The art of creating a scratch plaster is at the right time to incorporate the scratch structure. First of all, it is a brushed plaster that is worked on at the right moment with a nail board or a saw blade. To do this, it must have exactly the right degree of drying. Almost all types of plaster can be converted into scratch plaster.
Mostly as an exterior plaster and highly dependent on conditions
A scratch plaster is mainly used as an exterior plaster. Its rough surface structure supports the regulating effect in the event of the weather. The scratch plaster is sorted into the group of rough plasters. Scratch plasters are also possible indoors. However, they should not be applied to wall surfaces that people can brush past with body parts and areas of skin. Abrasions and grazes are the inevitable consequence.
- Also read - Processing and designing scratch plaster
- Also read - touch up scratch plaster with plaster of the same type
- Also read - Should you paint scratch plaster?
If you do the external plaster yourself and want to apply a scratch coat on the facade, you should plan the time required for the "scratching " in advance. The smooth glazed plaster applied first can only be optimally processed within a narrow time frame. Several people should help with larger, freshly plastered wall surfaces. As a guideline, five to eight square meters of "scratching " per person can be calculated in the appropriate period.
Instructions on how to apply scratch plaster
- Dried rubbing or brushing plaster
- Nail board or
- Saw blade
1. Same conditions
After applying the finishing plaster, make sure that all plastered surfaces dry out evenly. Shade areas exposed to sunlight, for example with wet jute cloths.
2. Check the degree of dryness
After about three hours, find a less visible area and scratch in the desired structure with a nail board or saw blade. If plaster sticks to your nails or sawtooth tips, it's still too early.
3. Regular controll
Test the adhesive behavior of the plaster about every half an hour. In average and normal outdoor conditions (dry weather and temperatures between twelve and twenty degrees Celsius, the optimal condition can take up to six hours.
Run the nail board or saw blade over the plaster in circular movements. Push in the tips about three millimeters. Simply let any coarser "lumps of plaster " fall out.Tips & Tricks Be aware of the different conditions caused by the incidence of sunlight and the direction of the wind. If you are plastering "around the corner", check the degree of dryness on both sides independently of each other.