Hello,
as a happy amateur, I have bricked up a doorway in a non-load-bearing wall made of light concrete. I used so-called lättklinker. It was a bit tricky to get mortar into the vertical gaps against the edge of the doorway, and I had great help from a narrow stick to "pack" the mortar down into the gap. Those of you who know about this can certainly laugh, but I managed to get the mortar in the end anyway :D I wouldn't think the professionals do it the same way... :blushing:

However, getting mortar into the horizontal gap at the top, above the top stone I placed—it wasn't easy. I gave up for the moment. Considering spraying some foam in the gap instead—right or wrong? Or will it be easier with plaster to seal the gap? I mean, it feels important that the new wall module is stable and well secured to the existing wall.

I've found a lot written about masonry here on the forum, but nothing about this little detail.
 
Use a trowel to get the mortar in.

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Aha, are there such...?! Thanks!
 
Have done the same thing at home and used expanderbetong so it becomes a little stronger iafl.
 
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