Metex Knowledge Base
Corefix is not reliant on the strength of the plasterboard, it transfers the load directly to the solid masonry behind via the steel insert. Most traditional fasteners used for drylined walls impart a point loading on the plasterboard, which when the screw is tightened crushes the plasterboard into the void, potentially damaging the wall finish and visually distorting the wall.
Fixings reliant on the strength of the plasterboard alone may not be suitable to reliably fix heavy items.
Corefix provides a quick, easy and reliable solution to a long term problem. Previously fixing to drylined walls has been notoriously difficult with many builders devising time consuming ways of overcoming this, such as drilling a larger hole in the plasterboard and inserting a homemade spacers.
Corefix original (Red) is the standard go to fixing for installations where the fixture thickness is up to 10mm (eg metal brackets). Independently tested safe working load of 100kg on 4 x fixings
Corefix Air (Blue) has been created to highlight the suitability for use when fixing into thermalite/aircrete blocks as this type of wall construction is notoriously difficult to fix to. Independently tested safe working load of 73kg on 4 x fixings in thermalite/aircrete blocks.
Corefix Plus30 (Yellow) has a longer 120mm screw for securing fixtures of up to 30mm deep (eg wooden battens). Independently tested safe working load of 100kg on 4 x fixings
All Corefix fixings have high load ratings and performance and are suitable for use in all types of brick and block, including lightweight/aircrete blocks.
A dot and dab wall also known as a drylined wall is where plasterboard is attached to a solid brick or block inner skin of a cavity wall (or in certain cases a solid wall) by the use of dabs of adhesive or wooden battens. This creates a small gap between the plasterboard and the supporting wall.
A stud wall or stud work wall - is where a wooden frame is constructed to create the room partitions and the plasterboard is then attached to the framework. This is often favoured in upper floors of houses as it reduces cost and simplifies the supporting wall requirements at ground level because it is much lighter. Corefix is not suitable for Stud Walls because there is no solid wall behind the plasterboard for Corefix to attach to.
For all UK orders we will dispatch the same day for orders placed before 3pm Monday to Friday. Orders will dispatched via royal mail using a 2nd class service.
Orders placed on a Saturday or Sunday will be dispatched on the following Monday
For urgent, next day deliveries if placed before 3pm we will dispatch these 1st class post for an additional £3 +vat, please call the sales team to place your order on 0800 130 3646
Please ask the sales team for pricing and delivery times for any EU or international dispatches.
Corefix is supplied with a countersunk 5.0 x 100 screw as standard. The screw is 100mm long and 5mm across the maximum diameter of the threads with the head maximum diameter being 10mm.
Corefix Plus 30 is supplied with a countersunk 5.0 x 120 screw as standard. The screw is 120mm long and 5mm across the maximum diameter of the threads with the head maximum diameter being 10mm.
Corefix is suitable for almost any wall hung object, including very heavy items. It is particularly suited to shelves, wall cabinets, wall hung TVs, boilers, radiators and hand rails.
Corefix can be installed extremely quickly without specialist tools or drill bits. All that is needed is a 10mm masonry drill, hammer and screwdriver.
Simply drill the hole through the plasterboard and into the solid wall behind, ensuring the total depth is a minimum of 100mm, remove any dust or debris from the hole before gently tapping the Corefix plug into place until the flange sits against the plasterboard. Tap the steel core home until flush with the plug, then install your bracket using the supplied screw. For more information please refer to the videos and datasheet.
Corefix has been rigorously tested in house and also by an Independent Test Laboratory and has been proven to safely support huge loads. The recommended safe load of 100kg (4 x fixings) includes a conservative Factor of Safety (see datasheet for further details).
This will depend a lot on what is behind your plasterboard wall and what fixings you are going to use. If you are dealing with a plasterboard dot and dab wall / drylined wall then you will have no problems at all in fixing your flat screen TV to the wall using the Corefix product (and providing you follow the instructions of course.) Corefix is designed to provide a rock solid fixing into these types of internal walls. In fact Corefix has been independently tested to 100kgs loading* and has safely held 250kg in our own internal tests*. It is highly unlikely your TV will weigh more than 40kg (even the Samsung 75” TV we weighed was only just over 30kg.) See our guide on installing a wall-mounted TV.
Corefix bridges the cavity with steel and is suitable for use with voids up to 25mm (excluding plasterboard thickness).
We would recommend using a wire and pipe detector, although care should be taken as these may not detect plastic pipes where used. Typically wires should run either horizontally or vertically to switches or sockets.
Corefix is extremely robust and able to support huge loads, however care must be taken with cantilever brackets as the combination of a heavy item on this type of arm increases the forces on the wall significantly. Therefore when cantilever brackets are used tests should be conducted to determine security of fixing, regardless of wall construction or fixing type used.
It’s important to understand this so that you can use the correct fixing for the safe fixing of loads. Here are a few clues to help you determine what sort of wall you are dealing with if it has a plasterboard finish.
- Unless your property has a timber frame construction, the ground floor walls, even internally, are almost certainly going to be of a dot and dab construction
- Dot and dab walls always sound less ‘hollow’ if you tap them
- Dot and dabs walls are typically thicker as there has to be a solid wall plus the void behind the plasterboard and the plasterboard itself The common term used for the fixing used for attaching heavier objects to these types of wall such as shelves, televisions, radiators and all manner of cupboards and units is the rawl plug - not a raw plug as it is often mistakenly called. This covers a multitude of different styles of which Corefix is just one and you may also come across terms such as wall plug / wall anchor and drywall anchor.
