The building codes for modular homes are strict. They fall under the same rules as any type of construction as far as the type of materials used and how they are appraised.

Building standards for modular homes

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In the United States, all modular homes are constructed according to regulations enforced by organizations like the International Residential Code (IRC) or a number of similar entities that manage local jurisdictions.

IRC is a valuable tool for new owners as it ensures that their home will be built to high standards. The organization reviews the codes in place to determine whether modular homes meet regulations.

This post explains it more in-depth:

The International Residential Code (IRC) is a comprehensive, stand-alone residential code that creates minimum regulations for one- and two-family dwellings of three stories or less. It brings together all building, plumbing, mechanical, fuel gas, energy and electrical provisions for one- and two-family residences. The IRC also provides a prescriptive approach (i.e., a set of measures) and a performance approach (i.e., energy modeling) for determining compliance.

What is IRC?

IRC building standards for modular homes may differ from standard houses. That is because these standards are directed towards the prefabricated home industry. All building standards need to be met for the structure to be given clearance.

Being built in a controlled environment affords multiple benefits.

  1. No weather delays
  2. No setbacks waiting on subcontractors
  3. Less wasted materials
  4. Materials aren’t exposed to the elements until finished
  5. Quality control is more stringent
  6. Prefab components speed up construction resulting in lower labor costs

Here is a good explanation of why factory-built homes are a good option:

The building standards for modular homes are highly regulated, and the roofing system is no different.  By having them built in a controlled environment, there is less that can go wrong.

The typical roof is a 3:12 pitch so they can clear height obstacles in transport such as overpasses. However, with the innovation of tilt-up roofs, there are additional options with a roof that is hinged to allow for tilting to the desired peak.

This post explains more about this process:

Unlike conventional site built construction, roof trusses are usually not used in the building of a modular home. In site construction, roof trusses are built separately, and are installed via Modular Hinged Roofa crane at the jobsite after the framing is complete. Instead, the roof and ceiling systems in a modular home are built into the actual structure of the home. Engineered with a fold up self supporting rafter system, the modular roof system might be one of the more complicated stages of the modular home construction process.

For easy installation, roofs are usually built adjacent to the floor and wall stations. Roofs and ceilings begin with the laying out of the drywall and the construction of framing. The 2”x6” or 2”x8” wood members used in the construction are spaced 16” on center. If prescribed by the engineered drawings, a Microlamb beam may be installed in areas of large spans to accommodate heavy weight loads.

Drywall is then adhered to the ceiling framing with a special foam seal spray application.  According to the style of home you are building, 12″ – 16″ front and rear overhangs are then installed. The roof and ceiling structure is then lifted and carried via crane and is set fastened and strapped to the perimeter top plate of the unit as well as lagged into its interior walls.


If you choose to go with a traditional hand-framed home or need roof maintenance or repairs, you can hire a Denver roofing team for your next project. They will keep the project on track and provide updates on the progress.