Crafty: You can get from Builders Warehouse and a few shops bolts that are specifically made for that purpose, although I have seen people make use of threaded rods. But I have tried it, and while the one I installed did carry a full hifi and speakers, I used 4 rods/bolts. Things I have learned,
- Go to a place that have a stand drill so that they can drill the holes into the piece of wood. If these holes are not close to perfectly 90 degrees it is a mission to get it into the wall.
- Make sure that wall is double brick wall.
- Place shelf against wall and mark the holes onto the wall (while shelf is perfectly level),
- Drill small 6 mm holes into wall, put in thin wood dowels and dryfit the shelf. Dowels as long as the bolts you intent to use. MAKE SURE IT FITS 100%. See below.
- drill holes to size in wall. I used 10 mm rods (12 mm hole). Total weight was about 15 kg .. shelf and hifi.
- dryfit
- try and remove dust from hole
- put in liquid cement (cannot remember the product I used, looked like these big silicon tubes). Do not try to fill hole.
- knock in rods.
- put minimum amount of sealant into holes in wood. It is there just to keep it into place.
- Fit.
- Stand back and admire your work.
Do not follow this process.
- Drill holes in wall.
- Drill holes into wooden shelf.
- Dryfit rods. Try and fit wooden shelf. Realize it does not want to go in as the holes relatively to each other is straight.
- Swear, and drill new holes into shelf. Holes do not line up. Swear more.
- seal holes in wall and drill new holes. More careful this time.
- test fit. Holes line up. Do not use correct length rods for test.
- add cement into wall. Add silicon into shelf.
- Put in correct length rods. Put in shelf. Use piece of wood and mallet to gently tap into place.
- Realize correct length rods longer than test pieces of rods to see if holes are lining up.
- Get bigger hammer. Knock into hole. Cement splatter everywhere. Hear hell of commotion.
- Goto next-door room and admite the large piece of plaster that fell off due to wall being only 1 brick thick, and holes were too deep, rods too long, resulting in 4 gaping holes in wall on other side. Swear some more.
- Get angle grinder to cut of pieces of rod sticking out on other side (about 5 mm).
- Go find guy that can do plastering work. Get plaster mix ....
etc etc.
On second thoughts, get a handy man
