Roof screeds laid to falls are essential for a flat roof to function correctly, ensuring the drainage of rainwater, and in preventing the accumulation of ponding water and its infiltration into the building enhancing the durability of roof waterproof and insulation layers.
A roof screed laid to falls, also called screed to falls, is a variable thickness screed that is laid on top of roof slab to give it the correct slope gradient for rainwater to be carried from the roof of the building towards rainwater outlet and downpipes or guttering systems, hoppers etc. It can serve as a support for waterproofing, insulation, or paving.
Flat roof falls made with lightweight insulating screed
Often, mortar and concrete layers used to create these falls on flat roofs impose an unnecessary additional dead load, as they are supported by the structure without providing any technical, thermal, or structural advantage.
As an alternative, lightweight and insulating concretes and mortars based on Laterlite Expanded Clay LWA from the Latermix range (Fast, Facile, Cem Mini, Cem Classic) can be used to create very lightweight, extremely strong, stable, durable insulating roof screed to falls, significantly reducing dead loads, being between 50 and 70% lighter than solutions based on conventional aggregates.
Depending on the minimum and maximum thickness of the screed and on the live loads to be considered, the most suitable product or combination of products can be defined for each project.
Lightweight roof screeds to fall can be useful in any site or project but are particularly convenient and often necessary in renovation works.
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