What is Drummy Render Defect?
Drummy render repair is a type of building defect that is very common with buildings. Drummy render happens when the plaster or cement used in coating a building becomes totally loose or when the plaster or cement render is pulling itself away from the wall. There is also drummy tiling which happens when the tiles and the wall or ground breaks down or when the adhesive glue used in bonding the wall and the floor becomes too weak to bond. This weakness can be caused by water entering the tiles. It could also be due to tiles expanding with age, thereby causing stress on the adhesive for it to fail.
The name was coined from “Drum”, meaning when you tap that particular spot the defect is, it sounds like beating a drum i.e., a weak, empty and hollow sound. Drummy render is also very common with very old buildings; this is due to the wear and tear of the building over a long period of time. The major cause of a drummy render defect is when there is no bond between the bond and the plaster on the wall. In addition, Drummy render defect in a building can be caused by so many things including;
-Water intrusion or ingress: this happens when unwanted water comes into a building; it can be rain, due to roof leakage, drainage problems, floods, etc. And this is one of the major causes of Drummy rendering.
-Cracked Underlying brickwork: this happens when the underlying brickwork of a building is moved or cracked. This causes a hairline crack.
Other possible causes of Drummy Render defects include shrinkage of the plaster, ineffective application of the plaster at the initial stage, heavy vibrations from repeatedly slamming of doors or external causes like seismic activities, construction activities, etc. from external sources, not putting enough cement when mixing, making the cement render too thick or it could even be caused by electricians and plumbers when trying to fix a damage in a building thereby causing a membrane on the building’s wall splitting up the plastic render and the underlying layer.
Easy Signs and Effects of a Drummy Render Defect
Drummy render is not really a major problem when it affects a small area of a building, but it could be a big problem in any building and could cause wall cracking and it might stay for a very long time or get worse within an hour.
How to identify drummy renders
For the best drummy render repair, you need to figure out the causes first. Renders vary in sizes and textures and they include plain, smooth or rough renders. Renders are made to make a building stronger and that is why they are applied on the bricks. Every house has its own type of render, but the most important thing is for the render to be firm and wrap with building or house with its protective skin. Drummy Render defects can be easily spotted in a building. Wall cracking, hairline cracks, painting peel off, etc are major signs of drummy render. If drummy renders are neglected at an early stage if not properly recognized, it might lead to a major flaw in the building. Drummy renders start as a bulge or crack in the wall and produces a drum-like sound when tapped with an object.
When the cement or plaster render is not properly applied on the wall, it is bound to become loose or drummy overtime. If otherwise, the plaster can last for a good number of years. Also, substantial cement or plaster render used on the wall could make the render to become drummy.
Drummy rendering occurs when there is a movement or crack in the underlying surface or simply put when the wall behind the wall surface cracks or moves. It is most visible as a crack or bulging on the wall. It usually starts a small hairline crack on the wall and gets bigger or larger over time when not properly covered up. This drummy render also occurs when the cement mix was either too thick or very light.
Repairing a Drummy Render Defect
Drummy rendering could be fixed by a DIY (Do It Yourself) method to save a few dollars or contacting an expert to fix it. You might be able to fix a drummy render, however, a professional would most likely ensure your drummy render repair is executed perfectly. Nevertheless, you can fix a render with an adhesive glue or bond by sticking the loosen wall back to the bricks. Also, repairing a drummy defect render depends on the size of the defect. If it is a small area, it could be left as it because this won’t cause a serious problem or it could be glued back to the substrate without having to remove the rendering. When the Drummy Render affects a large area, which is usually visible, it is advised to replace the loose plaster by re-plastering the affected area with enough cement plaster depending on the defect. Also, another way of fixing a drummy render defect is by removing or ripping the whole section of the render out, re-rendering the whole section and repainting the affected area.
Steps in re-rendering a drummy render defect
Important tools to have when fixing a drummy wall include; paintbrush, adhesive bong or gum, filling knife, piece of clothing for cleaning and a ladder where necessary.
- Identify the crack or areas where the render is affected or drummy
- Clean up the affected area or use a filing knife to file off the crack without causing another crack opening
- Remove the dirt or brush off the particles from the surface leaving it spotless
- Wet the cleaned area with water using a damp cloth or a sponge
- Apply the adhesive bond to the inner part of the wall using a paintbrush
- Use the filing knife to cover the affected area with the render properly and make sure there is no air pocket.
- Smoothen the render on the surface gently and wipe off any stain.
- Allow the render to dry off.
You could follow these steps or better yet, the best way to fix a drummy render without fear of mistake is to call an expert to fix your drummy render defect.