Screed

Screed has three meanings in building construction:
Screed board.
In the United States, screeding is the process a person called a concrete finisher performs by cutting off excess wet concrete to bring the top surface of a slab to the proper grade and smoothness. A power concrete screed has a gasoline motor attached, which helps smooth and vibrate concrete as it is flattened. After the concrete is flattened it is smoothed with a concrete float or power trowel. A concrete floor is sometimes called a solid ground floor.
A plasterer also may use a screed to level a wall or ceiling surface in plasterwork.
This sense of screed has been extended to asphalt paving where a free floating screed is part of a machine that spreads the paving material.
Screed rails.
A "weep screed" or "sill screed" is a screed rail which has drainage holes to allow moisture which penetrated an exterior plaster or stucco coating to drain through the screed.
Liquid and flow screeds.
Flowing screeds are made from inert fillers such as sand, with a binder system based on cement or often calcium sulphate. Flow screeds are often preferred to traditional screeds as they are easier and faster to install and provide a similar finish. Flow screed is often used in combination with underfloor heating installation.
Liquid flow screed is self-levelling. No vibration is necessary to remove bubbles and densify the liquid mass.
Due to the easy consolidation thickness can sometimes be reduced in comparison to conventional screeds. This minimises heat storage leading to a floor that reacts quickly to user requirement hence raising the efficacy of underfloor heating.
Screed coats.
A development in the UK is the delivery, mixing, and pumping of screed from a single vehicle. Where previously screed jobs required a separate pump to administer the screed, these new machines can now administer the screed directly from the mixing pan to the floor at a range of up to 60 meters. For example, the material called granolithic.