One should also remember that roof tiles are laid in a
certain way – to allow airflow under the tile. Applying a coating to the
exterior of the tile won’t stop that airflow, neither will it stop warm air
from escaping through roof vents, soffit vents, through gaps between tile
overlaps, around lead work etc. Even a roof without visible vents can be cold
and breezy, that’s perfectly normal.
This is why the government and energy companies refuse to
offer grants for thermal roof coatings - they simply don’t work.
It is much cheaper to increase the amount of loft insulation
you have above the ceiling or to have cavity wall installation installed.
So next time you see a website or leaflet boasting about how
this thermal coating can reduce tile heat loss by 10-20% etc just
remember, very little heat goes directly through the tiles, most goes around
it! And for good reason – to prevent condensation.
That is why your loft is always cold in winter, even if the
house below is warm.
The purpose of protection is to keep the habitable part of
the house warm that is why on most homes the insulation is placed above the
ceiling, not on the exterior of the tiles.
Ensure that you have good quality insulation above the
ceiling and you won’t have to worry about heat going through the ceiling, let
alone through the roof tiles.
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