Securing a chimney in concrete hollow block?

[jivanoff]

Hello!
I'm planning to install a chimney on the outside of my house, which will also involve passing a flue pipe through the base/foundation wall. The chimney will also need a bracket on the outside to support it. So the question is, what is the best way to attach this bracket to a wall made of concrete hollow block? Some form of expander? Screw and anchor? The basement wall here consists of 1 "layer" of hollow block as it is covered with OSB and gypsum board on the inside. Should I perhaps aim to go through the entire wall and use something like bolts and nuts with a large washer on the inside?
In the picture, the chimney is intended to come out between the window closest to the camera in the basement and the corner.

Tips and advice are gratefully received!
Jari

 

[KnockOnWood]

I would probably have excavated and poured a foundation slab to support the chimney instead of trying to attach it to the basement wall.

The basement wall is probably not designed to support a heavy chimney, in addition to the weight of the house.

PS
The basement is not particularly well insulated, right?
Bare ground closest to the house all around

 

[MaxPax]

Concrete hollow blocks can be difficult to ensure good fastening in, as they largely consist of cavities. I agree with the previous speaker, but perhaps a couple of properly laid plinths with thick rods to support the pipe would suffice...

 

[jivanoff]

The base plate is a bit difficult since the chimney is designed to be attached to a bracket. It is an NVI2000 steel chimney. No, the basement is not well insulated, no, that will come when it's time to drain again.

 

[MaxPax]

The chimney does not seem intended for anything other than installation through the joists and exiting on the roof. Have you read the installation instructions?

http://www.nvi.se/doc/Montageanvisning utgava_11.pdf

 

[jivanoff]

The one I am going to have is designed for towing on the outside: See pictures here http://www.nvi.se/galleri.html

 

[MaxPax]

The one I'm going to have is designed for exterior mounting: See pictures here [link]

Interesting. I haven't seen that kind of mounting before. Are you planning to go through the eaves?

Maybe drill, squeeze in anchor grout and insert a piece of threaded rod to secure with. 6 of those with large washers?

 

[jivanoff]

Yep, it should go through the eaves. Yeah, it'll probably have to be something like that, alternatively drill through the entire wall and use large washers on both sides. I have a gap and then the inner wall comes on the inside.

 

[Eld]

If you use anchor adhesive in concrete hollow blocks, you should first insert a distribution sleeve (that's what Hilti calls it). It's like a tube or plug made of plastic mesh that you then fill with anchor adhesive before inserting the threaded rod or whatever you need to attach. If you don't have it, you might end up pumping in lots of expensive anchor adhesive that disappears into the cavities of the block and serves no purpose at all.

However, I have often also succeeded in fastening with large facade plugs in concrete hollow bricks.

 

[jivanoff]

Yep, the builder's recommendation with some form of expansion screw failed completely. It came loose like crazy. Anchor compound, with perforated sleeves and threaded rods did the trick! It's rock solid!