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.
Whilst it can be proven that the centre nail fixing of double lap slates is a very efficient method of fixing slates to resist the most severe wind conditions, it is impossible to centre nail the top row of slates. The inappropriate detailing of the top slate fixing is the most common problem found on a slate roof.In previous articles we have looked at the effect wind suction has on the exposed section of the slate and how the top of the slate stops the slate rotating about the nail fixings in the middle.he additional height of the second batten should be equal or slightly greater than the nominal thickness of the top course of slates. . It is common to see a 32x25mm tile batten turned on edge for the second batten, or a standard batten with an additional 6mm lath nailed to it, with a 6mm thick natural slate.