Refurbishment solutions 2018-04-03T09:17:20+00:00

Refurbishment solutions

Find the best refurbishment solution according to your needs by selecting the specificities of your building and technologies you are interested in, or simply explore our collection of refurbishment packages.

Embedded Technologies

Envelope

HVAC

Renewables

Energy management

Building Characteristics

Building type

Type of ownership

Climate

Age Class

E2VENT: Energy Efficient Ventilated Façades

The E2VENT system directly targets a special typology that correspond to suburban multi-storey residential buildings built in the 60’s 70’s that are characterized by a high energy consumption, bad air quality due to the lack of air renewal motorized system, and with low architectural interest. To tackle all those problems with one refurbishment strategy, E2VENT offers an innovative yet simple modular and adaptable system.

The E2VENT system is an external thermal building refurbishment solution with external cladding and air cavity that embeds different breakthrough technologies that will ensure its high efficiency:

  • A Smart Modular Heat Recovery Ventilation (SMHRV) for the air renewal allows the heat recovery from the extracted air using a double flux exchanger. Indoor Air Quality is ensured while limiting the energy losses.
  • A Latent Heat Thermal Energy Storage (LHTES) based on phase change materials provides a heat storage system for heating and cooling peak saving.
  • A smart management that controls the system on a real time basis targeting optimal performances
  • An efficient anchoring system that limits thermal bridges and allows an easy and durable installation.

View of ventilated facade element. Source: E2VENT

View of SMHRV. Source: E2VENT

View of LHTES. Source: E2VENT

View of the two systems installed. Source: E2VENT

To know more: http://systems.e2vent.eu/

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!

Standard envelope insulation – ‘deep’, with ETICS

This package provides a comprehensive thermal insulation of a building and includes the following components:

  • Roof insulation, using either an insulation panel/roll or a spray foam under the roof. External roof insulation is also possible (i.e. built-up roof insulation under waterproofing)
  • Energy efficient windows (double or triple glazing)
  • Floor insulation
  • Wall insulation, in this case with an External Thermal Insulation Composite System (ETICS)

 

Roof / loft insulation

Materials

Different types of materials can be used for internal and external insulation, either in a roll, panel or spray foam form, each having its own benefits and limitations: wool (glass, rock, sheep or hemp), polyurethane, expanded polystyrene (EPS) or extruded polystyrene (XPS).  The recommended uses are the following:

Techniques

There are two main ways to insulate a loft or a roof: at the joists or at the rafters.

Insulation at the joists (Source: ADEME)

 

Cold loft insulation at the joists

The insulating material is laid (or sprayed) on the floor of the cold loft.

 

Warm loft insulation at rafter or externally

For the insulation of warm and occupied lofts under a pitched roof, two techniques are available:

Internal insulation

The internal insulation can be done with semi-rigid panels or rolls, whose layout will depend on the structure of the building frame and the available space. A loose-fill insulation can also be injected in an air-tight cavity under the roof cover.

Loose fill insulation (Source: ADEME)

Insulation at the rafters with panels (Source: ADEME)

External insulation

Insulating from the outside avoid loosing living space but requires to remove the existing covering. Load-bearing panels can be used, or insulation can be added between the rafters and the roof covering, with a roof sarking (i.e. a protective and waterproof second skin under the roof). This last solution requires raising the roof line.

 

Flat roofs insulation

For flat roof, external insulation (“hot roof”) is recommended. Insulating from the inside can cause damage as it will inevitably lead to the formation of condensation. In this case, a rigid insulation is fitted outside, above the existing weatherproofing. This is then covered with a further weatherproofing layer.

 

External wall insulation

External insulation allows to insulate and restore the façade at the same time. Thermal bridges are usually easier to address this way, and the living are is not reduced as in the case of internal insulation. It also reduces the disturbance to the occupants. However this technique is usually more costly than internal insulation, and may require a building permit.Thermal bridges around the balconies should also be carefully addressed.

Techniques

External Thermal Insulation Systems (ETICS) can be applied in two ways:

External wall protected by coating (Source: ADEME)

External wall insulation protected by cladding (Source: ADEME)

  • insulating materials (glued or screwed to the wall) protected by coating
  • Insulating materials protected by cladding. In that case the insulating panels are installed on a frame fixed to the wall. An air gap is maintained between the external cladding and the insulation

The application of ETICS ensures a continuous thermally insulated envelope, however the big number (~10/m²) of fasteners crossing the insulation (if this technique is used) can raise an issue of thermal bridging, unless thermally decoupled fasteners are used.

