What wall plug or fixing do I need depending on the type of wall?

"Will this hold on the wall?" is the question most often answered wrongly by eye, especially when the item to fix weighs more than usual. Choosing the wrong plug doesn't always fail at once — sometimes it gives way months later, with whatever was hanging on it.

Screws and fixings: the plug according to the wall material

Always choose the plug according to the wall material (solid masonry, hollow partition, plasterboard) and the weight to bear: a standard plug in a hollow partition doesn't hold the same as a chemical anchor in concrete. It's not a catalogue choice, it's a question of what material is behind the wall.

Wall fixing: when a chemical anchor is needed

For heavy items (loaded shelves, wardrobe rails, sanitaryware), the chemical anchor is used mainly in concrete or solid brick, where it bears much greater loads than a standard expansion plug. In a hollow partition, always consider anchoring to the studs or using specific cavity load-bearing plugs — a generic plug in a plasterboard sheet isn't designed for that weight.

Silicone: not all of it is for the same thing

• Sanitary silicone (with fungicide): for bathrooms and kitchens, where there is constant damp.
• Neutral or building silicone: for the rest of general joints.
• Acid silicone: cheaper, but can damage certain materials such as marble — avoid it on natural stone.

Mounting adhesive: fixing without drilling

High-strength mounting adhesives allow light or medium items to be fixed without drilling, very useful on surfaces that can't or shouldn't be drilled (tiling already laid, rented surfaces).

Frequently asked questions

When do I need a chemical anchor instead of a normal expansion plug? For heavy loads on concrete or solid brick — the chemical anchor bears much more weight than a standard expansion plug on that kind of substrate.

Can I fix a heavy wardrobe rail directly to plasterboard? Only by anchoring to the metal studs or using specific cavity load-bearing plugs; a generic plug in the board alone can't safely hold that weight.

Which silicone do I use on a marble joint? Neutral silicone, never acid — acid can damage marble and other natural stone.

Conclusion

Choosing the plug and silicone according to the wall's real material —not out of habit— is what prevents a fixing from giving way months after installation. It's a decision that costs no extra time at the moment, but determines whether the work lasts in the long run or has to be redone.