The traditional-conventional rooftop insulation is the most well-known and most reliable solution in roof insulations.
The advantage of the traditional-conventional insulation is that the thermal insulation materials are protected by the discharge flow materials and the waterproofing, and are able to perform at their full potential.
Cleaning of the entire surface, smoothing out of the area and removal of various loose mortar.
Coating with asphalt emulsion on the entire length and width of the surface to create a vapour barrier. This prevents the accumulation of moisture the form of vapour in the interior of the house towards the insulated surface.
Installation of graphite extruded polystyrene foam RAVATHERM XPS X SHAPE BL (Ravago), at least 6 centimetres thick.
Construction of fibre-reinforced foamed concrete in a mixer, with a thickness of 10 centimetres and discharge flows towards the downspouts of at least 1.3%. With this method we achieve water drainage and partial thermal insulation. Specifically, 10 cm thick foamed concrete is equivalent to 3 cm thermal insulation slabs, i.e., it has a thermal conductivity coefficient of λ=0.11 (W/mK).
Mortar composition: A minimum of 300 kg cement per cubic metre, polypropylene fibres and enhancer and water.
(For the formation of discharge flows in a newly constructed building, reinforced concrete can be alternatively used and is cases where there is time limit on completing the project, fast-setting mortar can be used.
Once the foamed concrete cures and has fully set, which can vary depending on the weather conditions, the asphalt varnish Primer (soluble or water-based) is applied to the entire surface. This varnish increases the adhesion of the bituminous membrane to the under layer and helps to prevent it from peeling off at the edges.
This is followed by the main waterproofing with the superior quality bituminous sheet in the SBS category (elastomeric) Dien Energy ++, weight6 kgs, with an upper layer ofwhite mineral tile, and elasticity at -20 °C and 180 gr spun bond polyester reinforced with glass fibres. The thermal adhesion of the bituminous sheet to the underlay is done using the appropriate open-flame torch. The bituminous sheets are adhered in parallel starting from the downspouts of the lowest point of the joint of various rooms. This ensure the uninterrupted flow of water. The overlapping of the bituminous sheets in 10 centimetres lengthwise and at least 15 centimetres at the ends. During adhesion, the overlapping bituminous sheets are pressed lightly until the fusion of the material emerges at the joint; this is evidence that the adhesion of the bituminous sheets has been sealed. We extend 18 to 20 centimetres up the parapet and on occasion we cover the entire parapet. Specially-shaped bituminous sheet pieces are placed on solar panels, tanks, pipe sleeves, downspouts, pipes, as well as all the vulnerable points.
The insulation is strengthened with the application of an elastoplastic acrylic and polyurethane sealant at all the vulnerable areas. In addition, the perimeter is sealed at the point where the edge of the bituminous sheet meets the parapet or wall. This method essentially eliminates any chance of the bituminous sheet detaching all the edge despite the strain it is under.
Based on national standards, a second layer of bituminous sheet which is installed parallel to the first layer with a 50 cm shift is optionally recommended for further reinforcement of all roof top insulations.
In the case of a parapet, it is optionally recommended that the edges of the bituminous sheets are fixed to the vertical surfaces with aluminium rods. Galvanised nails and washers are used for fixing these sheets.
The laying of slabs, cement mortar and tiles and/or other rigid coating is possible to achieve walkability.
The benefits of traditional-conventional rooftop insulation:
Traditional-conventional roof top insulation provides 100% protection against moisture from exterior climate conditions.
The impacts of the climatic effects (hot, cold) are effectively reduced.
It does not settle as other with rooftop insulations and follows the expansions and contractions of the insulated surface thanks to the elastomeric materials.
It adheres perfectly to all building materials.
It is affordable and the construction cost is amortised within three years.
It offers energy efficiency of up to 65%.
It is lightweight (about 35 kg/m2), so it is appropriate in cases where the use of heavier materials is not possible due to the static inadequacy of the construction.
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