Do you need control joints in stucco?

While this measurement (and other spacing restrictions from ASTM C1063, Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-based Plaster) are a requirement for stucco on lath, control joints (CJs) are not generally needed in direct-applied except for where …

Are expansion joints the same as control joints?

In building materials, a control joint is used to control cracking while an expansion joint is designed to handle structural movement.

Where should stucco control joints be placed?

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.

What are control joints in stucco?

First, let’s look at some definitions: A control joint is a single prefabricated stucco accessory, applied to the surface of—or incorporated within—the metal lath to allow for the shrinkage of the stucco cladding typically associated with the curing or hydration process.

How do you stop a stucco from cracking?

Solution: To lower the risk of drying shrinkage cracking, the following measures should be implemented:

1. thoroughly wet highly absorbent/rough-textured masonry before applying stucco;
2. follow the recommended mix ratios, avoiding cement rich mixes;
3. damp-cure newly applied stucco in hot and dry weather conditions;

Does stucco adhere to concrete?

Stucco can be applied to a concrete or masonry surface with or without a reinforcing metal base (lath). The bond and/or thickness of the cement plaster will determine the need for a lath. However, the WRB (building paper and house wraps) prevents the bond between the plaster (stuc- co) and the concrete.

Does all concrete need expansion joints?

Expansion joints are virtually never needed with interior slabs, because the concrete doesn’t expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.

What is the purpose of expansion joint?

Expansion Joints are a bellows type device. Expansion joints are used to absorb thermal expansion. They can also be used to absorb contraction in cryogenic lines and to reduce vibration in piping systems. Materials of construction for the bellows can be stainless steel or rubber or even a composite material.

Can you stucco over expansion joints?

So the short answer is yes, you can stucco over expansion joints, but there is more risk of cracking. We’ll talk about if stucco expands and contracts, what the difference is between expansion and control joints, if you lath over expansion joints, and if you can stucco without lath at all.

Why does stucco have seams?

Stucco control joints are used to help aid in preventing cracking in the stucco overtime. Stucco joints can also separate different textures, colors, or materials.

Should I worry about hairline cracks in stucco?

So, if you’ve seen cracks in your stucco, when should you repair them? The answer simply is, as soon as possible. Even if you’ve seen a small crack appear, you should attend to it right away. It may only be small now, but before long it could spread and cause more issues down the line.

When should I worry about cracks in stucco?

If the cracks are larger than an 1/8 of an inch or continuously occur, you may want to have it repaired before further cracking or water intrusion/rotting develops.

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.

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