Drywall – How to anchor to a 1″ thick hollow wall with a very shallow cavity

If your brick is solid and does not seem to be crumbly (like in +100 year old house) then I would always suggest and even my self use and Anchor bolt - In some countries called a robolt - These are on of the best load and pull rated bolts. And I always try to use these bolts because you can never be sure about who will put what on a shelf. Using these bolts if installed correctly(not difficult) are rock solid.

• The downside to using these bolts is that you need to drill very deep into the brick. 8-10cm for a small bolt.
• The upside though is that it passed the monkey test¹.

All you have to do is:

1. drill the correct diameter holes into to the wall as straight as possible in the correctly marked locations.
2. Remove the bolts mechanism, feed the threaded rod through the rail and replace the bolt mechanism on the other side of the rail.
3. Repeat at key location on the rail.
4. Place against wall and insert all bolts as evenly as possible.
5. They sould slide in easily but you apply more pressure to get it in there.
6. Tighten each bolt until you feel it getting harder turn the wrench.
7. You want to get it tight enough where you feel enough pressure that will make you change your standing stance. That should do it.
8. By this point it should pretty rock solid!

And because this is for your home and not a building site you would finish it off with a bolt "nut" cover. This will give you some extra points with the wife for paying attention to the finer details. You can get various shapes, colours and finishes. Or just paint over them.

Using anchor bolts makes you only have to worry about the bearing load of the brackets and shelves you use. But it is obvious the shelf max load should not exceed the anchors load capacity to be safe.

I have seen shelves that collapsed because the bracket could not hold the weight but these bolts stayed put!

Disclaimer: Just a bit of humour but entirely factual.

¹Monkey Test

It is a test that is taken out on shelves , hooks or other newly installed equipment that will be used to hang things off. The test is simple. Hang on the object and wiggle like a monkey. If it does not rip/pull out / bend or create damage to the area around it. It is monkey proof and guarantees to carry ridiculous load. ^{Tested in South Africa in camping sites near nature reserves on outside fixtures}

A wooden shelf that is cantilevered 3 inches or so out from the end of a bracket will probably survive some load. But stack too much of a load on it (a pantry, canned food is heavy!) and even wood will crack. Particle board is very likely to fail of course as it has very little real strength.

A shorter bracket will often be designed for a smaller load. (Long brackets may be wider at the base, to support a larger load. They may be more robust to prevent buckling.) The issue is not just will it support the entire width of the board, but is the bracket adequate to support a greater load since a wide shelf will have more items stored on it. Those extra items stored are hanging a significant distance away from the wall.