2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54
- Composition of gypsum plaster
- Types of gypsum plaster
- The main advantages of gypsum plaster
- Main technical characteristics
- Application of gypsum plaster
- How to prepare the solution?
- How to plaster a wall with gypsum plaster
Gypsum plaster is usually called a building material, which is widely used in surface finishing. The material is indispensable when performing plastering work in domestic household premises.
Gypsum plaster is an environmentally friendly material based on gypsum, which is a natural component.
The use of gypsum plaster allows you to: create a special microclimate in the room, save heat, reduce noise insulation.
Due to the porous structure of the material, excess moisture is removed in the room, and when the temperature rises, the air is again saturated with moisture. Such properties of plaster allow maintaining a healthy microclimate.
Gypsum plaster has become more in demand today. For surface treatment, it is used more often than sheets of drywall or a mixture of cement and lime.
Composition of gypsum plaster
The basis of the plaster mixture is natural gypsum. Various light fillers and modifying additives are included to improve the various properties. Their inclusion improves the adhesion of the composition, reduces material consumption, and reduces the time for complete drying.
Gypsum plaster is produced in the form of dry mixes, which are packaged in kraft bags. Packaged dry plaster is stored under special conditions. The shelf life does not exceed 6 months from the date of issue. This period may be limited by incorrect storage conditions. The storage room must be dry.
Plaster of paris is best suited for surface finishing in dry interior spaces.
Gypsum plaster can be applied with a sufficiently thick layer, removing almost any irregularities, holes or deep damage.
Types of gypsum plaster
VOLMA-Slay gypsum plaster consists of a gypsum binder, and additives, including mineral and chemical ones, are used as a light filler.
It is an excellent material for leveling ceilings and walls. The use of a plaster mixture allows you to obtain a surface that is already suitable for painting, cladding or wallpapering.
Knauf plaster possesses higher qualities. But it is much more expensive than Volma's plaster.
The main advantages of gypsum plaster
The use of gypsum plaster improves the thermal insulation properties of the room, reducing heating costs.
Walls plastered with gypsum plaster have increased noise insulation, increase the degree of fire protection.
The indoor microclimate is improving in the premises. Walls are able to absorb excess moisture and give it away with a rapid rise in temperature.
Gypsum plaster can hide defects from possible spillage. If neighbors flood you, then after complete drying, as a rule, defects are eliminated by themselves.
Gypsum plaster allows you to create surfaces that do not require further finishing work, such as putty.
The surface is obtained already prepared for final processing. Decorative coatings can be applied to it.
If the plaster is applied to a concrete base, then the surface is pre-primed.
The time for complete drying of a layer of gypsum plaster does not exceed 5 days.
The consumption of gypsum plaster is significantly less than the composition of cement.
Plaster of plaster can be applied up to 60 mm thick without the fear of cracking, flaking or shell-like effects.
Main technical characteristics
unit of measurement
|Operating temperature range||FROM||from + 5 to + 30|
|Finishing layer thickness||minimum||
|Consumption per 1m2 dry mix (layer thickness 10 mm)||Kg||8.0-8.5|
|Volume of solution obtained from 1 bag (weight 30 kg)||liters||38 - 41|
|Time||maturation of plaster||
|life of plaster in an open container||
20 - 25
|drying layer (thickness 10 mm)||45 - 60|
|set of brand strength||day|
|Strength of plaster that has gained brand strength||bend||
|Grain size||mm||up to 1.2|
|Shelf life in a sealed container||month||no more than 6|
Application of gypsum plaster
To apply a plaster layer of their gypsum, certain conditions must be met.
Before applying the plaster, the surface must be cleaned of dirt, old paint, dust, old plaster and primed in several layers.
The works are carried out at a temperature of + 5… 25 ° C and a humidity of no more than 60%.
How to prepare the solution?
Water is poured into a clean container and the dry mixture is poured. 0.5 l requires 1 kg of dry mix. It is easy to calculate that 15 liters of water will be required for a 30 kg bag.
The resulting mixture is well kneaded using a mixer. The mixed solution is kept for 5 minutes and mixed again.
The shelf life of the solution obtained in this way does not exceed half an hour. During this time, you must develop a ready-made solution.
A new solution is prepared in a clean container.
How to plaster a wall with gypsum plaster
The plaster mortar can be applied to surfaces up to 50 mm thick, and in some places up to 80 mm thick. The solution is applied to the walls from the bottom up and leveled with a rule.
To apply the solution to the ceiling, you must first fix the reinforcing mesh.
Excess material can be cut off after 40 minutes.
If necessary, moisten the cleaned and putty surface with water and rub with a sponge float. This is done over the plaster that cannot be pressed with a finger (about 10 … 20 minutes after stripping).
To obtain a high-quality coating indoors, it is necessary to exclude drafts, direct sunlight during the day, and do not apply intensive drying.
At the end of the cycle, the room must be ventilated, excess moisture is removed.
It takes up to 14 days for the plaster layer to dry completely. This makes the surface light and dry.
Remember! A surface with a moisture content of no more than 1% is suitable for painting.
Do not paint the gypsum surface with lime paints.
Of the ready-made mixtures, we recommend using Knauf plaster and domestic Volma or Prospectors.
To prepare a plaster mortar with your own hands, it is best to use plaster of paris, natural or artificial fillers.
Only a professional builder can prepare gypsum plaster on their own.
It is better for novice plasterers to use ready-made dry mixes recommended above.
Below are recipes for making plaster mixes with your own hands.
Composition: for a bag of Econips, Rotband or ABS mixtures, take a bag of sawdust as small as possible and add 3 … 4 bags of building gypsum.
Mix thoroughly in a dry form all the ingredients taken to get a homogeneous mass.
By the way, the resulting mixture can be stored in this form. You just need to pour it into dry plastic bags.
The mixture is used in small portions. A small amount of water is added to it, and the mixture is diluted with a mixer until smooth.
Sawdust acts as a moisture-retaining element. The presence of sawdust allows you to adjust the drying rate of the layer. You can reduce the setting speed of the solution by adding wallpaper glue to it.
Remember! CMC wallpaper glue is not compatible with gypsum.
For one kilogram of gypsum, it is recommended to take three kilograms of chalk. A 5% solution of joiner's glue is added to the resulting mixture.
At the first stage, the chalk is thoroughly crushed, mixed in a dry state with gypsum.
The required amount of the mixture is poured into a clean container and glue is gradually added. You need to get a semi-liquid, lump-free, light gray mass.
Remember! This composition of the putty dries quickly after application.
Glue is added just before using the mixture.
This mixture is recommended to be used for finishing puttying.
Take 2 parts of gypsum 1 part of drying oil and 1/10 part of desiccant NF-1. The desiccant is used to accelerate the drying rate of the composition.
Instead of plaster, the use of chalk is allowed, which allows the mixture to be used for a long time.
To prepare a plaster mortar with a slow drying rate, it is advisable to use a lime-based mixture.
Slow drying of the mortar allows you to apply it in a thin layer.
A solution of 1 kg of gypsum and 3 kg of lime mortar is being prepared.
In a clean container, the gypsum is diluted with water to obtain a gypsum dough and lime mortar is added in small portions. The composition is thoroughly mixed for one minute.
You shouldn't interfere anymore. This reduces the strength of the mortar.
When preparing plaster solutions with your own hands, be sure to use individual safety equipment. Wear respirators, goggles, rubber gloves.
We wish you success!
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