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.[citation needed]

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 remained 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 and convective loops.[citation needed]

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.[citation needed]

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.[citation needed]

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.[citation needed]

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 internal condensation.[citation needed]

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. ^ 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.

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.
306738 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

Building Envelope

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

Architecture 101 Part 10 The Green building Envelope

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

Energy Efficiency with RETScreen 4 - Part 2: Building Envelope

This is the second part of a series of 14 tutorial on Energy Efficiency with RETScreen 4. This video covers the Energy Model Worksheet, user defined fuels an...

EnergyPlus Building Envelope Overview

Overview of the basic object types required to describe the building envelope and internal gains. (EnergyPlus v6.0.0) For more information about EnergyPlus v...

Terracon: Building Envelope

Our assessment services assist owners in evaluating the integrity of an existing roof or building envelope through comprehensive surveys that determine signs...

Building Envelope Approach

The Gaia Project's introductory video to heating calculations from a building envelope point of view. It includes the explanation of the two main formulas pr...

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 le...

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 ...

306738 videos foundNext > 

680 news items

NET Website

NET Website
Wed, 30 Jul 2014 04:37:30 -0700

So if something happened, a big storm and it knocked out the electricity for the area, a building that has really good insulation and isn't leaking is going to maintain its habitability a lot longer than one that doesn't have a good building envelope ...

DigitalJournal.com

DigitalJournal.com
Tue, 08 Jul 2014 18:36:09 -0700

BEACHWOOD, Ohio, July 8, 2014 /CNW/ - Tremco Roofing and Building Maintenance proudly introduces SkyBEAM (Building Envelope Asset Mapping) for use throughout Canada. SkyBEAM™ is a groundbreaking program that uses unmanned aerial ...

Athens NEWS

Athens NEWS
Sun, 27 Jul 2014 17:49:00 -0700

Stabilization of the long-unoccupied building's envelope and future planning of what could be in the Armory building are all part of the study proposed by the Armory Ad Hoc Committee at the City Council meeting. Council had already received a proposal ...
 
Daily Union
Tue, 29 Jul 2014 07:26:15 -0700

The projects and associated cost estimates include: mechanical and controls upgrades at the middle school, at a cost of $1,350,409; building envelope improvements at the middle school, $24,905; roof replacement at West Elementary School, $599,163; hot ...
 
Times Colonist
Wed, 30 Jul 2014 03:14:15 -0700

The strata corporation will have control over those items on the exterior that affect the building envelope and interconnected components. The strata corporation will control the scope of work performed by a contractor, including insurance and site ...
 
Canadian Architect
Mon, 28 Jul 2014 14:00:41 -0700

In addition to a high-performance building envelope, the hospital includes 125 boreholes, each 250 feet deep, to provide zero-carbon energy for heating and cooling the building through radiant slabs. A 19-kilowatt photovoltaic array, the largest of its ...
 
Progressive Rail Roading
Wed, 30 Jul 2014 07:15:00 -0700

Built in 1872, the station will receive a new roof, a new building envelope, and new lighting and finishes. In addition, doors and windows will be replaced, automatic doors will be installed and other other accessibility improvements for people with ...

AZoBuild

AZoBuild
Wed, 30 Jul 2014 03:07:30 -0700

Skybox Houston One offers users abundant available power, a robust building envelope, and an extremely secure site situated well above the Houston 500-year flood zone. The facility is designed to a LEED Silver standard and the FM I-150 roof system with ...
Loading

Oops, we seem to be having trouble contacting Twitter

Talk About Building envelope

You can talk about Building envelope with people all over the world in our discussions.

Support Wikipedia

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