WATERPROOFING TERRACES AND BALCONIES - Mapei

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Floating screeds
They are comparable to isolated screeds, but are laid on a layer of
soundproofing or insulating material (e.g. cork, polythene mattress,
sheets of expanded polyurethane, etc.). In these cases, because of
the high compressibility and low mechanical strength of the substrate,
the size of the screed must be calculated accordingly and electro-
welded reinforcement mesh must be inserted at the mid-point of the
screed to encourage even load distribution and to avoid punching.
Table 1 indicates the thickness and reinforcement of screeds for residential
use according to the compressibility and thickness of the isolating layer.
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Fig. 3.6 - Floating screed.
1) Floor slab; 2) Insulating/soundproofing material;
3) Polyethylene sheet; 4) Screed with thickness > 4 cm
with electro-welded mesh; 5) Compressible material.
THICKNESS
OF SCREED
REINFORCEMENT
I: Thickness 0,5 mm e ≤ 3mm 4 cm 50x50 mm mesh, ø = 2 mm
5 cm Including non-reinforced
III: Crushing* >3 mm e