digplanet beta 1: Athena
Share digplanet:

Agriculture

Applied sciences

Arts

Belief

Business

Chronology

Culture

Education

Environment

Geography

Health

History

Humanities

Language

Law

Life

Mathematics

Nature

People

Politics

Science

Society

Technology

A building envelope is the physical separators between the conditioned and unconditioned environment of a building including the resistance to air, water, heat,[1] light, and noise[2] transfer. The three basic elements of a building envelope are a weather barrier, air barrier, and thermal barrier.[3] The weather barrier may be in a different location than the air and thermal barriers such as in house with an unheated attic. The term building envelope is sometimes used synonymously with building enclosure but the latter term also includes the broader aspects of appearance, structure, safety from fire[4] and security. The act of creating a building envelope is sometimes called weatherization.

Discussion[edit]

The building envelope is all of the elements of the outer shell that maintain a dry, heated, or cooled indoor environment and facilitate its climate control. Building envelope design is a specialized area of architectural and engineering practice that draws from all areas of building science and indoor climate control.[2]

The many functions of the building envelope can be separated into three categories:[5]

  • Support (to resist and transfer mechanical loads)
  • Control (the flow of matter and energy of all types)
  • Finish (to meet human desires on the inside and outside)

The control function is at the core of good performance, and in practice focuses, in order of importance, on rain control, air control, heat control, and vapor control.[5]

Water and water vapor control[edit]

Control of rain is most fundamental, and there are numerous strategies to this end, namely, perfect barriers, drained screens, and mass / storage systems.[6] Damp proofing and

One of the main purposes of a roof is to resist water. Two broad categories of roofs are flat and pitched. Flat roofs actually slope up to 10° or 15° but are built to resist standing water. Pitched roofs are designed to shed water but not resist standing water which can occur during wind-driven rain or ice damming. Typically residential, pitched roofs are covered with an underlayment material beneath the roof covering material as a second line of defense. Domestic roof construction may also be ventilated to help remove moisture from leakage and condensation.

Walls do not get as severe water exposure as roofs but still leak water. Types of wall systems with regard to water penetration are barrier, drainage and surface-sealed walls.[7] Barrier walls are designed to allow water to be absorbed but not penetrate the wall, and include concrete and some masonry walls. Drainage walls allow water that leaks into the wall to drain out such as cavity walls. Drainage walls may also be ventilated to aid drying such as rainscreen and pressure equalization wall systems. Sealed-surface walls do not allow any water penetration at the exterior surface of the siding material. Generally most materials will not remain sealed over the long term and this system is very limited, but ordinary residential construction often treats walls as sealed-surface systems relying on the siding and an underlayment layer sometimes called housewrap.

Moisture can enter basements through the walls or floor. Basement waterproofing and drainage keep the walls dry and a moisture barrier is needed under the floor.

Air control[edit]

Main article: Air barrier

Control of air flow is important to ensure indoor air quality, control energy consumption, avoid condensation (and thus help ensure durability), and to provide comfort. Control of air movement includes flow through the enclosure (the assembly of materials that perform this function is termed the air barrier system) or through components of the building envelope (interstitial) itself, as well as into and out of the interior space, (which can affect building insulation performance greatly). Hence, air control includes the control of windwashing[8] (cold air passing through insulation) and convective loops which are air movements within a wall or ceiling that may result in 10% to 20% of the heat loss alone.[9]

The physical components of the envelope include the foundation, roof, walls, doors, windows, ceiling, and their related barriers and insulation. The dimensions, performance and compatibility of materials, fabrication process and details, connections and interactions are the main factors that determine the effectiveness and durability of the building enclosure system.

Common measures of the effectiveness of a building envelope include physical protection from weather and climate (comfort), indoor air quality (hygiene and public health), durability and energy efficiency. In order to achieve these objectives, all building enclosure systems must include a solid structure, a drainage plane, an air barrier, a thermal barrier, and may include a vapor barrier. Moisture control (e.g. damp proofing) is essential in all climates, but cold climates and hot-humid climates are especially demanding.[10]

Thermal envelope[edit]

The thermal envelope, or heat flow control layer, is part of a building envelope but may be in a different location such as in a ceiling. The difference can be illustrated by understanding that an insulated attic floor is the primary thermal control layer between the inside of the house and the exterior while the entire roof (from the surface of the shingles to the interior paint finish on the ceiling) comprises the building envelope.[11]

Building envelope thermography involves using an infrared camera to view temperature anomalies on the interior and exterior surfaces of the structure. Analysis of infrared images can be useful in identifying moisture issues from water intrusion, or interstitial condensation.[12]

See also[edit]

References[edit]

