What Is a Social Security Number (SSN)? A SSN is a nine-digit identifying number is in the format xxx-xx-xxxx. Any individual who is a U.S. Citizen, a permanent resident, or a temporary alien resident who is authorized to work in the United States, must have a SSN.
The most common cause of a flat tire is puncturing of the tire by a sharp object, such as a nail, letting air escape. Depending on the size of the puncture, the tire may deflate slowly or rapidly.
Improper Construction of a Roof Valley. Often, roofing nails are placed too close to the roof valley. Roofing nails should be a minimum of six to ten inches away from the seam of the valley. Otherwise, the nails will draw moisture through the roofing material, causing advanced aging of the roofing material.