Aktarus Group

How to use our products

How to use our products - Aerogel

EXTERNAL FACADE RESTRUCTURING OF A BUILDING WITH HISTORIC AND ARCHITECTURAL VALUE.

Nanotechnology enables energy savings and preservation of historical buildings as can be seen by this restructured building of architectural importance.

New materials which are the result of nanotechnology, combined with natural products used on recent energy redevelopment work carried out on a historic villa where it was necessary to preserve the external facade’s particular architectural features while at the same time applying insulating material that is highly breathable.

The solution was found by creating a special insulating package which consists of naturally seasoned slaked lime, without chemical additives and cement, flexible aerosol insulating felt and water-based translucent insulating paint.

Objective of the work carried out
The building originally had a simple wall layer which consisted of: 10mm of lime plaster, a solid brick 250 mm thick, and another 10 mm of lime plaster. Upon completion of the work the wall’s layers are more complex and more solid: it is made up of a 10 mm layer of Natural Calk lime plaster, 9 mm of Spaceloft® Aerogel insulating felt and the section’s 250 mm solid brick. Internally there are 50 mm of insulating plaster along with a mixture of lime, cork and sand, and then 4 mm of Natural Calk as an internal finish (putty-based coating).

The objective, which was fully achieved, was to restructure the building’s shell in order to reduce by more than 50 % the building’s walls heat losses, while retaining the building’s external architectural features using eco-friendly products combined with innovative material. The work was carried out using traditional working techniques.

Natural and Technological material
The lime’s main feature is to facilitate the wall’s permeability. It uses carbon dioxide, which is present in air, for aging (carbonation) and it partially reflects heat which it receives for radiation.

The Spaceloft® Aerogel flexible felt is certainly highly technological. It has a very low thermal conductibility, equal to 0,014 W/mK and it is breathable even with water vapor but at the same time it is water repellent. Furthermore it is recyclable and has a very low “environmental cost” with good thermal conductive stability even after 60 years as has been demonstrated by aging tests.

The internal thermo-insulating plaster used for this sort of work is made up of lime, cork and sand. It ensures added thermal insulation and it functions as heat storage as a result of the sand component which is in the mix. Greater mass found inside the inner walls ensures better living comfort.

Finally, the Nansulate® translucent insulating paint is unique because of its low thermal conductibility of only 0,017 W/mK. This varnish allowed application of a thin insulating layer where it was previously impossible to apply full insulation, for example in the eaves and in the difficult areas of the external facade.

 

Prior to the redevelopment work

  • Full brick thermal conductibility: 070 W/mK
  • Lime plaster thermal conductibility: 0,08 W/mK
  • 250mm full brick thermal resistance: 0,3571 m2K/W
  • 10 mm lime Plaster thermal resistance: 0,0125 M2k/w
  • External liminal resistance: 0,04 m2K/W
  • Internal liminal resistance: 0,13 m2K/W
  • Rparete = 0,04 + 0,0125 + 0,3571 + 0,0125 + 0,13 = 0,5521 m2K/W
  • Uparete = 1/Rparete = 1/0,5521 = 1,8112 W/ m2K
  • Rparete = external liminal resistance + external plaster resistance + full brick resistance + internal plaster resistance + internal liminal resistance

After the redevelopment work

  • Full brick thermal conductibility: 0,70W/mK
  • Lime plaster thermal conductibility:: 0,08 W/mK
  • Aktarus Aerogel Spaceloft thermal conductibility: 0,014 W/mK
  • Lime-sand-cork thermo plaster thermal conductibility: 0,46 W/mK
  • 250 mm full brick thermal resistance: 0,3571 m2K/W
  • 10 mm lime Plaster thermal resistance: 0,0125 M2k/w
  • 4 mm lime plaster thermal resistance: 0,005 m2K/W
  • Lime-cork-sand thermo insulating plaster thermal resistance: 0,1086 m2 K/W
  • External liminal resistance: 0,04 m2K/W
  • Internal liminal resistance: 0,13 m2K/W
  • Rparete = 0,04 + 0,0125 + 0,6428 + 0,3571 + 0,1086 + 0,005 + 0,13 = 1,296 m2K/W
  • Uparete = 1/Rparete = 1/1,296 = 0,7716 W/ m2K
  • Rparete = external liminal resistance + external plaster resistance + Aktarus Aerogel Spaceloft felt resistance + full brick resistance + internal plaster-cork-sand thermo insulating plaster resistance + finishing plaster resistance + internal liminal resistance

 

BEFORE AND AFTER

Before carrying out the work

  • Rparete 0,5521 m2 K/W
  • Uparete 1,8112 m2 K/W

After the redevelopment work

  • Rparete 1,296 m2 K/W
  • Uparete 0,7716 m2 K/W