Are control joints the same as expansion joints?
In building materials, a control joint is used to control cracking while an expansion joint is designed to handle structural movement. A control joint can be formed during placement of the building material or cut after the material is placed. …
What is an expansion joint in stucco?
An expansion joint is a stucco accessory that accommodates movement beyond plaster shrinkage and curing, and minimal wall expansion and contraction. You cannot span over these with a control joint, a trowel cut in the stucco or any other “we-always-did-it-this-way” means of application.
What is expansion and control joint?
A control joint is a continuous vertical joint filled with mortar, but with a bond breaker on one side so that tensile stress cannot develop across the joint. An expansion joint is a continuous vertical or horizontal joint, left completely free of mortar and filled with elastomeric sealant to keep it watertight.
Does stucco need control joints?
Stucco does not require expansion/contraction joints (also called control joints) when directly applied to concrete, concrete block, or other masonry, except where there is a change from one material to another. Length-to-width ratio of stucco panel cannot exceed 2.5 to 1.
What is a stucco control joint?
A control joint in stucco is intended to relieve stress and limit or control the cracking in the membrane of the stucco only. Usually installed at a maximum of 144 square feet. It is not necessary and in fact can be detrimental to cut the lath behind the control joints.
Do you need control joints in stucco?
Stucco does not require expansion/contraction joints (also called control joints) when directly applied to concrete, concrete block, or other masonry, except where there is a change from one material to another.
Are control joints necessary in stucco?
How often are control joints needed for stucco?
Structa Wire Corp. per ASTM C 1063 – recommends that Control Joints be used to delineate stucco areas not greater than 144 sq. ft., or at maximum distance of 18 feet between Control Joints.
Why does stucco have seams?
One-piece control joints are used in cement plaster assemblies to relieve stress and establish plaster thickness. ASTM C1063 is a standard referenced by building codes to provide guidance on placement, spacing, and attachment of lath and trims.
What is the maximum control joint spacing in stucco cladding?
Control joints are required to take up any shrinkage or movement of the stucco plaster finish. Refer Figure 6. A vertical control joint must be provided at 4 metres maximum centres as required under the NZS 4251.
Are stucco control joints necessary?
What do industries use expansion joints?
Steel expansion joints are important components in many industries and are used extensively in among others: Energy sector (power plants, nuclear power plants, district heating pipe systems etc.) Steel plants Petrochemical industry (oil refineries, pumping stations, oil rigs etc.) Chemical industries (asphalt manufacturers etc.) Process industry (sugar factories etc.) Exhaust systems and engines Pulp and paper industries LNG/LPG tankers, -carriers etc.
Does concrete need expansion joints?
However, concrete does indeed expand when it gets hot or when the moisture content changes. That’s why you need expansion joints in bridges, buildings, and other structures. In exterior concrete, joints widen during cold weather because of cooling contraction and get narrower during hot weather as the concrete expands.
What is brick control joint?
A brick veneer control joint is a continuous gap in the cladding system that al- lows expansion and contraction of the adjacent panels. Although the majority of movement at the joint will occur within 18 months of construction, further movement will continue with changes in façade temperature and cycles of wetting.
What are the types of construction joints?
A few common types of joints used in building construction include the construction joint, control joint, expansion joint, settlement joint, and the seismic joint. Building joints can accommodate movement vertically, horizontally and along the depth of the structure. There are various forces of nature that cause buildings to move.