You know what nails are, or you think you do but probably not. There are lots of different nail designs, each intended for a different use. Nails used for framing are different that those used to install flooring, and masonry (concrete) nails … and you get the idea.
Nails sizes get more interesting because the length is defined by the word “penny” from when nails in England were name for how much 100 nails of a given size cost. There's some logic with two penny or 2d (d for denarious, a Latin name for a penny) nails that are 1″ long, going up by quarter inch increments. The scale changes though after 10d so when you're going to the store for nails, make sure you know how long they need to be, and how you're going to use them.
Lowe's has a nice visual chart to show you how different nails are.
National Association of Realtors (NAR) – A trade organization that sets the standards for the real estate profession and enforces a rigid code of honesty in real estate dealings. Membership includes real estate professionals across the country.
Negative amortization – The situation in which the balance of a loan gets larger, rather than smaller each month because payments made are too small to cover the loan’s interest charges. For example, if your monthly payment amount is based on a 4% interest rate but the actual rate being charged on the loan is 7.5%, your payments will not cover the accrued interest and each month the unpaid interest portion will be added to your loan balance.
Negative side waterproofing – An application wherein the waterproofing system and the source of hydrostatic pressure are on opposite sides of the structural element.
Neoprene – A synthetic rubber (polychloroprene) used in liquid- or sheet-applied elastomeric roofing membranes or flashing.
Nesting – A method of reroofing with new asphalt shingles over old shingles in which the top edge of the new shingle is butted against the bottom edge of the existing shingle tab.
Newel – The post supporting the handrail at the top and bottom of a stairway.
No Cut-Out Shingles – Shingles consisting of a single solid tab with no cutouts.
Noncombustible – The material will not burn.
Non-Recourse Loan – When a mortgage or home equity line of credit is a non-recourse loan, the bank can only foreclose on your house.
Normal Slope Application – Method of installing asphalt shingles on roof slopes between 4 inches and 21 inches per foot.
NRCA – National Roofing Contractors Association is one of the construction industry's most respected trade associations and the voice and leading authority in the roofing industry for information, education, technology and advocacy.