
  • Can the underside of the dome be plaster finished?
    Yes. DeMuth offers an additional steel frame attachment assembly that sheet rock and/or plaster can be attached.
  • Where are your domes made?
    Depending on your application and location, the dome will be manufactured in either Waterloo, Ontario or Mount Joy, Pennsylvania. Both facilities have competent professionals to help in the application and manufacture of a dome roof to meet your needs.
  • What about Wind and Snow load?
    DeMuth has available testing data for wind load and snow load (based on a computer model and tested to a national standard.) We also have certified wind load testing for our large hemispheric domes. Because each municipality has it's own 'Code' that needs to be met, and the variety of ways our prodcut is applied, we recommend contacting a local Civil Engineer to spec the dome to your application.

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