What blocks to use

[an203888]

OK - I will be externally and internally rendering/plastering my extension and the main block I will be using will likely be a standard Celcon 3.6N block.

However I have an internal wall which needs to be 150mm wide and will be a supporting wall for my main two beams where I knock through the kitchen into the extension. The house is two storys. The plans just say "150 dense concrete block" but they say this for every wall!!. Can a lightweight 3.6N block be used or should it have something more substantial?

Obviously there would be a padstone where the beam sits on wall.

Thanks

 

[tony1851]

Why do you need "150mm dense concrete block" walls internally?
What sort of loads do you have which need such thick walls?
Has your plan drawer/architect drawn plans before?

 

[an203888]

I will be knocking a 6.5m hole through the back of my house and this wall will be supporting everything above about 2 meters away from one end.

 

[an203888]

Talking with a few people they do need to be solid dense concrete blocks but 150 isn't common so 140 wide is fine..