References ⁄ Renovation of a building housing three families in Penzberg (D)
From uninsulated old building to low energy standard

A permanent reduction in energy costs and a long-term increase in the value of the property – those were the aims behind the energy-saving renovation of a building housing three families on the Starnberger lake. The building's practically uninsulated roof and wall constructions required the erection of a high-performance, multifunctional building envelope which was put into place quickly, efficiently and economically using PAVATEX roof and wall renovation solutions. The result: heating costs more than halved, a harmonious, pleasant living environment throughout the entire building and the long-term protection of the building and its residents against cold, heat and noise nuisance thanks to a modern building envelope which complies with current low energy standards for new constructions.

The permanent reduction of energy costs coupled with the long-term increase in the value of the property were the main reasons for the energy-conserving renovation of a building housing three families on the Starnberger lake. The building is a typical construction from the 1960s which, despite possessing good structural integrity, suffers from inadequate insulation. Like many old buildings requiring renovation, much of the energy devoted to heating had been leaking unused to the outside for decades. This made the energy-saving renovation of the building envelope an absolute necessity for both economic and ecological reasons. "This energy-conserving renovation had been planned for a long time and has now been performed in the light of the constant increase in energy costs," explains the owner Martin Hermann. "The aim is to achieve a significant reduction in energy consumption by creating a multifunctional building envelope which provides the maximum possible wall and roof protection against heat, cold and noise." To make the renovation work as fast, simple and economical as possible, the owner opted for the PAVATEX renovation solutions for roofs, walls and floors. Using the high-performance PAVATEX fiberboards the building was quickly and easily upgraded to meet the latest energy requirements, while the board's excellent insulating properties reduce energy consumption to a minimum.

Roof renovation from the outside

The energy-conserving renovation of the building started in the roof area which contains the attic apartment which was built in the early 1970s and is still occupied today. "To preserve the present, intact internal wood cladding and keep disturbance to the occupants to a minimum during the building operations, our only option was to perform the renovation from the outside," explains builder Stefan Goldbrunner from the Goldbrunner firm of carpenters. "We used a PAVATEX renovation solution which makes it possible to perform roof renovations from the outside. This solution, which in this case was applied to an area of approximately 150 square meters guarantees optimum insulation and consequently the long-term reduction of energy costs." The chosen PAVATEX renovation system consists of a combination of PAVATHERM-PLUS+ fiber insulation boards and the PAVATEX LDB 0.02 airtight layer. First of all, the existing roof construction consisting of lightweight building panels with a heat transfer coefficient of approximately 2.0 W/m²K were removed and replaced by 100-millimeter thick PAVATHERM-PLUS+ fiberboards. Below these, the PAVATEX LDB 0.02 airtight layer ensures the permanent protection of the roof truss, while its permeable structure improves the transport of moisture throughout the building. The roof now possesses a heat transfer coefficient of 0.2 W/m²K and therefore complies with the low energy standards required for new buildings. The special bonus: The fact that the two system components can simply be laid flat over the rafters means that installation is extremely fast, thus saving a enormous amount of time and money. In this way, the renovation of the roof area in the Penzberg house could be performed quickly and unproblematically: Barely three weeks after the start of the work, it was possible to lay the roof tiles on the structure.

Step-by-step insulation of the façade

The PAVATEX renovation solution for external walls was used for the building's façade areas. This consists of PAVATEX DIFFUTHERM which is mounted on a timber frame construction infilled with PAVAFLEX. The first step was to mount the timber frames across the entire façade of the external wall which consisted of vertically perforated bricks and had a heat transfer ratio of approximately 1.5 W/m²K before renovation. The gaps in the wooden construction were then filled with a 120-millimeter thickness of PAVAFLEX, PAVATEX's flexible wood fiber insulating material. This high-performance insulating material is ideally suited for use with the PAVATEX insulating systems and was specially developed for insulating between timber frames and rafters. Thanks to its flexibility and the grip this provides, PAVAFLEX can be mounted between construction elements quickly, easily and without joins. The construction is completed by 60-millimeter thick PAVATEX DIFFUTHERM fiberboards which are mounted directly on the wooden frame. PAVATEX DIFFUTHERM consists of multiple layers of different thicknesses which are sandwiched together to form a permeable board with excellent heat insulating properties. This wood fiber-based integrated thermal insulation system for rendered external walls is characterized by a low heat transfer coefficient and a high heat storage capacity. On the one hand, this ensures optimum protection against both the cold and the heat of the summer while, on the other, PAVATEX DIFFUTHERM also absorbs disruptive noise. PAVATEX DIFFUTHERM's permeable, breathable structure ensures the excellent transport of moisture throughout the external wall. This also means that the wall's equilibrium humidity can stabilize over time without any risk of mold forming. This ensures a comfortable, harmonious living environment throughout the entire building.

