Permanent ramps, as one might think, are more expensive. Ramp Materials: Typically, fixed wheelchair ramps are composed of aluminum, steel, wood, or concrete. The have advantages and disadvantages, although concrete tends to be more expensive than all other ramp materials. Concrete ramps can be stained or painted to match your home's exterior coloration. Semi-permanent ramps are less expensive but they will need to be maintained regularly to ensure their usability. Material choices for semi-permanent ramps include plastic, metal, and wood. Like permanent ramps, maintenance must be done on a regular basis to keep them usable. Temporary ramps can be installed or removed as needed. They are usually made of plastic or wood and are inexpensive. However, temporary ramps are only useful for a limited time before needing to be replaced. There are two main types of wheelchair ramps: straight and angled. Straight ramps are simple to build and easy to maintain. They can be used for most vehicles without modification. Angled ramps are required for vehicles with high ground clearance, such as trucks and SUVs. They provide access up to an angle of 45 degrees from level ground. Ramps should be built so that they can support a person's weight. If not, they may become damaged over time.