DeMuth, Steel Products
Open Site Navigation


Here our most frequently asked questions.

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 its own "Code" that needs to be met, and the variety of ways our product is applied, we recommend contacting a local Civil Engineer to spec the dome to your application.

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.

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.

Can the dome be insulated?

Yes. There are several ways to apply insulation. After reviewing your plans, we will recommend a particular application.

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.

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.

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.

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.

Can I assemble the dome myself?

Yes. With our detailed assembly instructions manual, anyone with a basic knowledge of construction can assemble a dome.

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.

What materials are used?

Domes are made from 24-gauge material and supplied with a GalvalumeTM "Plus" finish or a variety of Kynar 500 finished applied over a substrate of Galvalume or G90 galvanized. We can customize any color or finish to the needs of the customer.

Can a special size dome be manufactured?

Yes. In most cases, we can manufacture to your exact diameter and center height requirements.

What diameters are available?

Any diameter from 10'0" to 36'0".

Architectural Domes

How do I know what to order?

Simply measure the total height from the ground to the step-off point and DeMuth will ship all the components required to comply with safety regulations along with complete assembly drawings.

What materials are used?

Box Beam Uprights are manufactured from G90, 16 ga., galvanized inset channel. Rungs are galvanized 1" dia. welded tubing with a knurled surface.

What safety standards are met?

DeMuth ladder and cage systems meet applicable OSHA and ANSI standards.

Industrial Ladders and Safety Cages

What type of lug should I order?

Demuth will supply lugs and nuts to match the rod strength and the field application.

What strength rods are available?

DeMuth offers standard 9/16" diameter tensioning rods at 40,000 PSI minimum yield strength with 20% elongation in 8". We can supply other diameters.

What is the thread length?

The length ranges from 4" to 6".

What coatings are available?

Zinc electro-galvanizing with either a clear chromate (silver) or gold chromate conversion coating. Other types of coatings are available upon request.

What lengths and diameters are available?

Lengths are available from 10' to 20'. Diameters are available from 1/2" to 1".

Tensioning Rods and Lugs



​© 2021 DeMuth Steel Products Inc - All rights reserved