Insulating the space below a pitched roof minimises thermal dispersion and improves winter and summer thermal comfort in the spaces below.
Laterlite Expanded Clay or Laterlite Plus natural insulation is traditionally used for this purpose because:
INSULATION AND THERMAL MASS
Laterlite Expanded Clay is effective as thermal insulation because of its low conductivity ? (lambda). Being denser than traditional insulating materials, it increases the thermal mass and the thermal inertia of a roof and attenuates summer overheating in the spaces below (better thermal lag, temperature damping, and periodic thermal transmittance). This is particularly beneficial in the case of roofs of timber, steel, or other lightweight construction. Laterlite Expanded Clay is also a very vapour open insulation, in other words, it’s breathable.
RESISTANCE TO FIRE
Expanded clay insulation is totally mineral and incombustible (Euroclass A1), resistant to high temperatures, and can safely be placed in direct contact with chimneys.
As a refractory material it is also commonly used for insulating the chimneys themselves and for manufacturing precast components exposed to high temperatures (chimneys, fireplaces, ovens, etc).
EASE OF USE
Laterlite and Laterlite Plus Expanded Clay can be laid and levelled to the desired thickness without requiring any treatment to the top surface. If the top surface is to take foot traffic it can be covered by panels (wood, fibre cement, gypsum fibre etc.) or bound with a cement or lime slurry.
To meet particular requirements the insulating layer can be made from pervious ultra-lightweight premixed concretes (Latermix Cem Classic) or by mixing the whole layer of expanded clay with cement or lime.
USE IN COMBINATION WITH OTHER INSULATING MATERIALS
Laterlite Expanded Clay can also be used in association with other insulating materials:
Prior to implementation, the airtightness and load-bearing capacity of the supporting slab should be assessed, taking into account the additional weight of the new insulating layer.