Internal thermal insulation of the walls involves the installation of thermal insulation to the inside of all vertical interior walls, beams, columns and the ceiling of the building. Internal thermal insulation is usually chosen when external thermal insulation of the surface is not feasible, mainly due to being inaccessible.
It is possible for internal thermal insulation to be installed only on problem surfaces, e.g., northern wall of a house, thus significantly reducing the constructional cost.
Application method:
The first stage involves the installation of a metallic frame on the surface to be insulated using metallic anchors.
This is followed by the insertion of 5 cm thick mineral wool or stone wool inside the metallic frame to achieve thermal insulation of the wall.
The entire length and width of the surface is then lined with 1.2 cm thick Knauf waterproofed gypsum boards.
Lastly the gypsum boards are grouted. A self-adhesive mesh drywall joint tape is adhered and putty is applied.
Optionally:
If internal thermal insulation is place beneath the slab (i.e., on the ceiling) of the last floor, it is recommended that stone wool with a vapour barrier (aluminium sheet) on its lower surface.
Based on national standards, it is recommended that fire-resistant gypsum boards are optionally placed on the ceilings.
For better noise insulation, the metallic frame can be inserted on placed and a visco elastic membrane can be applied in combination with second gypsum board.
Internal thermal insulation has the following advantages:
With the installation of internal thermal insulation, the thermal insulation results are instantaneous, since the thermal insulation is position before the structural elements, resulting in the interior of the building heating up faster in winter and cooling easier in summer.
The thermal insulation material is not exposed to the elements and climate changes, thus it does not require special protection.
Given that all the internal thermal insulation works take place inside the building, it can be done any time of the year, regardless of weather conditions.
It does not change the appearance of the building given that no work is done on its exterior.
It does not have an expiry date because the insulation is inside the building.
Other than the require thermal insulation, the insulation materials (mineral wool & gypsum boards) also offer noise insulation.
It is affordable and the construction cost is amortised within five years.
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