A joint in a long run of cladding, gutter or flashing designed to allow for thermal expansion and contraction.

A joint that allows for building material expansion and contraction caused by temperature changes.

A weather-tight joint across the width of the building allowing for expansion and contraction.

A device that allows a structure to expand or contract without breakage.

A junction that allows for expansion and contraction.

a device used to connect long lines of pipe to allow the pipe joints to expand or contract as the temperature rises or falls.

A joint in which movement for expansion and contraction is allowed.

Joint or space to allow for movement due to temperature or seismic changes and/or material conditions.

A device used to make up the motion of expansion and contraction. On large roofs this provision for the movement of the materials forming the walls, roof deck and roof covering is usually made by deliberately separating the building into sections, and covering separation between adjacent sections with the expansion joint to allow movement but keep out the weather. Expansion joints, unlike control joints, penetrate through the roof deck.

A space left between two surfaces that allows for natural expansion and contraction, typically filled with a flexible backer rod covered with caulk.

A type of building joint where a significant distance is left between two substrates so as to accommodate normal building expansion and contraction due primarily to temperature changes. A sealant placed in this type of joint is subject to being stretched and compressed, rather than being sheared. (See " Lap Joint")

Bituminous fiber placed between seperate slabs of concrete, as on a sidewalk, to prevent cracks when rising temperature causes expansion.

a device used to allow movements in a duct system

a joint that goes through the entire structure and a control joint extends from the roof deck up through the roof system

an unsightly piece of fiberboard or other compressive material that separates the concrete slabs and allows for expansion and contraction of the slabs

a section with interlocking steel teeth that lets the concrete deck move as a result of temperature variations, but major problems occur when joints jam frequently, and scientists expect significant savings by using ECC

Non-corrosive material used to separate two structures and allow for movement.

Generally refers to a telescoping two or three-piece accessory designed to allow structural building movement at specific locations in the envelope. Also see Control Joint.

A small space separated sections of track to allow expansion or contraction because of temperature changes.

A joint that allows wood to contract and expand during seasonal temperature fluctuations.

A material placed within or a scoring of concrete that allows it to expand without cracking.

Flexible material between two surfaces that enables joints to ride out differing rates of expansion and contraction.

A device used to permit a structure to expand or contract without breakage. In residential construction, a bituminous fiber strip used to separate blocks or units of concrete to prevent cracking due to expansion as a result of temperature changes. Also used on concrete slabs.

A planned, controlled joint placed between two roof surfaces or between two sections of a built-up roof. The expansion joint allows the roof to expand without physical damage to the roof or the building. French (Joint de dilatation)

The vertical space made in a concrete structure or between it and an existing structure to allow the concrete to expand and contract with temperature changes without damage to the surface. Home Improvement Encyclopedia

When used within the context of this web site, expansion joint refers to a metal bellows expansion joint designed to absorb axial, lateral and angular motions in piping systems.

Bituminous fiber strip used to divide sections of concrete streetwalk or blocks to prevent cracking due to expansion.

A special rail joint in which each rail is cut back and overlapped in such a way that considerable longitudinal movement between the two rails is possible.

A break or space in construction to allow for thermal expansion and contraction of the materials used in the structure.

Device that permits a structure to expand/contract without breakage.

A joint through tile, mortar, and reinforcing wire down to the substrate.

For bridges and other structures, it is a joint between two parts of a structure that allows for expansion of both parts due to temperature changes. For utilities, such as pipelines, it is a flexible connector that allows for movement during an earthquake without breaking. pp. 81, 92

A planned break in a continuous field of tile that has been placed to absorb pressure when the setting surface expands and contracts; prevents buckling or crumbling.

A meeting point between two parts of a structure which is designed to allow for movement of the parts due to thermal or moisture factors while protecting the parts from damage. Commonly visible on a bridge deck as a hinged or movable connection.

The space built into a structure between two surfaces or structual elements to allow materials to expand and contract during temperature changes without damage.

A device designed to allow movement caused by expansion and contraction.

A built-in separation between building sections to allow for free movement between the sections without damaging the buildings structural components.

a connection of two members which allows for movement of the members when affected by pressure toward or away from the connecting joint--allows for expansion and contraction; usually found in concrete work, stucco, etc.

Fibrous material (@1/2" thick) installed in and around a concrete slab to permit it to move up and down (seasonally) along the non-moving foundation wall

a structural separation between building elements that allows movement without damaging the structure

A control joint in the concrete designed to allow for concrete movement.

A separation between adjoining parts of a masonry structure which is provided to allow small relative movements such as those caused by thermal changes, to occur without one part affecting an adjacent part.

A break in a surface to allow the material to contract and expand without causing damage. It may be a working joint to allow movement or a control joint to isolate a stress.

A joint in a structure that allows both lengthening and shortening of adjacent parts.

A planned, controlled joint placed between two roof surfaces or between two sections of a built-up roof. Expansion joints allow roofs to expand without causing harm to building.

A joint designed to provide means for expansion and contraction movements produced by temperature changes, load, or other forces.

A bituminous fiber strip used to separate blocks or units of concrete to allow free movement and prevent cracking due to expansion from temperature changes.

A joint that permits expansion without doing damage to the structure.

A joint through tile, mortar, concrete or masonry down to the substrate, intended to allow for gross movement due to thermal stress or material shrinkage.

a structural separation between two building elements that allows free movement between the elements without damage to the roofing or waterproofing system.

a structural separation between two building elements designed to minimize the effect of the stresses and movements of a building's components and to prevent these stresses from splitting or ridging the roof membrane.

1. Strips of rubber or flexible material used to separate units of concrete. Because the strips are compressed, they give the concrete room to expand with temperature changes, thus preventing cracking. 2. A flexible piece of metal used between gypsum wallboard panels to prevent buckling when temperature changes cause the panels to expand.

An expansion joint is an assembly designed to safely absorb the heat-induced expansion and contraction of various construction materials. They are commonly found between sections of sidewalks, bridges, railway tracks, piping systems, and other structures.