Planning a Wheelchair Ramp

We are excited to share our recently completed wheelchair ramp for a historic building in Washington DC. The building residents wanted a ramp that provides handicap accessibility for their residents. We designed the new ramp at the exterior of the building that slopes from the grade level to the basement level with interior elevators. The residents with a wheelchair now have handicap accessibility to all the levels of the building.
The process and construction required preparation of drawings and approvals from the Historic Preservation Office, Building Department and careful planning with Owners, Contractors and Manufacturers.
If you are planning to build a wheelchair ramp, also known as handicap accessible ramp (in a historic or non-historic building), it would be best to have a check list of design considerations before starting your project.
- Familiarize yourself with the International Building Code (IBC), American Disability Act (ADA) and American National Standards Institute (ANSI) A117.1 that determines rules and regulations for wheelchair ramps.
- Most of the states and local jurisdictions have adopted IBC governed by International Code Council. Always make sure to check with your local permit office for building code and permit requirements.
- Handicap ramp requirement is eight (8) percent slope, that means your ramp should not be steeper than one-unit vertical in twelve-units horizontal. For example, if you are planning a ramp for a height difference of twenty-four inches (2 feet vertical), it will require two-hundred and eighty-eight inches (24 feet horizontal) of floor space. Maximum vertical height allowed in any ramp is thirty (30) inches.
- Minimum ramp clear width is thirty-six (36”) inches, minimum headroom height is eighty (80”) and minimum landing width is sixty (60”) inches.
- The height of railings is between thirty-four (34”) and thirty-eight (38”) inches above walking surface. Handrail material can be wood or metal. We recommend finished wood handrail for interior ramps and corrosion-resistant metal handrail for exterior ramps.
- If the ramp is located at the exterior, plan for storm water drainage and connection to site drainage system.
- Safety comes first, consider slip-resistant finish material for the walking surfaces.




A heightened concern over residential wood deck failures has become prevalent with the recent collapses in the DC – Baltimore area and with the arrival of warm weather.
Before any rope descent system (i.e., window washing boatswain chair) is used on a building, OSHA now requires that each anchor be identified, tested, certified, and maintained so it is capable of supporting at least 5,000 pounds in any direction.
We loaded anchors of many different configurations and found that not all anchors passed this stringent test. If you have any anchors that have not been subjected to this testing in the last 10 years, they must be load tested and certified by a qualified person before they are used. This regulation also seems to apply to new anchors that were installed after the November 20 deadline and not just older anchors.
Amid the 2017 hurricane season, we marvel at the images of the damage these forces of nature can inflict on our buildings and infrastructure. Wind speeds not only define the intensity of a tropical storm but also are one of the primary causes of damage to people and property. Taking a closer look at some of Maryland/Virginia/DC’s windiest hurricanes reveals just how significant Hurricanes Irma and Harvey were.
Dust clouds created while mixing concrete, jackhammering or cutting concrete sidewalks, tuckpointing, and sawing masonry blocks will soon be a thing of the past. The Occupational Safety and Health Administration (OSHA) will begin enforcing new regulations concerning worker’s exposure to silica dust on September 23, 2017. Silica dust is commonly produced when working with concrete, brick mortar, tiles, cement board, and many other common building materials. Long term exposure to silica dust can lead to the development of lung cancer, silicosis, and other permanent conditions with long lasting consequences. Because silica dust is so prevalent, the new regulations will impact many different industries including many facets of construction. Complying with these regulations will potentially impact, property owners, engineers, contractors, and other individuals, in many ways including the cost of construction work.
The Occupational Safety and Health Administration(OSHA) has issued new regulations regarding “Walking and Working Surfaces, and Fall Protection Systems” that have changed the requirements and responsibilities for many building owners. Building owners are impacted if they employ individuals or service providers that utilize rope descent systems that are typically called boatswain chairs and most often used by window washing contractors. OSHA issued the new regulations as part of its efforts to decrease the number of falling deaths and increase worker safety.
A common deterrent to personal enjoyment in multi-family buildings is sound transmission.