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I would like to pour a slab of terrace on an existing slab of terrace but with an inverted slope towards the house. How should I proceed so that the two slabs are solidary? (I would like to avoid having to break the existing slab).

So that the two slabs are solidary, after complete cleaning, you will have to carry out scarifications (rifling) on the first slab to allow better grip. You can also apply a special concrete primer or incorporate a specific additive into the concrete that you are going to sink. You can also spread pure powdered cement directly on the slab (bricklayer's tip). You can then proceed normally and create your second slab without worry.

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