Damp for one.babydays said:could you tell me what problem could arise from closing it over.
You need to leave ventilation holes or fit one of those sliding plastic vent covers on any cover fitted to the fireplace. Might be simpler to use one of the suggestions in the other thread linked above for fitting draught excluder (with ventilation) to the chimney.We intended putting a sheet of wood over the fireplace and paint it on the outside.
I guess he has never worked in construction so?My father-in-law wants to just block it and scoffs at my worry that there might be 'some problem'.
Unused chimneys may be blocked with baffles or closed up,
but a small opening should be left to air the chimney.
Ensure adequate ventilation
The ventilation rate should be high enough to prevent the
build-up of moisture (and pollutants) in the indoor air, but
should not be so high that it causes excessive heat loss.
The optimum ventilation rate will vary depending on
what activity is going on and the weather conditions on
the day. In well-sealed houses (e.g. those with draughtstripped
doors and windows, blocked-off chimneys, etc.),
ventilation should be provided through controllable
openings such as trickle vents or windows that can be
secured in a marginally open position. These can be
adjusted by occupants in response to ventilation
requirements. For example, they might be opened on
calm days when large amounts of moisture are being
generated in the house, and closed on windy days when
little moisture is being produced. Signs such as misting up
of windows indicate the need for increased ventilation.
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