Data Sheet:
Internal Wall Insulation - Flexible Solution Data Sheet
- Information suitable for:
- Retrofit
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Technical information
The Knauf ThermoShell Internal Wall Insulation System is used to upgrade an existing solid external wall bringing it back in line with today’s thermal standards. The system consists of thermally engineered insulated studs called EcoStuds and water repellent glass mineral wool insulation slabs called EcoBatts. To achieve a good U-value with the minimum intrusion into the room use the 95mm EcoStuds infilled with 95mm EcoBatts with a layer of Knauf vapour shield plasterboard. This will achieve a typical U-value of 0.30 W/m²K.
Around external door and window reveals install 27mm Knauf Thermal Laminate Plus to reduce the thermal bridging at this junction without reducing the size of the window frames too much.
Where internal and party walls run perpendicular to the external walls the insulation should be taken back a minimum of 600mm in order to reduce the effect of thermal bridging that occurs at these junctions. This is also the case in floor voids, both on the ground floor (where it is a timber joist construction) and all intermediate floors. The floor voids should be completely filled a minimum of 600mm back from the external wall.
Ensure any air bricks or mechanical ventilation is carried forward through the new insulation and any new ventilation required to meet current Building Regulation is installed.
The Knauf ThermoShell Internal Wall Insulation System is used to upgrade an existing solid external wall bringing it back in line with today’s thermal standards. The system consists of thermally engineered insulated studs called EcoStuds and water repellent glass mineral wool insulation slabs called EcoBatts. To achieve a good U-value with the minimum intrusion into the room use the 95mm EcoStuds infilled with 95mm EcoBatts with a layer of Knauf vapour shield plasterboard. This will achieve a typical U-value of 0.30 W/m²K.
Around external door and window reveals install 27mm Knauf Thermal Laminate Plus to reduce the thermal bridging at this junction without reducing the size of the window frames too much.
Where internal and party walls run perpendicular to the external walls the insulation should be taken back a minimum of 600mm in order to reduce the effect of thermal bridging that occurs at these junctions. This is also the case in floor voids, both on the ground floor (where it is a timber joist construction) and all intermediate floors. The floor voids should be completely filled a minimum of 600mm back from the external wall.
Ensure any air bricks or mechanical ventilation is carried forward through the new insulation and any new ventilation required to meet current Building Regulation is installed.
Hints and Tips
Ensure the walls to be retrofitted are sound proof and any possible damp problems are investigated and rectified.
Using mineral wool instead of rigid insulation improves the acoustic ability of the wall.
Remove existing plaster finish to reduce the impact on the footprint of the room.
Ensure all joints are butted together with no gaps.
When insulating the return on an internal or party wall think about using a thermal laminate to reduce the step that is formed.
If there is a chimney breast on the internal or party wall then continue the insulation return to the chimney so there is no step.
All work should be undertaken by an accredited installer.
Due to the fact that you are required to insulate the floor voids to a minimum of 600mm back from the external wall, it could be the perfect opportunity to insulate all of the floor voids.