Historically, beadboard was a millwork product previously constructed by lumber mills. It could be used as a partial or full covering for walls in the kitchen, study, dining room, bedrooms, etc. It could be applied to ceilings, cabinets, and doors, as well. It typically came in a wide variety of styles and thickness. Depending upon the manufacturer, the thickness could range from 3/4" to 5/8" to 1/2" and as thin as 3/8". By definition, beadboard was always edge-matched, which meant each piece was built with a tongue and a groove that fit together to make an integrated surface (much like strip flooring).http://www.oldhousejournal.com/magazine/2006/feb/beadboard.shtml

Although this 17th century design is still available for consumers to use today, there have been some re-imagined designs that are more cost effective and enable a quicker installation. Beadboard paneling is available as a solid sheet of wood that has been tooled with the grooves associated with traditional beadboard. Some companies also substitute traditional wood for other building materials, such as cellular PVC. Today, the applications for contemporary beadboard are widely varied, with beadboard adding a classic flare to everything from hot tubs and decks to flower boxes and garden sheds.http://www.certainteed.com/products/trim/more-info/Beadboard-Trim.aspx

When installing beadboard the consumer needs to keep these few tips in mind to help the work flow easily and give the project a professional look.

1. If possible, start the project in the spring or fall months. Most wood will expand in the moistness of the summer heat and shrink in the dry winter]air.
2. Be sure to acclimate the wood to the area it will be applied. The best moisture content for wood is typically 8% when measured with a moisture meter.
3. Prime the product. By sealing every side of the wood pieces with an oil-based primer, the bead board will be protected from water and help reduce the seasonal alterations mentioned in the first tip.
4. Because some degree of winter wood shrinkage is likely to happen, it is a good idea to paint the tongues the same color as the finished wainscot. This will ensure that the beadboard remains the same solid color in all seasons.
5. Painting along the joints rather than across them, will avoid cracks in the paint that bridges the gaps between the joints when the wood shrinks or expands.http://www.thisoldhouse.com/toh/article/0,,1610836,00.html