  1. ^ Cleveland, Cutler J., and Christopher G. Morris. "Building envelope (HVAC)". Dictionary of Energy. Expanded Edition. Burlington: Elsevier, 2009. Print.
  2. ^ a b Syed, Asif. Advanced building technologies for sustainability. Hoboken, N.J.: John Wiley & Sons, Inc., 2012. 115. Print.
  3. ^ Wilson, Jeff. The Greened House Effect: Renovating Your Home with a Deep Energy Retrofit. Chelsea Green Publishing, White River Junction. 2013. 42. print.
  4. ^ Wong, Wah. Building enclosure in Hong Kong. Hong Kong: Hong Kong University Press, 1998. 1. Print.
  5. ^ a b Straube, J.F., Burnett, E.F.P. Building Science for Building Enclosures. Building Science Press, Westford, 2005.
  6. ^ 11. Straube, J.F. and Burnett, E.F.P., "Rain Control and Design Strategies". Journal Of Thermal Insulation and Building Envelopes, July 1999, pp. 41-56.
  7. ^ various authors. Guideline for condition assessment of the building envelope. Reston, Va.: American Society of Civil Engineers, 2000. 4. Print.
  8. ^ Hens, Hugo S. L. C. Performance Based Building Design 2: From Timber-framed Construction to Partition Walls. Berlin: Ernst, William & Son, 2012. 10. Print.
  9. ^ Harrje, D. T, G. S. Dutt and K. J. Gadsby, "Convective Loop Heat Losses in Buildings". Oak Ridge National Laboratory. 1985. Print.
  10. ^ Lstiburek, Joseph W., and John Carmody. Moisture Control Handbook: Principles and Practices for Residential and Small Commercial Buildings. New York: Van Nostrand Reinhold, 1993. 88. Print.
  11. ^ Vliet, Willem. The Encyclopedia of Housing. Thousand Oaks, Calif.: Sage, 1998. 139. Print.
  12. ^ Hunaidi, Osama. Leak Detection Methods for Plastic Water Distribution Pipes. Denver, Colo.: AWWA Research Foundation, 1999. 57. Print.

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Building_envelope — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
247684 videos foundNext > 

Building Envelope

The Building Envelope of the home is the first defense against the elements and the most cost effective way to improve energy efficiency.

Building Envelope Part I

The basic exterior structure of your home is what we refer to as the "building envelope". Every part of that envelope must have the builders attention if he is going make certain that the home...

Building Envelope

Bob Vila discusses a few of the key elements that help our home in the desert beat the heat.

"The Building Envelope" - Episode [9]

Filmed by https://www.sustainabilitytelevision.com/ Episode (9) "The Building Envelope" -- Windows and Doors Michael Bousfield, Mike Battistel, Kristi Choi, Kari Reid, Arthur Lo, Cascadia...

Building Envelope

Part 3: Make Building Envelope

Make Floor Make Walls: Exterior and Interior Add Roof: Use plugin to develop roof and roof details.

Architecture 101 Part 10 The Green building Envelope

Benefits of green and energy-efficient buildings. Presented by Ron Cosentino, Cosentino Architecture, PLLC.

Building Envelope Binder SOPREMA

The new SOPREMA Building Envelope Binder is here ! Find everything in a flash thanks to its user-friendly look and features. Ask your SOPREMA representative to get yours today. Available...

Tremco SkyBEAM Building Envelope Asset Mapping UAV

Tremco Roofing and Building Maintenance has introduced SkyBEAM™ (Building Envelope Asset Mapping) for use throughout Canada. SkyBEAM is a groundbreaking program that uses unmanned ...

Flexhouse: Building Envelope

The Flexhouse in Portland, Oregon was framed in part to reduce the quantity of lumber while maintaining building strength and allowing for high insulation levels. Triple-paned windows were...

247684 videos foundNext > 

7645 news items

 
SteelGuru
Wed, 25 Mar 2015 22:23:24 -0700

Building Envelope Systems, which began in 2011 by two workers from the former MetroWest Steel off Madison Street in Wrentham is looking to relocate to a larger building. They have set their sights on the former Plainville Machine building on High Street.
 
PR Web (press release)
Tue, 03 Mar 2015 22:00:00 -0800

MED-Ed Facilities Boston, the healthcare and educational facilities design and construction event for New England, April 7+8, 2015 at the Seaport Hotel Boston Massachusetts announced key building envelope related workshops Most sessions offer LUs and ...

Enterprise News

Enterprise News
Sun, 29 Mar 2015 06:18:45 -0700

“I also want a structural and building 'envelope' inspection every three to five years,” she said, to ensure the district's buildings are sound. What's immediate now is to learn the truth, she said: “We need an understanding of what caused the failure ...
 
Curbed NY
Sun, 29 Mar 2015 07:42:49 -0700

Earlier this week, the Department of City Planning held an open meeting to begin the process of review of Mayor Bill de Blasio's far-reaching rezoning proposal, "Housing New York: Zoning for Quality and Affordability." More specifically, the meeting ...

New England Real Estate Journal Online

New England Real Estate Journal Online
Fri, 27 Mar 2015 05:33:45 -0700

The waterproofing firm handling inspections should provide a comprehensive checklist, and report on the condition of all aspects of the building structure that comprise the building envelope. Roofs should be routinely inspected in the spring and fall.

ArchDaily

ArchDaily
Sat, 28 Mar 2015 19:03:45 -0700

... well-insulated walls, an air-tight building envelope and solar power reduce the energy demand of the house significantly compared to conventional Swedish construction and the façade materials are rustic and industrial like a piece of old farm ...
 
Innovation Excellence (blog)
Sun, 29 Mar 2015 05:00:00 -0700

The SBEC and SPECIFIC centres in Wales aim to transform the “Building Envelope” into an energy generation, storage and release system. Tata Steel is a major partner in The Proving Factory® based in Rotherham and Coventry, identifying new technologies ...

Richmond Standard

Richmond Standard
Sat, 28 Mar 2015 08:45:00 -0700

The company has expanded to include all exterior building envelope components, including doors, windows and curtain walls, as well as interior finishes and fixtures to satisfy a customer demand for single point sourcing. Exclusively Doors came to ...
Loading

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight