Data Sheet:
External Wall Insulation - Rigid Solution Data Sheet
- Information suitable for:
- Retrofit
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Technical information
To achieve a good external wall U-Value affix 55mm Kingspan K5 Insulation to the external face of the wall using Rawlplug Fixings 80mm long through mesh, typically using 5 fixings per board with edge fixings at a maximum of 300mm centres. Apply render to the mesh and insulation in 2 coats.
Before fixing the insulation remove all loose and flaking materials from the wall, making areas smooth, stable substrate.
Around window openings, cut insulation at an angle to allow as much light as possible to enter the rooms.
Around reveals, sills and heads, affix 30mm Kingspan K5 insulation behind the mesh and continue render around to meet window and door frames. This will avoid any potential thermal bridges. Use angle beads to achieve clean straight corners.
Insulation boards should be taken down to DPC level with the DPC continuing underneath the insulation then Knauf Polyfoam High Impact board should be installed to 200mm below the top of the internal floor insulation.
Ensure any air bricks or mechanical ventilation is carried forward through the new insulation and any new ventilation required to comply with current Building Regulations.
Ensure all pipes and cylinder jackets are insulated, as this can lead to heat loss.
To achieve a good external wall U-Value affix 55mm Kingspan K5 Insulation to the external face of the wall using Rawlplug Fixings 80mm long through mesh, typically using 5 fixings per board with edge fixings at a maximum of 300mm centres. Apply render to the mesh and insulation in 2 coats.
Before fixing the insulation remove all loose and flaking materials from the wall, making areas smooth, stable substrate.
Around window openings, cut insulation at an angle to allow as much light as possible to enter the rooms.
Around reveals, sills and heads, affix 30mm Kingspan K5 insulation behind the mesh and continue render around to meet window and door frames. This will avoid any potential thermal bridges. Use angle beads to achieve clean straight corners.
Insulation boards should be taken down to DPC level with the DPC continuing underneath the insulation then Knauf Polyfoam High Impact board should be installed to 200mm below the top of the internal floor insulation.
Ensure any air bricks or mechanical ventilation is carried forward through the new insulation and any new ventilation required to comply with current Building Regulations.
Ensure all pipes and cylinder jackets are insulated, as this can lead to heat loss.
Hints and Tips
Contact your local planning office and find out if planning permission is required before work is carried out.
If there is a cavity present then other systems may be preferable.
All work should be undertaken by an accredited installer.
After the insulation is installed it will be very difficult to replace the windows. Therefore it is important to ensure the windows are in a good condition and are replaced or repaired before insulation is installed.
When walls are retrofitted with insulation it is just as important for the insulation in the loft to be up to date, otherwise condensation may form on cold ceiling areas.
Insulation boards should be installed break-bonded, with all joints butted.
Wherever possible, care should be taken to avoid cold bridging when attaching services and ancillaries to the exterior of the building.
Ensure any air bricks or mechanical ventilation is carried forward through the new insulation.