Setting a cast-in-place anchor in just the right location can be a daunting task. It’s so difficult, in fact, that post-installed anchors are now becoming the preferred method for attaching wood, steel, and cold-formed steel components to concrete instead of cast-in-place anchors.
Special for fixing of suspended ceilings, ventilation systems, cladding, brackets and sheet metal in concrete.
Making the right Anchor Choice for Concrete.
Selecting the correct anchor for an application is not as simple as it may appear. There are actually several factors that affect proper anchor choice, so considering them all is essential.
When choosing a post-installed anchor consider the following main factors.
Interior exposure only will require low corrosion resistance whereas a sea-front application is a severe case requiring high corrosion resistance with other applications falling between these extremes.
Local regulations relating to structural loads will influence the selection of anchor. For example, in case of earthquake regions, anchors suitable for cracked concrete must be considered.
The material into which the anchor is being installed into is known as the substrate and includes concrete, lightweight concrete, brick etc.
The manufacturer’s catalogue will have a product selection guide indicating which anchors are most suitable for different substrates.
Factors to consider here include how close the anchors will be placed to the edge of the concrete, spacing between anchors, thickness of substrate etc.
Non expansion anchors such as Multi-Monti and Injection Mortar are better suited for close to edge fixing.
Thickness of the concrete should also not be overlooked. The Drop in Anchors are better suited for shallow substrates.
For thicker concrete, adhesive anchors will often have better capacity.
You can utilise the design software of the manufacturer to help in selection in this respect.
This is something that may be difficult to predict or control. Consider the following.