Drill a hole through the plasterboard and into the solid wall behind, ensuring the total depth is a minimum of 100mm.

It does however have a few pitfalls, not the least of them being thermal bridging where the cold temperature of the masonry is transferred, via the plasterboard adhesive, to the inside of the plasterboard wall. In 2017 statistics show that almost 80% of people are installing TV’s which range between 40 and 55 inches (Source Statisista.com). masonry screws, but would have to be at least 100mm long if not longer and might cut into the PB + Insulation under weight Corefix can be bought from most high street DIY stores today including B&Q, Screwfix and the similar. A screw, in this gap, is not supported and any heavy load applied to the end of it will cause the screw to bend.So the first 3 layers of my 1950s wall are plaster on insulated plasterboard (PB + 40mm PR bonded at factory). Beyond that, it's wet plaster, but as mentioned by another poster, it could be 3mm or it could be as much as 20mm. Remove any dust or debris from the hole before gently tapping the Corefix plug into place until the flange sits against the plasterboard.

This can result in cold spots on the wall which, in turn can result in condensation and condensation around the window reveals of a dot and dab plaster boarded room is very common. We will discuss this, and the wonderful advantage of Corefix a little further on. First, take a look at the video above where you will see just how powerful the Corefix dot and dab plasterboard fixings are. Why is Fixing to Dot and Dab Plasterboard a Problem? The diagram shows what Corefix can hold and 250kg is almost 39.5 stone or 3/4 averagely built people – That is very impressive indeed. How and Where do I buy Corefix?Once the plug is in the wall, a steel tube is pushed into the end of the plug. This tube is hollow and very very strong. It is long enough to go right through to the masonry wall where it, after being hammered home, forms a really tight fit about 25mm into the masonry wall. We know the problem with fixing to dot and dab is the unsupported length of screw between the wall and the board. Corefix decided to keep it very simple and say that the solution is obviously to find a way of supporting it! And boy have they done that! Coach screws maybe. Ideally I'd use the 5 different 10mm holes I've already made into the wall. So they'd have to be 10mm x 100mm min in dimensions. Thanks for all the replies, appreciate the input. Only now managed to catch up on the various suggestions.