The steel core in this plasterboard fixing transfers the load from the board to the solid blockwork or masonry material behind and whilst other frame fixings claim to perform the same role these can severely distort and bow the plasterboard.

Hopefully someone will be along shortly who’s used them, but based on my experience of the normal ones I’d say to give them (AIR) a try.Fischer DuoPower and the blue coloured Rawl 4 All both spring to mind… Have I just outed myself as a wall plug nerd?

I've had better success with plasterboard fixings than I expected; they can actually take a fair amount of weight. 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.Corefix 120 (yellow) has a longer 120mm screw for securing fixtures of up to 30mm deep (eg wooden battens). The best plasterboard fixing to use, if you have masonry behind the plasterboard and need to support a heavy weight, would be the Corefix fixing. From the wide range of Cobra wall fixings and hooks you can find the right fixing for any wall or application, from plasterboard to wood or concrete, heavy duty items to picture frames as well as many self-drilling fixings which only require a screwdriver to install.

Its unique steel core transfers the load to the blockwork behind the plasterboard, preventing the plasterboard from crushing into the void. One massive design flaw/failure on the part of Corefix to fully inform the user - DO NOT use any sort of power tool to install.Cobra Anchors are the leading wall fixings manufacturer in the USA and Canada and distribute internationally.

However make sure that you have sufficient space between the plasterboard and the wall behind it to allow the fixing to be inserted fully before opening out.The screws do appear quite long when first seen but as they have to go through the plaster board then the gap and then into the brick it is understandable why they are this length and give the support the do. To be certain, you may need to drill a small hole though the plasterboard; with drylining you will normally find a void behind the plasterboard and solid masonry at a depth of between about 20-40mm. 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. To determine what kind of wall you have, you can tap them; drylined walls will generally sound hollow and in certain places will give off a duller sound, indicating the location of an adhesive blob (dab) or a timber batten.