im getting black damp and what looks like mould on the top of my skirting boards with droplets of water running down them and also on the bottom of the walls in my bedroom .
i have a good gas central heating system and can get good heat build up in the rooms but if i leave either clothes or slippers on the flor over night they feel damp to touch . i can also feel a strong draft from what feels like coming from under the floor , is it possible that i have to much ventilation in my flat causing the walls to be cold and causing condensation . any help would be gratefully appreciated

De-Humidifier would help the symptoms by removing excess moisture from the air.

Do you have clothes drying in the house/flat? This could add moisture to the room.

Do you have a leak - In this severe weather there maybe water ingress from the roof which is finding its way into/between the walls.

The draft is likely comming from a temperature difference between your warmer room, and colder air beneath the floorboards, I assume you're in house so could also be air-bricks and draft comming up from them.

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what type of building do you live in?

Where in the building is the room? What type of room and which floor?

Its a groundfloor flat with brick on the outside with white roughcast and thermalite block construction inside with a 50mm cavity .
the room is the main bedroom and its a gable end room .

any ideas mate ?

if it's at floor height it sounds like rising damp.

Do you have any damp in, or below, the carpets?

Could you post a pic? If so, take one inside and outside the property.

Is there a chimney breast in the vacinity?

the moisture has got to be coming from somewhere and the 'running down the skirting boards' and 'black mould' does suggest condensation..
rising damp would be more a dark stain with evidence of salts coming through... mildew doesnt like salt
you didnt say what is under the floor...
if its timber floor and more or less straight on the soil then the heat in the room could be evaporating moisture out the ground just a stab in the dark but with little clearance and poor underfloor ventilation its possible..
failing that having a shower and leaving the door open causes bucketloads of moisture, washing machine etc...
top of the skirting board could have gloss paint underneath... a good place for mildew...
furniture up against it?
How old is this gas boiler?

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Hi and many thanks for your reply . The floor it tongue and groove floor boards with a solum underneath . its about 300mm from floor to solum level. unlike the regs nowadays with the solum having to be concreted it was black bitchamen and what looks like sand back then . the room seems to be well ventilated as there are two vents under the floor space that seem to give a good breeze through from the front to the back of the house and through the underlay and carpet which makes the room cold .
I was going to try insulation between the joists and laying new 18mm treated chipboard flooring . do you think this might help any ?
iv just had new Central Heating fitted . its a Vailiant 37 kw boiler that has more than enough clout to heat the flat and supply hot water . il try and get some photos up of the problem . Thanks for all your advice .

insulation would be a great help...
good link here... http://www.celotex.co.uk/Applications/Floors/Suspended-timber-floors

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