What is the wall made of???? Could be Brick, Plasterboard, Dry Line walls, Thermalite Block(more modern, very light) Breeze block, or even cast concrete.
Your problem is getting a 'fix' on the wall, once we have got that right, the rest is easy.
With exception Plasterboard and Dry Line walls...
For Brick etc..
Invariably, these are plastered walls, your screw length is critical, the plaster is about 1/2 inch thick, you need to be 1 inch into the Brick etc, so screw length minimum 1 1/2 inch PLUS whatever you are fixing.
Making your hole...Brick etc
With exception cast concrete, use a 'normal masonary drill bit' in brick, drill your hole using the 'Hammer' setting on your drill to allow for your screw length. Try the screw in the hole to ensure this point. For Thermalite (these are insulating blocks, with the texture of a 'Crunchy' chocolate bar) and Breeze block use a masonary drill, NOT on the hammer setting (else you will break the block to bits) For Cast Concrete (sometimes used in house build, often used for lintels over windows) you will need an pneumatic hammer drill and SDS drill bit ('black & decker hammer drill no good) This should drill a neat and sweet hole, same 'rules' apply, 1 1/2 inch minimum. You may have cast concrete walls, the drill may wander all over the place although you are using SDS. So, oversize the hole, be radical, if you really wanted a 6mm hole, drill out to say 12mm, clean the hole out, put PVA adhesive in the hole, then fill the hole with 4 sand 1 cement mortar pack it hard. If indeed you wanted a 6mm hole, push a 6mm drill in while the cement is wet, precisely where you wanted the hole, leave to dry hard.
For Plasterboard and Dry Line walls
Plasterboard or 'stud ' walls have a timber frame, ideally, use a stud detector to find the verticals, which should be 16 inches apart, then treat as wood. If you have not found any 'studs' likely you have a 'Dry Line' wall. For Plasterboard walls where the studs are in the 'wrong' places I like the metal plasterboard fixings (they WORK!) more expensive, but very good. Drill the required hole (Masonary Drill not required) tighten the fixing in. With Dry Line walls (plasterboard stuck to whatever blocks underneath) us a 'standard ' wall plug technique, I like the 'upmarket' grey plugs with lots of 'grippy' wings.
So, your actual fixing. Generally, use a gauge 8 screw for smaller jobs, 10 for bigger jobs, using a RED rawlplug for 8 gauge screw, and a BROWN rawlpug for gauge 10 screw, with the 'upmarket ' plugs (grey with lots of wingy bits, read the package)
So, we know how to get the fixings, now for the shelf. Depending on what is going on the shelf, select your brackets and spacing (heavier, closer for heavy things..books remember are really like lumps of solid wood not lightweight)
Mount your brackets to the shelf, place the shelf on the wall, and at one end, through one of the bracket holes, mark the wall. Before you drill, get in the habit of marking your hole 'better than a dot' put crosslines where the hole will be. Insert your plug/fixing when you have drilled your hole, the crosslines will show you if you got it right!. Get a Spirit level, insert your plug,screw the single screw/ bracket to the wall, check the shelf to level with the spirit level, then mark a hole through the bracket on the opposite end of the shelf, do as before with your crosslines, lower the shelf, drill your hole, plug and screw. Check your shelf is level, then mark the other holes, remove the shelf, follow the routine, and finish fixing your brackets.
I have assumed that you are using brackets, but in an Alcove battens will do, fix a strip to the wall. generally, all 3 sides of an alcove with battens. Here, you can cheat a little. Pre-drill 4mm holes in the batten, put the batten on the wall where you need it, use a 4mm masonary bit, drill into the wall on one end of the batten,open the hole to your plug size hole, insert plug, then screw to the wall. Level the batten. mark the wall through the batten at the opposite end, plug and screw as before. Heres the cheat. There are other pre-drilled holes in the batten, open these out to your plug size with a masonary drill, straight into the wall, to the correct depth. Put the wall plug on the tip of the screw, hammer the whole lot into the wall, leave a bit of screw sticking out, then screw up tight. this only works for rawlplug type fixing methods in brick/ thermalie/ breze block.
Hope this helps you...
2007-01-13 19:56:23
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answer #4
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answered by johncob 5
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