Deformation controlled ceiling anchors are typically used for fixing fixtures to ceilings such as electrical clips, suspended ceilings and partition deflection heads. Deflection heads often have a build up of soft materials such as timber and Gypsum.
Historically, there have been different variations of ceiling anchors. Some using steel and others using alloy. Alloy anchors that had a central drive pin have become defunct as they offer limited fire protection.
Alloy anchors then evolved and became made up of two parts, the head/shank and a drive pin. Once the anchor is installed into the pre drilled hole, the drive pin is hammered in causing expansion and friction to secure the anchor in place. Many ceiling anchors have European Technical Assessment (ETA) for cracked and uncracked concrete, ensuring that when installed correctly they will serve 50 years life. Being zinc plated, they are used for fry internal use only. Some ceiling anchors will include a fire rating within their ETA where fire protection is critical.
Several mistakes are observed when contractors are installing these products. To ensure the correct installation of a ceiling anchor keep the following two points in mind:
- Tapping the fixing into the pre drilled hole with the drive pin, rather than the head of the body. This will cause the fixing to start expanding before the head of the fixing is flush with the fixture.
- The assumption that the drive pin needs to be hammered until “flush” with the head of the body of the fixing. Many anchors specify 35mm embedment into a 40mm hole. The “wedge” or drive pin of the Anchor is often 43-43mm and therefore will not be expected to go flush. Continual hammering of the anchor, especially with the 65mm versions that have been installed through soft materials (timber, Gypsum) will cause the anchor to delaminate and the two parts of the shank will splay and compromise fixing performance.
Other common mistakes are such as not drilling the hole in the concrete to the correct depth (typically 40mm). This will prevent the drive pin travel required to set the anchor correctly.
As with any fixing, it is important to observe the specific installation guidelines from each manufacturer.
Where the concrete strength is unknown for instance on refurbishment projects, a site pull test can be carried out to determine the suitability of the fixings in the base material.
Drop in or wedge anchors are anchors designed for concrete only, that work by the anchor being “dropped” into a pre-drilled hole. A setting tool is then used to drive the central wedge down the anchor body to create expansion. There are some common mistakes made when using the anchors.
One is not using the manufacturers correct setting tool for the anchor size which is essential to gain the correct depth to produces the right expansion. When set with a setting tool not only can you visualise the flange of the setting tool meet with the lip of the anchor, but also hear the ‘tone’ change. Some setting tools also leave witness marks on the rim of the anchor to confirm set correctly, ideal for quality assurance checks.
Another mistake made is in relation to drilling diameter and depth. This must be adhered to as per the manufacturer’s instructions. With anchors without lips, over-drilling can allow the anchor to sit too deep from the surface of the hole and not allow the setting tool to work properly.
All anchors that have an ETA approval guarantee the anchor is fit for purpose and will not fail once it has been installed following the manufacturer’s guidelines. Dust extraction tools are needed to clean out the pre- drilled hole for all ETA approved anchors.
Etag have a wide range of drop in anchors and accessories from premium brands available for your project.
Introducing the most powerful gas nailer in it’s class, the Sympafix ISO 200. It is 4 times faster than screw type insulation fasteners as it shoots a direct fixing of hard and soft insulation on concrete and solid stone without drilling. It is suitable for fixing to concrete framework and blockwork. It can also fix external and roof insulation. The ISO 200 can correctly fix insulation from 25mm to 200mm thickness. It reduces the risk of hard arm vibration and creates less dust. Sympafix are serious about fixings and specialise in innovative products for the construction industry.
The C70 is a powerful gas nailer from Sympafix and the only gas nailer in the world that can shoot 15mm -70mm nail in to concrete, steel and brickwork. It has the largest and most diverse pin range on the market with 3 diameters of nail and 16 different lengths making it fit for purpose for all applications in all base materials. The nailer is widely used throughout the drylining industry as it is designed for deflection heads. Easy to maintain and an improved motor for longer battery life, makes this tool a must have on site. Sympafix are serious about fixings and specialise in innovative products for the construction industry.
Discover more about chemical fixings and the importance of correct installation. Chemical fixings are widely used in the industry due to the benefits of high performance in all substrate types, closer spacing and edge distances and high strengths for fixing rebar and threaded studs. We look at the importance of hole cleaning and replicate installation methods we see on sites and perform pull tests to produce comparison results. Etag supply a wide range of chemical resins and accessories for all your application needs from premium brands such as Sympafix and DeWALT.
Launching Etag’s Centre of Excellence – technical advice when you need it. The Centre will focus on training, best practice and resources on Etag’s vast product range. Bringing together industry standards with innovative products and highlighting correct procedures in construction. Short videos will be provided on certain products, giving demos and technical information from Etag’s team and guest suppliers.
‘The short videos will give answers to questions our customers have on products’, says Technical Support Manager, Ian Harris.’ In the current climate, we can’t get out to site as often as we would like to and provide demos. Our videos will provide technical knowledge and allow customers to see the full extent of our service as well.’
Ian has been working within the fixings industry for a number of years in various roles in technical support and product training. He is also a member of the Technical committee of the Construction Fixings Association.
Well known brands will also feature in the videos, starting with Sympafix. ‘They have innovative and unique products that can bring efficiency without loosing any quality of work’, Ian states. ‘Going forward, Etag will be working with more of our suppliers to highlight the innovation within the construction industry.’