u/AdeQQ

Hi all,

so I would like to extend a partition wall made of silicate blocks in a newly built apartment by 60 cm, using aerated concrete blocks (which is common in my country) with a thickness of 11.5 cm (exact dims of each block 60cm x 24cm x 11.5cm). I have chipped out the floor screed at the extension point and removed the plaster, but I have come across water supply pipes.

I therefore have 2 questions:

1. Can such a wall be founded on a thicker layer of cement mortar, with a sufficiently large recess (approx. 5cm x 10cm) cut into the first block to accommodate the pipes, while simultaneously filling the gap between the pipes and the block with foam?
2. Does such an extension require a waterproofing layer (HDPE foil), given that the apartment is on the 1st floor?

Hi all,

so I would like to extend a partition wall made of silicate blocks in a newly built apartment by 60 cm, using aerated concrete blocks (which is common in my country) with a thickness of 11.5 cm (exact dims of each block 60cm x 24cm x 11.5cm). I have chipped out the floor screed at the extension point and removed the plaster, but I have come across water supply pipes.

I therefore have 2 questions:

1. Can such a wall be founded on a thicker layer of cement mortar, with a sufficiently large recess (approx. 5cm x 10cm) cut into the first block to accommodate the pipes, while simultaneously filling the gap between the pipes and the block with foam?
2. Does such an extension require a waterproofing layer, given that the apartment is on the 1st floor?

Edit: a sketch of what I want to make: Imgur and how the pipes look in the floor: Imgur