Hello,
I would like to know how a concrete slab should be constructed for a semi-detached house. My concrete slab was added to an existing semi-detached house. Under the slab, a dimpled membrane and another membrane were installed. At the point where it connects to the other slab, the membranes were turned upwards so that they now extend between the two slabs. There is also a 1-2cm (0.4-0.8 inch) gap behind them, preventing direct contact between the slabs. Our neighbor and their architect said this could be a problem for sound insulation.
How should this normally be done, and what can be done now?
I would like to know how a concrete slab should be constructed for a semi-detached house. My concrete slab was added to an existing semi-detached house. Under the slab, a dimpled membrane and another membrane were installed. At the point where it connects to the other slab, the membranes were turned upwards so that they now extend between the two slabs. There is also a 1-2cm (0.4-0.8 inch) gap behind them, preventing direct contact between the slabs. Our neighbor and their architect said this could be a problem for sound insulation.
How should this normally be done, and what can be done now?
P
perlenmann12 Jul 2011 14:58Unfortunately, I don’t have the complete planning documents yet.
So, definitely remove the dimpled membrane.
Is the acoustic insulation mat really necessary? Can the joint be left open?
I just had a conversation with our surveyor. He said to remove the dimpled membrane and then install perimeter insulation. The perimeter insulation is supposed to prevent anything from falling in during masonry work, which could cause contact between the floor slabs. My main contractor replied that the fiberglass insulation will be placed against the neighboring wall before our masonry work starts, so nothing can fall in. Is that sufficient?
So, definitely remove the dimpled membrane.
Is the acoustic insulation mat really necessary? Can the joint be left open?
I just had a conversation with our surveyor. He said to remove the dimpled membrane and then install perimeter insulation. The perimeter insulation is supposed to prevent anything from falling in during masonry work, which could cause contact between the floor slabs. My main contractor replied that the fiberglass insulation will be placed against the neighboring wall before our masonry work starts, so nothing can fall in. Is that sufficient?
P
perlenmann12 Jul 2011 15:30Well, that is part of the package from the building inspection authority included in the house price. He was not on site because of the foundation slab. I only explained it to him over the phone.
At least now my site manager is getting in touch with him. Let’s see what they decide.
At least now my site manager is getting in touch with him. Let’s see what they decide.
P
perlenmann13 Jul 2011 14:06Oops, yesterday evening you already raised the walls to 1m (3 feet) high, and now the wall next to the neighbor is gone again. Now a 3cm (1.2 inch) wide gap is being created and filled with perimeter insulation. According to the architect and the building inspector, this should be correct, so it should be fine, right?
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