For small gaps and spaces, a plugging chisel can work better than a cold chisel as the blade is not as wide and can be more easily controlled. Raking out the joints to this depth should remove all the old exposed and weathered mortar, whilst leaving a good solid base to work with. If you do not have access to an angle grinder or the dust will be too much of a problem then using a mortar rake or a cold chisel and lump hammer are your next options. When I use a grinder I always use a dust mask, safety goggles, and ear defenders, and if I can I use a face shield to stop any rogue pieces of masonry from hitting my face. If you remove less than 15mm of old mortar, any new mortar will not have enough surface to bond fully and will fall out in a matter of months and you will need to redo the job again.

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You can even use an old flat-bladed screwdriver to rake out old mortar but these are not as good or as fast as using a hardened chisel which is made for the job.

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These fit on to most angle grinders and do the same job as a cutting disc however they are much smaller in diameter, typically they are available in 6mm or 8mm dia. Woodworking chisels can be used for a variety of purposes, including the production of fine furniture. However, care should be taken as there are multiple subtypes of woodworking chisel available and it is important to select the right type for your requirements. Heller HSS-G Super Twist Drill DIN 340 Extra Long – Heller 21399 8, These 9mm HSS-G super twist drills from Heller are extra long so can Read More » Remember to always follow the manufacturer’s instructions and wear the appropriate protective clothing. Once the horizontal mortar is raked out using the angle grinder and cutting disc, I swap over to a 40mm x 8mm diameter mortar rake cutter.

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I often use a cold chisel and a lump hammer to remove stubborn old mortar that the other methods cannot cut away. Next, proceed to run the chisel following the wood grain. The scored area should be chipped away until the wood inside the outline has been extracted to the required level. Care should be taken to strike away from the body and only extract a small amount of wood with each strike.The Hammer and chisel is the most accurate method to cut out the old mortar and can be used in space that an angle grinder will not fit like internal corners or tight gaps. It is important to choose the type of chisel best suited to the work that you will be carrying out. Additional factors such as the chisel size and blade shape should also be taken into consideration. To make a small indentation when working with wood, the chisel should be positioned at a 90-degree angle. A wooden mallet can then be used to strike the chisel and carve out the desired amount of wood. The chisel should be held with the bevelled edge closest to the wood. When using an angle grinder to cut the old mortar use the disc guard as your guide to the correct depth or use a depth gauge attachment so that you keep the depth level on all the joints.