Building envelope that meets new construction standards

Since the PAVATEX DIFFUTHERM fiberboards also act as cement boards, there is no longer any need for an additional formwork layer. "The advantage of the PAVATEX renovation solution for external walls lies in the fact that the façade lining can be insulated in a particularly simple, fast and economical way," says Stefan Goldbrunner. "At the same time, it is also possible to quickly and reliably even out the rough areas in the façade that are always present in older buildings." Outside, the construction work is finished off below the paintwork by two render layers of a total thickness of 10 millimeters which are applied directly to the PAVATEX DIFFUTHERM boards. Thanks to the PAVATEX renovation solution, the complete 240 square meter façade of this residential building now has a heat transfer coefficient of approximately 0.2 W/m²K.

Benefits for the building, its occupants and the environment

"In less than a month, this practically uninsulated building was transformed to comply with the most recent energy standards using the PAVATEX system solution," explains Lothar Zieglmeier, PAVATEX's Regional Sales Manager. "For the occupants, this means that their energy costs are more than halved and, what is more, that the value of their property will rise in the long term because it is now securely and permanently protected by the building envelope." This project illustrates just how quick and easy it is to renovate even older buildings to provide greater energy efficiency using PAVATEX system solutions. The tried and trusted designs of PAVATEX insulation materials which have proven their value millions of times in practice offer clients and builders alike the greatest possible level of confidence. Thanks to them, any building can be given a high-performance, multifunctional building envelope very quickly. And the house and occupants are not the only ones to benefit – so, too, does the environment. Because as natural materials, PAVATEX wood fiber insulating systems improve the CO2 balance not only because of the amount of carbon bound up in the system but also because of the reduced energy consumption in the building.

From uninsulated old building to low energy standard

A permanent reduction in energy costs and a long-term increase in the value of the property – those were the aims behind the energy-saving renovation of a building housing three families on the Starnberger lake. The building's practically uninsulated roof and wall constructions required the erection of a high-performance, multifunctional building envelope which was put into place quickly, efficiently and economically using PAVATEX roof and wall renovation solutions. The result: heating costs more than halved, a harmonious, pleasant living environment throughout the entire building and the long-term protection of the building and its residents against cold, heat and noise nuisance thanks to a modern building envelope which complies with current low energy standards for new constructions.

The permanent reduction of energy costs coupled with the long-term increase in the value of the property were the main reasons for the energy-conserving renovation of a building housing three families on the Starnberger lake. The building is a typical construction from the 1960s which, despite possessing good structural integrity, suffers from inadequate insulation. Like many old buildings requiring renovation, much of the energy devoted to heating had been leaking unused to the outside for decades. This made the energy-saving renovation of the building envelope an absolute necessity for both economic and ecological reasons. "This energy-conserving renovation had been planned for a long time and has now been performed in the light of the constant increase in energy costs," explains the owner Martin Hermann. "The aim is to achieve a significant reduction in energy consumption by creating a multifunctional building envelope which provides the maximum possible wall and roof protection against heat, cold and noise." To make the renovation work as fast, simple and economical as possible, the owner opted for the PAVATEX renovation solutions for roofs, walls and floors. Using the high-performance PAVATEX fiberboards the building was quickly and easily upgraded to meet the latest energy requirements, while the board's excellent insulating properties reduce energy consumption to a minimum.

