Repairing Old Bricks
To re-point damaged joints, first rake out the old mortar and then insert a new mix. This is normally made up of one part cement, one part hydrated powder lime and six parts soft sand. The lime makes the mix far more workable, but you can substitute it with a few drops of a proprietary liquid plasticizer. When you make the mix stronger by growing the proportion of cement, the mortar is liable to shrink and crack as it dries. It’ll also impede the drying of the wall when wet.Brick Repair near me is an excellent resource for this.
If you are only re-pointing a couple of bricks, then it is possible to acquire bags of mortar mix to which you simply add water. Tip out the entire content and mix it thoroughly together, then put back into the bag what you don’t want. The ingredients tend to separate and it you only tip out what you will need you can avoid using too much or too little cement.
If some bricks are spoiling then the rest are possibly porous and will need protection. The easiest technique would be to apply a water-repellent seal with a paintbrush or roller.
Old age and frost damage can trigger brickwork to turn porous, eventually permitting damp to pass through to the inside of the home. One answer is to patch up broken or spoiled bricks with mortar, colour-matched to the surrounding ones. This is, however, difficult to do well. And if you have any cracks or gaps between the patching mortar and also the brick, water can be sucked in by capillary action, causing further troubles.
Where frost has damaged the surface of a brick, drill a series of holes into it to a depth of about 100mm (4in) with a power drill and masonry bit.
Chop out the honeycombed brick and surrounding mortar with a cold chisel and a hammer, and clean up the recess.
Use ready-mixed bricklaying mortar, worked to a stiff consistency, to the top of the brick below and on the sides and frog (the V-shaped indentation) of the new brick. Push it firmly into place. Use a chisel to chop out the brick and surrounding mortar.
Tap the brick in flush with its neighbors, press much more mortar in round it and neaten off the points to match the wall’s style of pointing.