The brown coat is
applied over the scratch coat to prepare the plaster base for the finish coat application
. The three coats consist of two base coats and one finish coat. The first base coat is called a scratch coat, the second is called a brown coat. In two coat work, there is a single base coat and a finish coat.
What is a brown coat?
Browncoatnoun.
A fan of the TV series Firefly
. Etymology: after a kind of soldier in the TV series that wore brown coats as uniforms.
What is a brown coat finish?
Brown coat: The second rough coat is made of the same mixture and is called the “brown coat.” The brown coat is
applied directly to the scratch coat
, also at a 3/8-inch thickness, but left unscored. The sand provides a rough texture that gives the light, 1/8-inch finish coat a surface to grip onto.
What is brown coat made of?
Today it is mostly
1/2”- 5/8” metal or gypsum base batten
, similar to plasterboard but with a special type of paper to ensure good adhesion. Subsequently, a rough coat based on gypsum and sand “keys” the base and stiffens it for the following coats. It is very rough so that the next hand can get a good bond.
What are the coats of stucco?
Three coat is the original stucco process, consisting of
paper and wire, a scratch coat, a brown coat, and a finish, or “top” coat
. In industry terms — lath, scratch and brown.
How long should brown coat cure?
Cure Time: The brown coat requires a lot more time to cure (
28 days is
recommended). You want the scratch and brown to be fully cured before applying the finish coat to minimize cracking and ensure the greatest possible strength.
What are brown coats called?
Browncoats
were soldiers who fought for the Independent Planets, who lost to the Union of Allied Planets in the Unification War. They were named after the simple, brown leather trench coats they wore as uniforms.
How thick should the brown coat be?
Applying the Brown Coat
The brown coat is the second coat of stucco. It too consists of QUIKWALL® Base Coat Stucco Mix. The brown coat is applied to a thickness of
3/8′′
.
Why is the second coat of stucco called the brown coat?
The “scratch coat” step is so-named because the first layer of stucco is scratched with trowels to provide a key for the second layer. … This step is called “brown coat”
because it is traditionally made with sand and cement
.
How long do you leave a scratch coat?
The first coat is a scratch coat where thats laid on and then scratched to create key for the next coat. Once thats dried usually
about 24-48hours
you can apply the top coat, after laying on its important to use a derby or a straight edge to rule the wall flat.
Is a scratch coat necessary?
Step 3: Scratch Coat
A scratch coat
will be needed when metal lath is used
. This step is not necessary when applying stone veneer to a cleaned concrete, masonry, or stucco surface.
How often should you wet new stucco?
On average, you should wet new stucco
twice a day
to keep it moist for the required minimum of 48 hours after installation. However, depending on weather conditions and where you live, it may be necessary to wet stucco more than twice a day.
How thick should scratch coat be?
The normal thickness is
between 3 and 5 mm.
On soft or weak background use 1:2 or 2:5. Successive coats must be weaker than this coat. The thickness of the first coat depends on the nature of the background and the overall thickness required of the render.
How long does stucco last?
Stucco is a very durable finish material with a typical life span of
50-80 years or more
. Although it is one of the most durable surfaces available, it also features the lowest annual maintenance cost when compared to other siding materials. Stucco is a natural material consisting of an aggregate, a binder, and water.
How long does it take for stucco to cure?
In a traditional three-coat stucco system, the finish coat must be cured using the same practices as base coats. Moist-curing can be terminated after
48 to 72 hours
, but the finish coat should remain uncoated for at least seven days to prevent coating failure or poor bonding.
