Concrete screws are a versatile choice of anchor suitable for a whole range of building services installations. Walraven’s ETA approved concrete screw anchors can be used in both cracked and non-cracked concrete, solid brick, hollow brick, stone and fire rated installations. We created top tips for installing concrete screws because unfortunately anchor failure due to incorrect installation is a real risk.
Unfortunately, incorrect installation of anchors has historically lead to catastrophic anchor failures, resulting in serious injury and destruction of structures, along with costly re-work. Therefore it is extremely important that the installation process documented in the ETA is followed without exception.
As humans we can sometimes be averse to following instructions, our experience can make us feel like we know better! But in this case it poses a significant risk and should be discouraged to ensure our installations are safe.
1. Anchors always require a drilled hole. Even though concrete screws have a thread, for safe installation they should always be screwed into a drilled hole.
2. Do not anchor into a bad hole. The drill hole should be created according to the specifications in the ETA. For example, it must be: 
3. Always clean the hole. This is the most common step to be skipped, but it is important to ensure the drill hole is cleaned of dust debris before inserting the screw anchor. If drill dust remains, you risk being unable to insert the anchor fully into the hole and subsequently causing it to break.
4. Use tools with an appropriate amount of torque and do not overtighten the screws. The ETA will give you specific torque values to guarantee the performance of the screw anchor. If you overtighten the screw or use a tool which is too powerful, you risk breaking the concrete screw.
5. Always take time to plan the installation. Take time to read the ETA installation instructions and brief your team to ensure the concrete bolts or anchors are installed safely and according to the guidelines.
Walraven offers a range of high performance ETA approved concrete screw anchors. Alongside our high quality anchors we provide onsite support such as anchor pull tests as well as technical advice to help you with your anchor selection.
Read our ‘Guide to Selecting & Installing Concrete Screws’ to find out more about concrete screws, ETAs and read a testimonial about Walraven’s anchors.
Our Concrete Screw ETA documents can be found in our document library. They contain full detailed installation instructions for our concrete screws.
If you have a technical question about how to install concrete screws, contact our Technical Team at [email protected]
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