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Energy efficient ventilation and improved insulation
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Energy efficient ventilation and improved insulation can solve condensation and mould problems
Where a door is tight to the carpet, trimming the bottom will aid air circulation.

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Government guidance on ventilation recommends leaving a small gap beneath doors. Where a door is tight to the carpet, trimming the bottom will aid air circulation.

Dehumidifiers are not an effective solution for condensation and mould problems
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Dehumidifiers are not an effective solution for condensation and mould problems.
door trickle vent cover
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The hallway of this house in Huddersfield was prone to mould.
Fitting a trickle vent in a door helps air movement
A ceiling mounted extract fan with humidity control, and trickle function
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Severe condensation on a window
fitting a trickle vent
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Forming a slot in the window frame is a more effective way of fitting a trickle vent than drilling a few holes - as we found at one property
bathroom fan
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This bathroom fan vents directly into the loft and has caused the roof timbers to become damp.
a high quality humidity controlled extract fan, with always-on trickle function
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1. The original intermittent extract fan vented through a long uninsulated pipe
- which filled with condensed water and dripped back into the fan.

2. We installed a high quality humidity controlled extract fan, with always-on trickle function,
used insulated ducting and wrapped insulation around the rigid pipe.
air bricks
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These air bricks are positioned at the bottom of the wall and feed air to underneath the timber floor.

Sealing them increases the likelihood of rot in the floor timbers and contributed to the mould problem in the flat.
vapour vent
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The foam core in this vapour vent reduces problem draughts but still
allows humidity to pass to the outside
roof timbers have become very damp
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This loft has been air-tight for many years and the roof timbers have become very damp. The meter reading is in the 'red' zone, meaning high water content.
Prolonged dampness has caused these timbers to be weakened by wet rot
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Prolonged dampness has caused these timbers to be weakened by wet rot
these internal vents are highly effective at providing loft ventilation
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With no changes required to the outside of the roof, these internal vents are highly effective at providing loft ventilation
insulated platform for loft storage
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When installed correctly trickle vents can be a valuable part of a home ventilation system
Retro-fitting a trickle vent
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Retro-fitting a trickle vent.
We think all windows should have these as standard
wall vents
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When wall vents face the prevailing weather a wind cover will stop problem draughts
external vent cover
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Fitting an external vent cover
Secondary glazing
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Secondary glazing is very effective at stopping draughts,
but condensation and mould can often form as a result
EPS beads
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The temperature of a wall is always cooler lower down - attracting more mould which can give the appearance of rising damp
recessed fan
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A humidity tracking fan recessed into a bathroom ceiling in Cottingley
severe mould on walls and ceiling
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The master bedroom of this house suffered from very severe condensation and mould
long flexible duct
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Long lengths of flexible ducting rob ceiling fans of power
This diffuser feeds a controlled flow of pollen filtered fresh air into a home
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This diffuser feeds a controlled flow of pollen filtered fresh air into a home from a unit located in the loft

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Too much humidity and not enough ventilation
= damp, condensation & mould