Roof renovation from the outside

The energy-conserving renovation of the building started in the roof area which contains the attic apartment which was built in the early 1970s and is still occupied today. "To preserve the present, intact internal wood cladding and keep disturbance to the occupants to a minimum during the building operations, our only option was to perform the renovation from the outside," explains builder Stefan Goldbrunner from the Goldbrunner firm of carpenters. "We used a PAVATEX renovation solution which makes it possible to perform roof renovations from the outside. This solution, which in this case was applied to an area of approximately 150 square meters guarantees optimum insulation and consequently the long-term reduction of energy costs." The chosen PAVATEX renovation system consists of a combination of PAVATHERM-PLUS+ fiber insulation boards and the PAVATEX LDB 0.02 airtight layer. First of all, the existing roof construction consisting of lightweight building panels with a heat transfer coefficient of approximately 2.0 W/m²K were removed and replaced by 100-millimeter thick PAVATHERM-PLUS+ fiberboards. Below these, the PAVATEX LDB 0.02 airtight layer ensures the permanent protection of the roof truss, while its permeable structure improves the transport of moisture throughout the building. The roof now possesses a heat transfer coefficient of 0.2 W/m²K and therefore complies with the low energy standards required for new buildings. The special bonus: The fact that the two system components can simply be laid flat over the rafters means that installation is extremely fast, thus saving a enormous amount of time and money. In this way, the renovation of the roof area in the Penzberg house could be performed quickly and unproblematically: Barely three weeks after the start of the work, it was possible to lay the roof tiles on the structure.

Step-by-step insulation of the façade

The PAVATEX renovation solution for external walls was used for the building's façade areas. This consists of PAVATEX DIFFUTHERM which is mounted on a timber frame construction infilled with PAVAFLEX. The first step was to mount the timber frames across the entire façade of the external wall which consisted of vertically perforated bricks and had a heat transfer ratio of approximately 1.5 W/m²K before renovation. The gaps in the wooden construction were then filled with a 120-millimeter thickness of PAVAFLEX, PAVATEX's flexible wood fiber insulating material. This high-performance insulating material is ideally suited for use with the PAVATEX insulating systems and was specially developed for insulating between timber frames and rafters. Thanks to its flexibility and the grip this provides, PAVAFLEX can be mounted between construction elements quickly, easily and without joins. The construction is completed by 60-millimeter thick PAVATEX DIFFUTHERM fiberboards which are mounted directly on the wooden frame. PAVATEX DIFFUTHERM consists of multiple layers of different thicknesses which are sandwiched together to form a permeable board with excellent heat insulating properties. This wood fiber-based integrated thermal insulation system for rendered external walls is characterized by a low heat transfer coefficient and a high heat storage capacity. On the one hand, this ensures optimum protection against both the cold and the heat of the summer while, on the other, PAVATEX DIFFUTHERM also absorbs disruptive noise. PAVATEX DIFFUTHERM's permeable, breathable structure ensures the excellent transport of moisture throughout the external wall. This also means that the wall's equilibrium humidity can stabilize over time without any risk of mold forming. This ensures a comfortable, harmonious living environment throughout the entire building.

Building envelope that meets new construction standards

Since the PAVATEX DIFFUTHERM fiberboards also act as cement boards, there is no longer any need for an additional formwork layer. "The advantage of the PAVATEX renovation solution for external walls lies in the fact that the façade lining can be insulated in a particularly simple, fast and economical way," says Stefan Goldbrunner. "At the same time, it is also possible to quickly and reliably even out the rough areas in the façade that are always present in older buildings." Outside, the construction work is finished off below the paintwork by two render layers of a total thickness of 10 millimeters which are applied directly to the PAVATEX DIFFUTHERM boards. Thanks to the PAVATEX renovation solution, the complete 240 square meter façade of this residential building now has a heat transfer coefficient of approximately 0.2 W/m²K.

Benefits for the building, its occupants and the environment

"In less than a month, this practically uninsulated building was transformed to comply with the most recent energy standards using the PAVATEX system solution," explains Lothar Zieglmeier, PAVATEX's Regional Sales Manager. "For the occupants, this means that their energy costs are more than halved and, what is more, that the value of their property will rise in the long term because it is now securely and permanently protected by the building envelope." This project illustrates just how quick and easy it is to renovate even older buildings to provide greater energy efficiency using PAVATEX system solutions. The tried and trusted designs of PAVATEX insulation materials which have proven their value millions of times in practice offer clients and builders alike the greatest possible level of confidence. Thanks to them, any building can be given a high-performance, multifunctional building envelope very quickly. And the house and occupants are not the only ones to benefit – so, too, does the environment. Because as natural materials, PAVATEX wood fiber insulating systems improve the CO2 balance not only because of the amount of carbon bound up in the system but also because of the reduced energy consumption in the building.