I'm in the process of planning a small lean-to extension(utility room),
about 8ft by 5ft and was wondering. Can the lighter 6kg airated breeze
blocks be used for:

1. foundations
2. internal cavity wall (later to be plastered)
3. external cavity wall (later to rendered).

TIA

Jon

Can the lighter 6kg airated breeze blocks be used for:

1. foundations

Usually, but check the specific product for suitability. Celcon Foundation
or similar is recommended for this application, but many standard blocks
should also suffice. However, a wide block like the Celcon Foundation
seriously reduces the amount of labour required, as you can lay the entire
thickness of foundation in a single course and only split into cavities
above the DPC level.

2. internal cavity wall (later to be plastered)

Yes.

3. external cavity wall (later to rendered).

Yes.

Christian.

Christian McArdle wrote:
Can the lighter 6kg airated breeze blocks be used for:

1. foundations

Usually, but check the specific product for suitability. Celcon Foundation
or similar is recommended for this application, but many standard blocks
should also suffice. However, a wide block like the Celcon Foundation
seriously reduces the amount of labour required, as you can lay the entire
thickness of foundation in a single course and only split into cavities
above the DPC level.

I always thought you had to use engineering bricks in foundations (I'm
not disputing what you say, just never heard of Celcon Foundation!)

David

I always thought you had to use engineering bricks in foundations (I'm
not disputing what you say, just never heard of Celcon Foundation!)

Nah. Most concrete blocks (including aerated) can be used in most soils, at
least according to the manufacturers. But you should check the particular
combination of soil and block.

Christian.

2. internal cavity wall (later to be plastered)

Yes.

3. external cavity wall (later to rendered).

Yes.

P.S. For further recommendations, use Celcon Standard in the outer leaf and
Celcon Solar in the inner leaf. However, you'll probably just end up at the
builder's merchants where they haven't heard of anything except bog standard
3.5N 440x215x100 and just have to work these into your original plan for
foundation, inner and outer...

Christian.

Lobster wrote:

Christian McArdle wrote:

Can the lighter 6kg airated breeze blocks be used for:

1. foundations


Usually, but check the specific product for suitability. Celcon
Foundation
or similar is recommended for this application, but many standard blocks
should also suffice. However, a wide block like the Celcon Foundation
seriously reduces the amount of labour required, as you can lay the
entire
thickness of foundation in a single course and only split into cavities
above the DPC level.


I always thought you had to use engineering bricks in foundations (I'm
not disputing what you say, just never heard of Celcon Foundation!)


Yes, I thought the reply was - a bit misleading, like saying 'you can
use brick for a fioundation' without saying 'but most people pouitr
concrete and use really exepensive ones up to the DPC, for good reasons.

David

In article ,
"Christian McArdle" writes:
I always thought you had to use engineering bricks in foundations (I'm
not disputing what you say, just never heard of Celcon Foundation!)

Nah. Most concrete blocks (including aerated) can be used in most soils, at
least according to the manufacturers. But you should check the particular
combination of soil and block.

Strange, as the thermal blocks used for internal walls will expand
when they get wet and contract again when they dry out, which sounds
like it would be really bad news in foundations below the damp proof
course. (You have to be careful plastering them for this reason.)

--
Andrew Gabriel

Andrew Gabriel wrote:

In article ,
"Christian McArdle" writes:

I always thought you had to use engineering bricks in foundations (I'm
not disputing what you say, just never heard of Celcon Foundation!)

Nah. Most concrete blocks (including aerated) can be used in most soils, at
least according to the manufacturers. But you should check the particular
combination of soil and block.


Strange, as the thermal blocks used for internal walls will expand
when they get wet and contract again when they dry out, which sounds
like it would be really bad news in foundations below the damp proof
course. (You have to be careful plastering them for this reason.)

That's why you use special underground non thermal concrete blocks.

I have to say that I did not consider celcon thermal blocks to BE
concrete actually.

Strange, as the thermal blocks used for internal walls will expand
when they get wet and contract again when they dry out, which sounds
like it would be really bad news in foundations below the damp proof
course. (You have to be careful plastering them for this reason.)

I have to say that I did not consider celcon thermal blocks to BE
concrete actually.

Clearly, the manufacturer disagress, though!

http://celcon.co.uk/index.php?do=Page&pid=146

Christian.