Hi,
I will be bricking up a window opening (1.5*1.4m) where the wall material is blue concrete (an extension built in the 60s). I've asked around in building supply stores about mortar and what type of blocks should be used to fill the hole - the answer was lightweight concrete blocks since it is already the material of the wall. So use the same material the wall is made of and don't mix, that was the answer.
Just out of curiosity (and for my wallet). What could be the consequences if I choose to use Lecablocks instead? The lightweight concrete blocks are more than twice as expensive and as I understand it, there isn't much difference in U-value and other properties.
Any opinions?
I will be bricking up a window opening (1.5*1.4m) where the wall material is blue concrete (an extension built in the 60s). I've asked around in building supply stores about mortar and what type of blocks should be used to fill the hole - the answer was lightweight concrete blocks since it is already the material of the wall. So use the same material the wall is made of and don't mix, that was the answer.
Just out of curiosity (and for my wallet). What could be the consequences if I choose to use Lecablocks instead? The lightweight concrete blocks are more than twice as expensive and as I understand it, there isn't much difference in U-value and other properties.
Any opinions?
Take what you want, lightweight concrete/leca/brick and use what you have in the storage, plaster mortar/lime mortar or similar, it works well for patching. You can, if you want, put a thinner part on the outside to be plastered, have a piece of styrofoam or rockwool between the outer and inner masonry, it will then provide extra insulation for the hole.