The fact is almost all damage to walls, door frames, and ceilings, somewhere in the vicinity of 99 percent, can be boiled down to scuff marks and peeling or scraping of paint. A huge portion of other damage is usually the result of misuse of the product or poor installation. This is why you should carefully review instructions before installing a pull-up bar. If you find issues, contact the manufacturer. Many users tend to find "creative" solutions for getting around problems they encounter, and this can lead to unintentional misuse of the product and damage, and worse.