 

Reduction of thermal bridges in concrete balconies

The slab acts as thermal bridge, which results in heat losses and potential formation of condensation and mould. The balcony can be cut-out to remove this bridge. The slab can be partially cut – in which case thermal breaks are inserted between the balcony and the wall, or completely cut which requires the creation of a self-bearing structure.

 

Energy-efficient windows

Materials

The performance of the windows depends on the glazing and the frame. The level of performance is expressed by the thermal transmittance coefficient Uw. Performant solutions exist with timber, PVC or aluminium (with thermal breaks) frames.

Double glazing

Double glazing is made of two glass layers separated by an air gap. It is more performant than simple glazing and reduces the condensation and heat losses through the windows. The new generation of double glazing includes argon instead of air, as well as a fine transparent layer with low emissivity, usually silver-based: its insulating capacity is 2 to 3 times that of standard double glazing.

Triple glazing

Triple-glazing is made of three layers of glass separated by two layers of argon or krypton and two low-emissivity metallic layers. The Uw value is excellent, however the ligh transmittance can be lower than for a good double-glazing.

 

Techniques

Windows can be changed with two main techniques:

  • By keeping the existing frame: this a simplest option, however the performance and the glazed area are slightly reduced
  • By removing the existing frame: this is the most performant option, however it requires more work and some finishing

As double or triple-glazed windows will be more airtight than the original single-glazed frames, condensation can build up in the building due to the reduced ventilation. If there is not a sufficient level of background ventilation in the room, replacement windows should therefore have trickle vents incorporated into the frame, that let in a small amount of controlled ventilation.

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!

Standard envelope insulation – ‘light’

This package consists in the very first step of the thermal insulation of a building and includes the following components:

  • Roof insulation, using either an insulation panel/roll or a spray foam under the roof. External roof insulation is also possible (i.e. built-up roof insulation under waterproofing)
  • Energy efficient windows (double or triple glazing)

 

Without proper insulation, as much as 25 to 30% of the heat in an uninsulated house is lost through the roof, and 10 to 15% through the window. Those two points are usually addressed first (i.e. before the walls – 25 to 35% of losses, and the floor – 10 to 15% of losses) as they are the most easy to deal with and the  most profitable in the short term.  Loft insulation and new windows act as a barrier, slowing the movement of heat out of the building during the winter and into it during the summer.

On its own,this package will not increase the performance of a building sufficiently for this building to become energy-efficient, but it can be complemented at a later stage with additional technologies so as to generate more substantial energy savings.

 

Roof / loft insulation

Materials

Different types of materials can be used for internal and external insulation, either in a roll, panel or spray foam form, each having its own benefits and limitations: wool (glass, rock, sheep or hemp), polyurethane, expanded polystyrene (EPS) or extruded polystyrene (XPS).  The recommended uses are the following:

Techniques

There are two main ways to insulate a loft or a roof: at the joists or at the rafters.

Insulation at the joists (Source: ADEME)

Cold loft insulation at the joists

The insulating material is laid (or sprayed) on the floor of the cold loft.

 

Warm loft insulation at rafter or externally

For the insulation of warm and occupied lofts under a pitched roof, two techniques are available:

Internal insulation

Insulation at the rafters with panels (Source: ADEME)

Loose fill insulation (Source: ADEME)

The internal insulation can be done with semi-rigid panels or rolls, whose layout will depend on the structure of the building frame and the available space.

A loose-fill insulation can also be injected in an air-tight cavity under the roof cover.

External insulation

Insulating from the outside avoid loosing living space but requires to remove the existing covering. Load-bearing panels can be used, or insulation can be added between the rafters and the roof covering, with a roof sarking (i.e. a protective and waterproof second skin under the roof). This last solution requires raising the roof line.

 

Flat roofs insulation

For flat roof, external insulation (“hot roof”) is recommended. Insulating from the inside can cause damage as it will inevitably lead to the formation of condensation. In this case, a rigid insulation is fitted outside, above the existing weatherproofing. This is then covered with a further weatherproofing layer.

 

Energy-efficient windows

Materials

The performance of the windows depends on the glazing and the frame. The level of performance is expressed by the thermal transmittance coefficient Uw. Performant solutions exist with timber, PVC or aluminium (with thermal breaks) frames.

