You can put new asphalt over old asphalt, but it's not recommended. The main reason you don't want to put new asphalt over old asphalt is because the two layers will not bond well together, which could lead to problems down the road. For example, the new asphalt could start to peel or chip away from the old layer. If you do choose to put new asphalt over old asphalt, make sure that the surface of the old asphalt is as clean and smooth as possible. You can do this by using a degreaser and a power washer. Also, make sure that the temperature is above 50 degrees Fahrenheit and there is no rain in forecasted for 24 hours after installation.

Yes. It is possible to put new asphalt over old asphalt as long as the underlying surface is in good condition and free of debris. The new layer of asphalt will adhere better to a clean surface, so it's important to remove any loose material or vegetation before paving.