In those cases where the external insulation of the facade wall is not possible (eg. existing buildings with protected facade view or walls with direct contact to ground, etc.), the RAVATHERM™ XPS 300 WB insulation can be applied onto the internal walls.
As the insulation is applied on the warm, inner side, the wall structure will be exposed to more severe temperature changes.
Increased attention should be paid also to thermal bridges at the adjoining structures (walls, floor slabs perpendicular to the facade walls). The condensation risk must be checked carefully, especially at rooms with high relative air humidity.
The internally insulated rooms require regular and efficient ventilation.
The rough surface of the RAVATHERM™ XPS 300 WB boards create a suitable basis for plastered or adhered finishings (gypsum board, ceramic tiles).
Due to the relatively high vapour diffusion resistance of the boards, generally there is no need for additional vapour barrier.
CONSULT AN EXPERT
For designing thermal insulation for the inner side of an elevation wall, accurate knowledge of the existing uninsulated wall structure is a must. Thermal insulation will be installed on the internal side of the wall structure, so the winter temperature of the wall which is insulated from heated spaces and exposed to the temperature variations of the outside space will decrease as compared to the uninsulated status, and there is a higher risk of possible freezing. This is why inner-side thermal insulation can be applied in the case of walling made of frost-resistant materials in the entire cross-section.
VAPOUR CONTROL, VENTILATION
In most inner-side thermal insulation solutions, the design of internal vapour control, professional installation and the protection of vapour control layer(s) in case of building operation is inevitable. Thanks to the high vapour diffusion resistance of RAVATHERMTM XPS 300 WB, the thermal insulation can be used without a separate vapour barrier layer. If the thermal insulation is installed with close connection, with a closed gap, the risk of condensation and mold-growing behind the thermal insulation will remain low.
THERMAL INSULATION TURNED OVER
In order to prevent the “migration” of the condensation zone from the corner to the ceiling or floor, thermal bridge effects need to be reduced and the thermal insulation should be turned over also to the adjoining structures (ceiling, partition etc.) in a 30 to 50 cm width where necessary.
In consideration of the above, the RAVATHERM XPS thermal insulation boards provide a durable and efficient solution also as the inner-side thermal insulation of walls.