can I square up an already built aircrete block corner wall

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kay4ng

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I am currently building a 3m X 3m rear extension (-permitted development) with 2 types of Aircrete blocks - 215mm (x 440L x 215H) and 140mm (x 440L x 215H). At one corner where these blocks meet, I just noticed that the 140mm blocks are vertically out of square by about 8mm at the widest point.

This bad corner has already reached its maximum Ht & W (1000mm x 550mm) made up of only 4.5 block columns containing only 1.5 blocks in each row horizontally because it has a window opening (1m W x 1.2m H) and will also be a sloped wall ending at maximum height (1.1m) when a bond beam(100mm H)is added.

I don't want to knock them down as they are bonded to the perpendicular 3m (21mmm) wall- too much mess /may require wall starter kit -bad at corners. As they are aircrete, can I build up the 8mm difference using special fibrous cement like Sika products ?. Also any suggestions of the right Sika mortar etc- overwhelmed with too many -too much research driving me crazy.
 
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You lost me a bit after the first paragraph, but if the problem is just “corner is a bit out of square” then a common fix is squaring it up when you dab your plasterboard on.
 
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23vc said:
You lost me a bit after the first paragraph, but if the problem is just “corner is a bit out of square” then a common fix is squaring it up when you dab your plasterboard on.
Click to expand...

The building is ongoing. It is the external wall (one solid leaf) that is not square starting from the 1st row of blocks on top of the already installed 1st bond beam. All the blocks on top were plumb and level but out of the original 90 degree angle -square. I am worried that they are not structurally safe but as a 2nd bond beam will be installed on top of them, they maybe safe enough to withstand lateral stress e.g. strong winds / hurricane. What do u think?
 
^woody^ said:
What is "vertically out of square" when it's at home? o_O
Click to expand...

Okay, the 1st row of blocks are not square and so while all the blocks on top are plumb and level with regard to the 1st row, the whole wall is not "True".
 
In the scheme of things this is not that big an issue. Internally this will be overcome with the plaster/boarding, same for render or cladding externally, and the roof can be squared up too.

If need be, and whether this is horizontally out of square, or vertically out of plumb (I'm still none the wiser and the gin didn't help one but) then you could just step the next course out or in and then start afresh from that point.
 
23vc said:
How far out are the square courses from the nonsquare courses? Got a pic?
Click to expand...

The 1st row (on top of the concrete bond beam- which is wider than the blocks underneath and such led to our miscalculation of the exact square /plumb line) is out by 8mm. As the 1st row of blocks are not square, although all the blocks on top of them are plumb with regard to this 1st row, the whole wall is not "True".

Read more: https://www.diynot.com/diy/threads/can-i-square-up-an-already-built-aircrete-block-corner-wall.523444/#ixzz5p2mu1Fvk
 
23vc said:
How far out are the square courses from the nonsquare courses? Got a pic?
Click to expand...

There is a 90mm concrete/ rebar bond beam between the square courses and this recent unsquare rows.
 
^woody^ said:
In the scheme of things this is not that big an issue. Internally this will be overcome with the plaster/boarding, same for render or cladding externally, and the roof can be squared up too.

If need be, and whether this is horizontally out of square, or vertically out of plumb (I'm still none the wiser and the gin didn't help one but) then you could just step the next course out or in and then start afresh from that point.
Click to expand...

Thank you so very much- that's what I was thinking to do but was afraid that the protruding external wall sections will be point of weakness / cracking and therefore destruction by strong winds. I guess I can shave off (-as its soft aircrete) the extra protruding external wall sections and build up the internal sections with reinforced mortar like u suggested.
 
23vc said:
You lost me a bit after the first paragraph, but if the problem is just “corner is a bit out of square” then a common fix is squaring it up when you dab your plasterboard on.
Click to expand...

Thank you so much. I thought of this remedy but was not sure it could be used here. Now, u have settled my mind and I can sleep easy. The work you do here is much appreciated. Many times, I get my answer by viewing previous replies to problems. More grease to ur elbow.
 
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