I need to attach heavy-duty brackets in the "old" type of concrete hollow blocks, the ones with many vertical channels and relatively thin walls in between. Can you use concrete anchors, plastic plugs? Or how should one proceed in this case?
Using a threaded rod all the way through would obviously be best, but it's not an option since there's a newly furnished laundry room inside, with cabinets mounted on the inner wall.
To describe a bit more, the brackets are meant to support a terrace floor. See pictures for how it looks. I have attached the wall's joist to each panel board and to the 45 x 45 stud that holds the panel. However, I feel that a sturdier attachment is required for the joist, and therefore I want to place large brackets under the joist and attach them to the concrete wall. Or is this unnecessary? Is the attachment I've made sufficient? Behind the panel and insulation, there's a solid timber wall, but it's 27cm to the timber from the outside of the joist (the house is additionally insulated with 2x45mm on top of the timber), but such long fastenings provide poor stability, right?
