The most common mistakes made during insulation of attics

Up to 25-30% of the thermal energy escapes through the uninsulated roof. This is sufficient reason to invest in a solid insulation layer, especially if the attic is to contain living quarters. In theory, it should not be difficult to insulate the attic. Despite this, the same mistakes are still being made. Which ones?
Too thin an insulation layer
The minimum thickness of mineral wool insulation shall be that of rafters. In order to ensure much better insulation properties of the roof, it is worth adding another layer that will cover the rafters and thus eliminate the potential thermal bridge.
No insulation of the masonry
This error is one of the most serious, because an uninsulated brickwork will be a large thermal bridge. It is important to pay attention to this element.
Poor wool-cutting
The stone wool strip should be approximately 2 cm wider than the rafter spacing. This will allow you to easily place it under the rack and eliminate possible interruptions. Too wide a strip of wool will push out the initial roofing foil, which in turn will result in insufficient ventilation of the space under the tile or sheet.
Non-application of vapour-permeable foil
It is necessary because it protects the attic from ventilation and wool from getting wet (as a result of condensation of water vapour). Lack of foil is a serious mistake, which can destroy the whole effect of thermal insulation. The foil must be laid with suitable overlaps and carefully glued so that it does not delaminate.
Lack of diligence
Mineral wool is so elastic that it should not be difficult for anyone to position it precisely between rafters and under the rack. Nevertheless, some performers show far-reaching nonchalance or simply bad will. They lay wool down as little as possible, which causes thermal bridges to form.
No ventilation gap.
Mineral wool must not adhere tightly to the pre-covering foil. If this happens, it will not be possible to ventilate the slope. This will cause moisture to accumulate on the formwork or directly on the wool. Wet material loses most of its insulation properties.
If you have the insulation in your loft, look at it with your hands and ask your site manager to check the work before screwing on the plasterboards. At this stage, it will still be possible to fix any errors cheaply.

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