Reflective foil insulation for roofs has been around for a
few years and is something that has been used in our new roof. Generally in England for roofs to comply with
the U values laid down in part L1A of
the Building Regulations using fibre glass based material requires thickness's
up to 250mm.
In our roof because of the raised tie the area where there
is a slope in the ceiling there is only the full depth of the 70mm deep rafter were insulation can be placed. Bearing in mind that a 25mm air gap is required
over the insulation then there is only a maximum of 50mm available for
insulation, well short of what is required.
The answer for us was to use reflective insulation fixed to
the underside of the rafters prior to fixing of the plaster board.
So what makes reflective foil insulation so high performing
when compared with glass fibre materials. The answer is radiation and
conduction. Reflective insulation is made from layers aluminium foil, wadding
and air bubbles and works by reflecting radiant heat and is around 95%
efficient. Whereas traditional materials such as fibreglass blankets relies on
its ability to resist the passage of heat by the trapping of air in its mass. Reflective
foil is may times more efficient as a
insulator and does this with far less material.
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