hangingwalls
I would like to hang a blackboard (it could weigh 160 – 190lbs) on an interior wall made of hollow terracotta brick like this.
In the case of solid bricks I see there are a number of solutions readily available, but I'm not sure how to proceed in the case of hollow bricks.
Thanks in advance for any guidance.
Sounds like plaster walls and the ceiling is gypsum boards covered with just a skim coat of plaster. My house in the midwest US has a similar setup. It was during a transition period (40s-50s) from lathes to gypsum boards so the walls have lathe and then rough and finish plaster but the ceilings have gypsum boards covered with a thin finish plaster.
To hang pictures and stuff, I typically start the hole with a drill to get through the harder plaster layer and then tap the nail in the rest of the way. For heavy shelves in the closets, I've drilled holes and used those plastic inserts you tap in with a hammer and then put a screw into.
This may be thinking outside the box, but there are other ways to display a picture rather than "hanging" them. Hopefully these inspire some solutions...
Have you considered using some sort of display easel like the one above instead?
Google Search: Photo Display Easel
Compression poles are also an interesting way to hang things without causing damage:
Or if you are more industrious, you can construct some sort of free standing (or leaning) panel to hang the picture from. A nicely framed section of painted drywall or other type of surface can make a nice accessory for the room. It can be made free standing or designed to lean up against the wall without causing any permanent damage.
Best Answer
There is a class of anchors called "hollow wall anchors". Most of the time these are used for sheetrock or plaster walls so people don't think about them when it comes to brick, but many of them will work in hollow bricks. There are many types and should be available at any home store.
Sample toggle bolt
The challenge will be making sure you hit a "hole" in the brick. There are different anchors for hollow bricks and for solid bricks, so it probably make sense to have both on hand. If you drill a hole and hit a solid portion of brick, use the solid anchor. If you hit a hole, use the hollow anchor.
When hanging a large item like a blackboard, you may be able to adjust your hole spacing to make sure you always hit a hollow area.