Deck (building)

Source: Wikipedia, the free encyclopedia.
For other uses, see Deck.
A deck in the backyard of a suburban house
A high level corridor deck in the backyard of a suburban house in Australia
timber
.

In architecture, a deck is a flat surface capable of supporting weight, similar to a floor, but typically constructed outdoors, often elevated from the ground, and usually connected to a building. The term is a generalization from the deck of a ship. A level architectural deck may be intended for use by people, e.g., what in the UK is usually called a decked patio. "Roof deck" refers to the flat layer of construction materials to which the weather impervious layers are attached to a form a roof. It is known as the "roof deck", and they may be either level (for a "flat" rooftop) or sloped.

Functions and materials

Wood or timber decking can be used in a number of ways: as part of garden landscaping, to extend the living area of a

wood-plastic composites" (WPC). WPCs have different brands like NewTechWood, Azek, Ecornboard etc.[1]

Historically, the softwoods used for decking were logged from old growth forests. These include

Atlantic City built the first coastal boardwalk in the United States, originally constructed of the Atlantic white cedar. Soon, the commercial logging of this tree and clearing of cedar swamps in New Jersey caused a decline in the availability of decking. Atlantic City and New York City both switched to Western red cedar. By the 1960s, western red cedar from the US was declining due to over-logging. More expensive western red cedar was available from western Canada (British Columbia
) but by then, pressure-treated pine had become available.

But even with chemical treatments (such as

pressure-treated wood. Pressure-treated wood is long lasting and holds up to wet and icy conditions. Pressure-treating chemicals are known to be toxic.[2] Both softwood and hardwood decks need to be finished after installation using either an oil or varnish to prevent weathering, wear, mould, algae and wood-boring insects.[3]

Due to environmental and durability concerns, composite decking (a mixture of two materials, typically wood pulp and recycled material such as plastic bottles or plastic bags) have appeared on the market. Proponents of

composite decking tout it as a much-needed development, as it helps to curb logging of trees for new decks. However, composite decking contains harmful chemicals, cannot be refurbished, and despite claims from decking companies, some composite decking still attracts mold. However, newer more modern composites feature a cap or shell that prevents mold and staining.[4] In multi-story commercial construction, the dominant form of deck (including roof deck) construction is composite steel deck
.

Generally, hardwoods used for decking come from

tropical forests. Much of the logging of these woods, especially teak, mahogany and ipê, is illegal, as outlined in numerous reports by environmental organizations such as Greenpeace, Friends of the Earth and Rainforest Relief.[5][6][7]
US tropical wood imports are rising, partly due to the demand for decking.

Construction

The deck of a house is generally a wooden platform built above the ground and connected to the main building. It is generally enclosed by a

canopy or pergola to control sunlight. Deck designs can be found in numerous books, do-it-yourself magazines, and websites, and from the USDA.[8]

Typical construction is either of a post and beam architecture, or a cantilever construction. The post-and-beam construction relies on posts anchored to piers in the ground. Typically, these types of structural decks are engineered and require an experienced construction company that specializes in structural decks. Cantilever decks rely on floor joists that protrude out further than the wall of the house. While this type of construction is common, it raises significant safety issues if the decks are not properly waterproofed and flashed. There have been a growing number of deck failures resulting in death and critical injuries. Another key component of decks are code compliant railings. Railings on decks above 760 mm (30 in) are considered

guard rails.[according to whom?
] Guard rails have a specific building code requirement for both height and structural strength. Most U.S. commercial building codes require a 1,100 mm (42 in) guardrail on decks, and 910 or 1,070 mm (36 or 42 in) for a residential code depending on the state. Typical railing assemblies must meet structural strength requirements of 9.6 kPa (200 lbf/sq ft). In short, decks are complex load-bearing structures that most often require structural engineering, plans, and permits.

Residential decks may contain spaces for cooking and seating. Cooking areas ideally should be situated near the patio door while out of the way from general foot traffic. Dining spaces will include patio tables. For a typical six-person outdoor patio table building, an area of 3.7 m × 4.9 m (12 ft × 16 ft) is ideal. If deck space is available, homeowners may choose to include for the seating, outdoor couches and benches.

Larger buildings may also have decks on the upper floors of the building which can be open to the public as

barrier islands
.

Laying deck or throwing deck refers to the act of placing and bolting down cold-formed steel beneath roofing and concrete floors. This is usually done by an ironworker, sometimes in conjunction with a cement mason or carpenter. It regarded as one of the most physically demanding jobs in the iron working industry. In the United Kingdom the various bans on smoking in public buildings were expected to lead to an increase in the use of timber decking for outdoor spaces where smokers can gather.[9]

Urban rooftop decks

Deck on roof of hotel in New York

High-rise commercial and residential buildings with rooftop decks often utilize urban landscaping techniques to create "green spaces" or "sky parks". With this trend in outdoor living increasing, many landscape architecture firms are specialized in the design, construction and maintenance of these spaces. Adjustable hybrid pedestal system allow for a self leveling, single model for all height applications, screw adjustable, and PVC pipe adjustable for elevated roof decks.

See also

References

  1. ^ "How to Choose the Right Lumber for Your Deck?". 5 Nov 2023.
  2. ^ "Lumber Pressure Treated with Chromated Copper Arsenate". New York State Department of Environmental Conservation. 2013.
  3. ^ "Choosing The Best Decking Oil". Blueprint Joinery. Retrieved 2019-02-08.
  4. ^ Paster, Pablo (2009). "Deck: Wood or Plastic?". Treehugger.
  5. ^ Keating, Tim (1997), Teak is Torture: Forced Labor Logging in Burma (PDF), Rainforest Relief, New York
  6. ^ Keating, Tim (1998), Deep Impact: An Estimate of Tropical Rainforest Acres Impacted for a Board Foot of Imported Ipê (PDF), Rainforest Relief, New York
  7. ISBN 978-1-85750-160-5
  8. ^ L.O. Anderson, T.B. Heebink, and A.E. Oviatt. (1972)."Construction guides for exposed wood decks. Agriculture handbook no. 432". Washington: USDA, Forest Service.
  9. ^ "Smoking Ban Good News For Decking", Timber Construction, 2007

External links

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