Double glazing

Double glazing is made of two glass layers separated by an air gap. It is more performant than simple glazing and reduces the condensation and heat losses through the windows. The new generation of double glazing includes argon instead of air, as well as a fine transparent layer with low emissivity, usually silver-based: its insulating capacity is 2 to 3 times that of standard double glazing.

Triple glazing

Triple-glazing is made of three layers of glass separated by two layers of argon or krypton and two low-emissivity metallic layers. The Uw value is excellent, however the ligh transmittance can be lower than for a good double-glazing.

 

Techniques

Windows can be changed with two main techniques:

  • By keeping the existing frame: this a simplest option, however the performance and the glazed area are slightly reduced
  • By removing the existing frame: this is the most performant option, however it requires more work and some finishing

As double or triple-glazed windows will be more airtight than the original single-glazed frames, condensation can build up in the building due to the reduced ventilation. If there is not a sufficient level of background ventilation in the room, replacement windows should therefore have trickle vents incorporated into the frame, that let in a small amount of controlled ventilation.

 

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!

iNSPiRe Kit – Energy Hub

The Energy Hub (EH) is a multi-functional hydronic modular unit, which:

  • connects different components of a building’s heating and cooling system (heat pump, solar collectors, geothermal probes, oil/gas/pellet boiler radiant ceilings/floor/wall, radiators, fan-coils);
  • performs low cost measurement of the thermal and electric energy flows in the heating and cooling system;
  • manages and optimizes the heating and cooling system; incorporates “continuous commissioning” procedures to increase the reliability of the heating and cooling system.

 

The Energy Hub offers flexibility, since different modules can be derived from a common initial configuration. The different modules that can be obtained can be used, for example to provide domestic hot water (DHW), control the flow at the solar collectors (Solar), regulate the supply temperature of the water, provide recirculation of the water in the distribution lines (pumping), provide space heating and cooling (SHC) and to implement parallel or series connection of components.

The Energy Hub modules are coordinated by a central unit called Energy Manager. The Energy Manager is responsible for data acquisition, real-time control, system supervision and human-machine interaction.

 

All the components in this network are generally “off the shelf” components, therefore familiar to trained installers. All the EH are essentially hydronic components that should be managed on-site by plumbers and electricians with some experience of automation system or by a trained installer with the two expertise.

Energy Hub, Energy Management and Energy Managemet Network. Source: iNSPiRe

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!

iNSPiRe Kit – Wooden frame envelope module incorporating ducts and air-to-air heat pump

This package, developed in the framework of the iNSPiRe project (funded by the European Community’s Seventh Framework Programme), includes:

  • A prefabricated timber façade with windows
  • A micro Heat Pump
  • A mechanical ventilation system with heat recovery (MHVR)

The prefabricated timber framed façade elements comprise timber, cellulose insulation, OSB (Oriented Strand Board), timber soft fibre board and different sorts of cladding. Windows, shading or other elements can also be prefabricated.

The prefabrication enables the industrialisation of the manufacturing process, and reduce the duration of on-site works.

The prefabricated façade is combined with a system which delivers a MVHR (mechanical ventilation with heat recovery), minimising where possible the installation of ducts inside the dwelling that remains occupied during the retrofit.

Parts of the ventilation system installed in the wall during prefabrication (Source inspirefp7.eu Credits Gumpp & Maier GmbH)

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!

Prefabricated façade with integrated heat pump and PV panels or solar thermal collector

This package includes:

  • a prefabricated timber façade
  • a heat pump for centralised heating
  • photovoltaic panels or solar thermal collectors

Prefabricated timber framed façade elements are used for the external thermal insulation of walls. The prefabrication enables the industrialisation of the manufacturing process, and reduce the duration of on-site works. The system also integrates windows and HVAC devices. In this refurbishment package, the prefabricated façade is combined with a heat pump that provides space heating and domestic hot water, and with a ventilation with heat recovery.

Photovolaic panels or solar thermal collector are also installed on the roof.

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!

Photovoltaic installation

The solutions consists in the installation of photovoltaic (PV) panels on the building roof or on the façade. This installation can be of several types:

  • Roof-mounted PV installation
  • Building-integrated PV:
    • on the roof (replacing tiles or skylights)
    • integrated to the façade (warm or cold facades)
    • integrated to the balconies
  • Sun-shading elements (e.g. sunscreen, semi-transparent shading for patios or rooftop gardens)

Cost Benefit Indicators

No Cost-Benefit Indicator is available today in our database for the selected building characteristics. Please try another selection, or register to the STUNNING community and contribute to the database with your own case!