New buildings are constructed using thermalite blocks, making it more difficult to simply attach TV wall brackets to the walls. Thermalite blocks are used in constructions that do not require heavy cement blocks but still prefer using blocks instead of wood. The closed air cell structure provides good thermal insulation making it cooler in summer and warmer in winter, resulting in less energy used and less insulation materials. It can also withstand fires of high temperatures. A thermalite block is very light and can be held in one hand. Once plastered on the wall, it is hard to differentiate it from a concrete block. However, it is noticeable when drilling into the wall. The material is so soft any drill bit can make a hole through it. Drilling a hole in an exact position is hard as the drill can wander off tangent due to the softness. This will affect screwing the TV brackets onto the wall. You should drill very slowly and carefully to ensure the holes are straight. You can attach the wall brackets using universal plugs with two-inch screws on the concrete. Universal plugs do not need hammer action when drilling the hole.
When drilling the holes, start with a small hole, and enlarge the holes slowly until the plugs fit exactly in the hole. If your TV wall bracket is fitted with a tilting facility, or mounts flat on the wall, and your TV is less than thirty kilograms, you can drill the holes on the wall, insert the plugs and screw it tightly. Be careful when tightening the screws as too much pressure could make the thermolite blocks loosen along the sides of the screws within the block. The TV wall bracket can sustain the weight of the TV but the thermolite block might eventually loosen and give way to the weight of the TV wall bracket and television. This becomes more risky when attaching a cantilever motion TV bracket where you can swing the TV out from off the wall. The leverage and movement of the TV can be absorbed by the wall brackets but the themolite wall could give in on the added strain.
You can use special thermolite fixings to ensure the TV brackets are firmly secured to the wall. It is done by inserting special epoxy glue into the drill hole before the screw, and the glue penetrates the block to form a strong fixing. As you enter the screw into the hole, the epoxy helps bond the screws to the cement, making for a firmer grip. You will notice that as the screws enter the hole, the excess epoxy will form around the external surroundings of the hole providing additional support to the plate. Some people recommend applying epoxy glue, regardless of the material, to ensure the screws and metal plate of the TV bracket are firmly secured in place. It minimizes the danger of the TV bracket being torn out of the wall. Use the epoxy glue that is appropriate to the material it is being applied on. It may cost slightly more and there may be more time and effort spent applying the glue but you minimize the risk of having the TV and wall bracket falling off the wall.