Required variable properties
All mortars consist of the same basic ingredients sand, water and binders. Additives create or enhance different properties. These include density, elasticity, adhesion, appearance and stabilization. When processing cement plaster is usually worked on vertical surfaces. In addition to the permanent hold, the appropriate additives also ensure immediate support during and during application.
When plastering with cement mortar, pot life is also important. The drying time of the mixed plaster must bring sufficient viscosity for the work. This property is also influenced by additives, without adversely affecting the subsequent correct setting and curing.
Adapting processing to circumstances
Masonry can consist of many different materials. In addition to the usual concrete bricks with clay or ceramic or natural stones are possible. When applying cement mortar, this factor must be taken into account. Porous concrete types offer better grip than smooth ground surfaces. If necessary, the layers must be applied at more frequent and thinner intervals.
At work, the environmental conditions determine the success or failure. If, for example, unsupervised direct solar radiation acts on the fresh plaster, the water contained evaporates too quickly and the cement mortar does not hold. In rain and high humidity, the holding and Abbindefähigkeit is adversely affected and can lead to substantial irregularities.
How to apply exterior cement plaster
Cement plaster (adjusted to substrate)
- Cement plaster (adjusted to concealed plaster)
- Clean, cool water
- Mixing bowl with mixing rod or
- Mixing machine
- Respiratory and eye protection
- 1. Substrate
Clean the masonry to the extent that is referred to in rooms as Besenrein. Unevenness caused by swollen joint mortar will knock you off and straighten it. You do not have to do this with millimeter accuracy. Ä 2. External conditions
If you can not exclude sunshine and precipitation during your work and the first days after plastering, shade or protect the plaster surfaces with tarpaulins or foils. Anm 3. Mixing
Mix the cement plaster according to the manufacturer's instructions. Note the amount you can process in the pot life. If you are using finished plaster, only fill the appropriate amount into your mixing vessel and seal the rest airtight. Unter 4. Flush-mounting
Apply the concealed plaster according to the manufacturer's instructions with the trowel or "throw" it against the wall. Ober 5. Top coat
After setting the concealed plaster, mix the top coat and install according to the manufacturer's instructions.
Tips & TricksWhen plastering, take care of your health. Cement should not be inhaled when dry, which can happen quickly due to its dusty consistency. When wet, cement plaster develops alkaline properties that can lead to burns. Avoid any direct skin contact with protective clothing.