Suitable fastening screw for mounting DHW in hollow concrete block

[JRH77]

Hello!

I'm going to hang a water heater in the basement.

So roughly about 100 kg.

The basement wall is made of hollow concrete blocks, and I don't know how to hang such heavy items safely on that material.

My initial thought is that through bolts would be the best, but unfortunately, that's not possible in this location.

I know there are special fasteners for different materials, but I have no clue about this particular case with hollow concrete blocks.

I would appreciate any suggestions!

 

[kniv]

Anchor compound is often good for hollow blocks

 

[Plupp 405730]

Yes, anchoring adhesive is good, but when installing in hollow brick material, you should use a Perfo sleeve. Fill the entire sleeve with adhesive. Press and twist in the bolt. Let it cure. Knock away any excess cured anchoring adhesive.

https://www.essve.com/sv/bygguider/allt-om-betong-och-lattbetong/ankarmassa-sa-monterar-du

 

[jonaserik]

A rule 45X95 that is attached with 4 long screws in the wall and the VVB is attached to it, you can see where the joints are. So drill about 2 cm away, and there is homogeneous material there. The problem with hollow bricks is that there are cavities in them and no plugs hold, filling the cavity with anchor mass is possible, but there is no guarantee that it will be correct in a cavity.

 

[Harald Blåtumme]

There are plugs that grip well in hollow concrete blocks, such as these Duopower from Fischer: https://www.fischersverige.se/sv-se/produkter/standardinfaestning/nylonplugg/universalplugg-duopower

_
PS. The trick with these is that you have to drill carefully so as not to create large holes in the walls behind the hollow blocks. Low impact force on the hammer drill is a maximum, similar to drilling in tiles and delicate materials. Or perhaps no impact at all, I don't know, I've only used it once so far.

 

[JRH77]

Anchor mass can be good for hollow blocks.

Yes, anchor mass is good but when you install it in hollow brick material, you should use Perfo sleeve. Fill the entire sleeve with mass. Press and twist in the bolt. Let it cure. Chip away any excess cured anchor mass.

[link]

Reading up on anchor mass, a Perfo sleeve seems to be good, should you fill the holes in the hollow brick first with anchor mass, then press down the sleeve, then fill the sleeve with anchor mass, then screw in the threaded rod?

A rule 45X95 fastened with 4 long screws to the wall and the VVB fastened to it, you can see where the joints are. So drill about 2 cm from it, then it's homogeneous material there. The problem with hollow brick blocks is that there are cavities in it and no plugs hold, filling the cavity with anchor mass is possible, but there's no guarantee it will be right in a cavity.

Yes, some kind of mounting frame in wood or steel, to distribute the load over several holes in the hollow brick, even to take support from the floor and ceiling for relief.

As you say, the cavities are tricky, you don't have much idea what you're doing or what the end result will be.

There are plugs that grip well in hollow concrete blocks, like these Duopower from Fischer: [link]

_
PS. The trick with these is that you have to drill quite carefully so you don't punch large holes in the backing walls in the hollow brick. Weak impact force on the hammer drill is max, similar to drilling in tiles and fragile materials. Or maybe no impact at all, I've only used it on one occasion so far.

Interesting, light and clever solution, DuoPower 14 x 70 should grip well.

As said, not entirely easy, I see that the VVB in question can also be mounted horizontally, set up a sturdy table in the appropriate dimension, and simply mount it lying down.