“Floating” is a function which uses a number of different sized trowles depending on what area you are plastering. Below are a few areas the where floating is utilized.
Floating plastered walls
Smoothing plastered internal wall with a plastic float – Floats are used during the plastering process to make sure that every part of the wall is as flat and smooth as possible – known as floating.
Floating plastered ceilings
Floating ceiling with metal float – A float is often used to make sure a ceiling is as flat as possible. If plastering a whole room, do the ceiling before the walls in case of any drips.
Ceiling plaster should be thinner than on the walls – about 2mm for the first coat, and 1.5mm for the second. A damp sponge float will help stop the plaster drying out too quickly, which tends to be the biggest problem with ceilings.
Floating repaired crack on exterior wall – The plaster on external walls is called render, also known as stucco. Render may be floated in order to:
>Flatten the surface
>Blend in patches that have been repaired
Floating concrete with magnesium float – Magnesium floats are designed to smooth over and flatten newly laid concrete surfaces. For more information see: How to float concrete.
Finishing pointed walls
Floating cement mortar pointing – Sponge floats can be used to achieve a good finish on outside walls that have been freshly pointed (where gaps between bricks or stones have been filled with mortar).
You can use them to add mortar to any remaining crevices, smooth over ridges and remove excess material.
Keying plastered walls
Wooden devil float -You can use a use a wooden float with screws or nails driven into it, called a devil float, to key the wall before applying the final coat.
Keying involves making shallow scratches all over the wall to create a good gripping surface for the top layer of plaster. For more information see How to key a wall with a float