Wall plugs need brick, block or concrete to hold well.
Plaster just will not do, because it has minimal holding power.
It's normally way too soft you see. Sure, if the wall is plastered with tough cement render and thin skimming coats, you may get away with some light to medium loads, but typically the plastic plug needs to be pushed into the wall itself so it's whole length is into a brick, a block or concrete and so on
Many individuals want to learn how to use wall plugs. Because the way a wall plug works and holds in location is by expanding in a radially outwards style. Simply put, when you put a screw into a plastic wall plug (or an old fashioned wooden plug for that matter) it serves as a wedge, pressing the 2 halves of the plug apart and filling the hole really tightly. Friction then takes care of waiting in place for all eternity; useful things friction ... and it's complimentary!
Most wall plugs are only 1 1/4 ″ to 1 1/2 ″ (32 to 38mm) long and most plaster on walls is in between 1/2 (12.5 mm) to 3/4 (19mm) approximately thick. So, doing the maths and taking the density of the plaster far from the length of the plug you'll determine that not much of the plug is really going into the brick/block/concrete if you leave them flush with the plaster. Also, the front part of the brick is unable to take much load either without risking a 'fisheye' breakout under load.
Wall plugs work best when their WHOLE LENGTH is totally inside the walls primary building material, hence alleviating the plaster and the front face of the walling product from stress.
How to set up plastic wall plugs
- Mark out all your holes utilizing a level and/or tape measure.
- Carefully drill your holes, beginning slowly (perhaps with the hammer action off) until the drill bit forms a shallow hole (see picture above for depth), speed up and hammer back on to complete the hole.
- Vacuum out the hole if you wish to be truly correct, mostly not required or done nevertheless ... Push or tap your rawlplugs into your holes, flush with the plaster.
- Position the item to be fixed over the hole and put the screw through it and into the plug, twisting the screw a tiny bit by hand till it bites.
- Sometimes the above step is much easier if you push the screw all the way through the product and then you'll quickly get the pointy end of the screw into the plug, sliding the product down the screw till it fulfills the wall.
- Using a little hammer tap the screw to press the plug through the plaster and into the wall itself and stop when the length of screw sticking out equates to the length of the wall plug.
- Tighten up the screw, taking care not to push for the very first couple of turns or you might push the plug in much deeper (not good).
- Working this way ensures the plug is precisely the best depth into the wall and the screw will go all the method to the end of the wall plug when brought up tight.
- Perfect. Rinse and repeat with the other screws.
- Put the kettle on or go to the refrigerator depending on the time of day ...
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