A plastering scrim is a layer of heavy fabric that is affixed to the wall in order to help keep plaster from shifting, cracking, or peeling. It’s commonly referred as a “top coat”. The main function of the scrim is to take weight off of areas on the wall where there are imperfections and cracks which can cause the plaster to delaminate. Scrims can be applied directly over old finishes, in some cases with an undercoat for additional protection. However, when working in an older home, it’s often preferable to remove the old finish before attaching a scrim. This is done by installing a layer of joint compound over the entire surface. The screed is then applied over the joint compound.
The term “scrim” originates from early stage theatre where they were used to cover sets between skits. In theatre practices it is called “floating scenery”. Scrims are still used today in theatre and plays, but more commonly now in creating high quality stage props for plays.
A “scrim” is also a piece of fabric hung over an actor’s face to create a shadow effect. In the theatre it is typically called “lighting scrim”. In this context it is usually specifically referred to as a “face scrim” because they’re attached to the lighting units themselves.
A “scrim” (also spelled “scrim”) is an important piece of stagecraft. It can be used to distort the light with extreme visual effects and to create a three-dimensional “stage setting” for a play. Scrims are normally hung from above from a single vertical supporting column or wire and work by spreading the light from the projector through the scrim and projecting it onto the performers in some fashion. The term is derived from a word meaning “to spread out”, i.e. “to spread out or extend”.
A scrim is commonly used in stage lighting, where it is sometimes used with a clear acrylic panel to conceal the light source and disguise the beam path. A scrim can also be used in photography to block out unwanted light sources. In film or television production, scrims are often used to create a “screen” effect between the actors and their surroundings, where props and set pieces are not in use but through which the actors move.
Scrims are also used for professional audio recording. Scrims are often used on the outside of a vocal recording booth to absorb hard reverb and leakage, which is why they are also often referred to as “reverb blankets”, “acoustic blankets”, or simply “acoustic screens”. Scrims can also be used inside a vocal booth in conjunction with foam or fiberglass wedges to absorb hard reflections and create a more diffuse reverberant sound.
Scrims are a crucial element in theatre and film lighting. They are used to control the beam of light from a spotlight, whether on one half of the beam only, or full scrim in front of the whole beam. They are used to distort and change the color of a spotlight’s beam, or even make it appear to be another type of light altogether. Scrims can also reflect light back at a subject for fill purposes, or simply to provide a more pleasing soft balance to an image.