Copy a wall is the act of applying a layer of material such a sand & concrete floor (lime can even be used) to a brick or brickwork wall to render it smooth. The wall may then be painted if desired. Rendering your house
Things you’ll need: Wire brush, Plastic or wooden float, Wire scratcher, Steel trowel, Wooden battens, Straightedge, Spray container
Prep is the key: Produce sure your wall to be rendered is very clean and etched so you get maximum keying and suction between render and masonry. Chip away any old render or loose mortar. Brush away any organic and natural growth or materials. If the bricks have a smooth surface consistency, chip away at the front of the voilier to create a key for the render.
Resolve vertical battens to the wall about 10mm heavy, approximately every 900mm, providing them out where necessary to take up undulations in the wall.
Once fixing the first batten to a large part or the wall, make sure it is right and upright even if the wall is not. Each space between these screeding battens will be filled separately. This approach is the easiest way to keep the render flat and even. Before starting, spray the wall lightly to make damp… this will help to achieve good suction.
Render Mix: 1 part cement…. 6 parts clean sharp sand (tip.. try and use plastering sand)
Add the best amount of clean water for the most powerful trowelable combine, too wet and it will slump and too dry and you will not likely be in a position to apply it (it will crumble). Likewise add a waterproofing plasticizer to the mix.. this helps to stop normal water penetrating the finished make and boosts flexibility
Software: Starting at the top, load the hawk and then pick-up the mortar on the trowel. Forcing upwards in a minor arc and keeping a firm pressure, build up the render on the wall between the battens. Level this undercoat off by “see-sawing” the straightedge upwards over the battens. When each bay is filled scratch the surface by using a wire scratcher. Let to be dried before removing the battens and filling with the same mortar mix.
The provide coat can be built of up to two or three layers, first a rough keying damage coat 5-10mm, another body coat of 10-15mm with scratching and a last coat 5-8mm (the fullness can vary depending on point out of the wall.. i. e. a “straight” or “plumb” wall should simply need the two cover system.
In hot conditions outside you may have to control abnormal drying, shrinkage and breaking by keeping the give moist with a sprayer (though not dripping wet)