If your plasterboard wall is of the dot and dab / drylined wall type then definitely yes you can fix your Boiler and Radiators to that plasterboard wall if you use the right type of plasterboard fixings and for us that means Corefix.
Corefix has been specifically designed to provide a safe, secure fixing into these types of internal walls. To give you more peace of mind Corefix has been independently tested to 100kgs loading* and has safely held 250kg in our own internal tests*. So Corefix is without doubt the right fixing for this job.
Unlike inferior plastic versions, Corefix has a steel core and this transfers the load from the plasterboard to the solid blockwork or masonry material behind the plasterboard, so whilst other frame fixings claim to perform the same role they can severely distort or crush the plasterboard into the void – not what you want when your boiler is dependent on them holding secure!
For more detail on how to safely fix a boiler and radiators to a plasterboard wall, see below:
The correct term used for the fixing used for attaching heavier objects to plasterboard walls is the rawl plug. The rawl plug got its name from John Joseph Rawlings who invented this simple yet universally used fixing way back in 1911. The basic concept is that these plugs fit in a drilled hole and enable a screw to be securely fixed into material that is either porous or brittle or that would otherwise not support the weight of the item.
This is a term used to describe plasterboard wall fixings.
The commonly used rawl plug and screw is a classic example but for a more secure and safe fixing the Corefix solution is hard to beat. This is because, unlike the rawl plug and screw solution, Corefix bridges the gap between the plasterboard and the solid wall behind it, so ensuring that the load is spread between the plasterboard and the solid wall.
This means that Corefix can safely support heavy loads - 100kgs (independently tested) and over 200 kgs in-house tested.
The best plasterboard fixings to use where a heavy load is going to need to be supported would be the Corefix fixing. Corefix – unlike other typical rawl plug based fixings - will bridge the gap between the plasterboard and the solid wall behind it. This means the load is spread and it’s not just the plasterboard itself taking the strain. As a result you will get a very strong, safe fixing. Corefix has been independently tested to a load of 100kgs and has been in-house tested and proven to safely support over 200kgs!
The best fixings to use for a dot and dab wall, where a heavy load is going to need to be supported would be the Corefix fixing. This is because Corefix – unlike other typical rawl plug based fixings - will bridge the gap between the plasterboard and the solid wall behind it, thus spreading the load and ensuring a strong safe fixing. Also Corefix has been independently tested to a load of 100kgs and has been in-house tested and proven to safely support over 200kgs!
This is going to depend on the type of plasterboard wall you are dealing with and the quality of the plasterboard fixings to be used. If your plasterboard wall is a dot and dab / drylined wall then yes definitely you can fix your Kitchen Wall Cabinets to that plasterboard wall but only if you use the correct type of wall fixings and for that we recommend Corefix.
Corefix has been independently tested to 90kgs loading* and in our own internal tests has safely held a whopping 250kg*. How can Corefix do this? Because these fixings have been especially designed to provide a secure fixing into exactly these types of internal walls. Of course other frame fixings will claim to perform the same role but unlike these inferior plastic versions, Corefix has a steel core which transfers the load from the plasterboard to the solid blockwork or masonry material behind the plasterboard. This is what prevents the load can severely distorting or crushing the plasterboard into the void – which is what is likely to happen over time with the other inferior fixings. Not what you want when your Kitchen Wall Unit is full of your best crockery – a gift from the mother in law!
See our guide to find out more about how to safely fix wall hung cabinets on a plasterboard wall.
In the UK a Hollow Wall means “a masonry wall with an air space between the inner and outer wall.”* This is also known as a Cavity Wall or a Hollow Masonry Wall.
However in the USA. a hollow wall is their term for a plasterboard stud wall or a dot and dab wall. That is an internal wall made up of a plasterboard face – air space - brick or block wall. The phrase hollow wall is creeping into the English language (mainly via the internet) so you might see the term Hollow Wall Anchors referred to in connection with internal Stud Wall / Dot and Dab Wall Fixings. For more on Hollow Wall Anchors see the FAQ item below.
Based on the UK definition of a hollow wall then a Hollow Wall Anchor would be a fixing that secures a load to a hollow or cavity wall. But as the term Hollow Wall has started to become used to describe what is more accurately a Dot and Dab or Stud Wall then the term Hollow Wall Anchor has also become extended to cover Rawl Plugs as well. For this reason it is important that when fixing to an internal wall you use the correct fixings for the job in hand and logically before you can determine the best fixings to use you need to understand what type of wall you are fixing into!
Corefix is a true heavy duty fixing designed specifically to secure heavy loads to dot and dab walls, safely. Corefix has been independently tested to handle a loading of 100* kgs but our own in-house tests show that Corefix will securely support a staggering 250* kgs. To put that into context a 75 inch flat screen TV will be less than 40kgs.
*using 4 Corefix fixings.
Corefix is the fixing you need to use.
Independently tested and certified, Corefix has been specifically designed to safely fix heavy duty cabinets, shelves, radiators, TVs etc. to dot and dab walls. It’s easy to use – no specialist tools – and it’s fast becoming the fixing of choice for kitchen fitters and plumbers and serious DIYers.
Using Corefix yes you can.
Corefix has been especially designed to solve the problem of how to safely secure heavy loads to dot and dab walls. Corefix has been independently tested and verified to a safe working load of 100kg using 4 fixings.