The 5 most common fixings mistakes

8. October 2020

DIY (do it yourself) is on trend. Crafting your own decorations, revamping the garden with a homemade lounger or making stylish industrial-style lamps is becoming increasingly popular. But be careful when it comes to safety-relevant fixings. We list the most common application mistakes and how to avoid them.

Mistake no. 1:  Not drilling deep enough

The shelf has been assembled and now needs to be fixed to the wall. The user first measures the exact drilling location before marking it. When drilling, it is particularly important not to drill into any wiring. But there are other things to be aware of: If you don’t drill deep enough, the screw can get stuck and break off when being screwed in further. This should be avoided at all costs. Our rule of thumb is therefore that the drill hole should be as big as the anchor. Think about how deep the screw will sit in the drill hole. Select a screw that is longer than the anchor and thicker than the attachment part. If the screw is significantly too long then the drill hole must also be able to accommodate the screw. Did you know? The plastic plugs were named according to their diameter: An 8 plug requires a drill hole of 8 mm. The right screw will then be a bit smaller than the diameter of the plug. You can also find further information on the product packaging.

Mistake no. 2:  Using the wrong drilling method

A common mistake often occurs during drilling when the drill hole has been marked and the next step is ready to be taken. But which tool is the right one for the job? This often leads to issues, according to our Application Engineer Andreas Cardinal. “If an impact drill is used instead of a hammer drill, for instance, then this causes problems”. The anchor can’t be placed deep enough, especially when using cartridge systems with large dimensions. Impact drills may be seen as universal tools, but a hammer drill should nevertheless be used for hard concrete, for instance. On the other hand, hammer drills should not be used under any circumstance in other construction materials such as vertical coring brick, as this would drastically reduce its load-bearing capacity.

Mistake no. 3:  Using a plug that is too short

Those renting a property won’t always know the composition of the walls. Those who still want to set an anchor in a wall would be best off carrying out a test drilling first. This allows the construction material to easily be determined through the drilling dust. It is important to know that an anchor should always be placed in a load-bearing surface. A common error is placing an anchor in plaster or in non-load-bearing layers, which can happen if the selected anchor is too short, for example. It’s best to first determine the required anchor length to safely install it in the load-bearing base.

Mistake no. 4:  Incorrect use of a chemical anchor

Tradespeople have been familiar with injection systems for some time. But this fixings solution is also popular among DIYers, as it allows higher loads to be attached. Those who don’t use the entire cartridge might remove the mixer and simply replace the cap. This causes the channel for the curing agent to close up so that only the resin is squeezed out during the next application. This prevents the product from curing, meaning it cannot be used for anchoring purposes even after a long wait. The cartridges can be kept for a relatively long period of time if they are stored in a dark location that isn’t too warm. Cellars are an ideal storage place. Our advice: The relatively short processing time can be increased in summer by storing the cartridge in a cool place.

Mistake no. 5:  Using a worn drill

Let’s say a mirror needs to be installed in a concrete wall as soon as possible. The drill may look a bit worn, but a new one isn’t available. Be careful in this case: Using a heavily worn drill will lead to issues when placing anchor bolts in concrete or when hitting reinforcements. This can lead to the anchor not sitting deep enough and protruding.

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