Damp Proofing Question

All our bedrooms are covered in mould!

we have been living in an old victorian house for nearly ten years now. When we bought it, it was fully renovated and we havent have any problems until now: we seem to be riddle with mould and condensation. Started in my son's room, and we only notived it when we noticed all his clothes inside his wardrove were mouldy. His room has been smelling like humedity and damp for a while. We treated the whole room as well as we could, but we discovered the same in the other 3 rooms. We dont know what to do! we seems to have also a leek from the roof that is affecting one of the toilets. Who do we call? our walls are literaly going black and damp as we speak. The house is 105 years old.please help!

2 Answers

the problem with older propertys is that they must be treated with respect .

the original materials should be used when renovating.

the walls will be built using lime mortar

it has possibly re-pointed with portland cement

[ their is no cement in lime mortar ]

the inside walls would probably have been lime plaster.

these materials allow your walls to breath . using cheaper newer materials will stop this process and can create dampness.

ventilation is important and a window should be opened in all the rooms a small bit to allow air circulation.
the roof leak should be attented to as soon as possible by posting it in the roofing /building section on the site and getting someone out to advize your best solution.

without looking at the problems it is not possible to give you an acurate reason for the toxic mould other than it is caused by dampness.

this can be condensation if their is insuffient air circulation
can be bad or incorrect material used for pointing, cracked or broken tile/slate leaking guttering, dripping overflow,
you must find the sourse of the damp to get a proper solution.

best wishes alex

Answered 19th Dec 2011

ADR Property Maintenance

Member since 1 Mar 2009


You have said you have a roof leak so this is not helping with rain and cold damp air getting in, this needs to be sorted out as soon as possible.

I imagine most of the walls affected with mould/Toxic mould are mainly external walls! The damp laden air being condensation from leaky roof,cooking,cleaning,general living,washing,bathing,insufficient heating and lack of ventilation all contribute.

Condensation season is October to March.

Remedy is Ventilation....Its ok to open windows but on doing this your letting cold air in and being there is a high relative humidity in the property from damp conditions! The air cools and still condensates.
Try to keep a constant heat in the property and not have radiators on and off as this does`nt help. When cooking or showering keep the doors to these rooms closed and put extraction units on if you have them!
All the mould needs to be thoroughly cleaned with a good mould cleaner and possibly re-painted with a mould inhibitor mixed in with the paint.
Also heat recovery units are a good idea as they take the moist laden air stale air out and filter clean warm air in through a electrical unit.

Good luck

Answered 20th Dec 2011

Cannon Preservation Ltd

Member since 21 May 2011

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