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black deposit behind a radiator

leakingpipe · 2011-09-25 20:19:50

Hi, would appreciate any advice with the following. About a year ago I put reflective insulation on the wall behind all radiators. Today I noticed when I lifted the insulation behind one radiator, positioned on an external wall, there was black on the wall even though the wall was painted lavender. The radiator is…

25-09-2011 8:19pm

#1

leakingpipe

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Join Date: January 2005

Posts: 8

Hi, would appreciate any advice with the following.

About a year ago I put reflective insulation on the wall behind all radiators.

Today I noticed when I lifted the insulation behind one radiator, positioned on an external wall, there was black on the wall even though the wall was painted lavender.

The radiator is underneath a window which I had staining along the vertical walls immediate to the single glaze window. I had to use mould spray to get rid of insulation sheet. The house was built in 1990.

I would really appreciate advice and also whether filling the cavity would eliminate this problem.

Any advice would be much appreciated.

0

Comments

#2 25-09-2011 8:35pm

Victor

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The airflow behind a radiator can draw dust. The heat ionises the dust and it sticks to things.

However, if you only put the insulation in certain places, you may be creating a point on the perimiter where there is a sudden drop in temperature and condensation is forming.

The think is to insulate everything and avoid 'cold bridge'. However, cold bridges are usually experienced as isolated spots - your entire house is the cold bridge, except for the insulated bit.

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#3 25-09-2011 8:39pm

heinbloed

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With ****ty windowsills ( http://www.boards.ie/vbulletin/showthread.php?p=70618341) you are faced (propably) with water ingress. Since this water can't evaporate as fast as it enters the walls will become saturated. Ad heat from the radiator and you have a microbiological circus.

Nothing that a cavity fill will solve. Keep the water out.

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#4 25-09-2011 8:40pm

DoneDL

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leakingpipe wrote: »

Hi, would appreciate any advice with the following.

About a year ago I put reflective insulation on the wall behind all radiators.

Today I noticed when I lifted the insulation behind one radiator, positioned on an external wall, there was black on the wall even though the wall was painted lavender.

The radiator is underneath a window which I had staining along the vertical walls immediate to the single glaze window. I had to use mould spray to get rid of insulation sheet. The house was built in 1990.

I would really appreciate advice and also whether filling the cavity would eliminate this problem.

Any advice would be much appreciated.

Staining is nornal enough and its caused by convection around the radiator. If the cavities aren`t insulated then it`s well worth getting it done.

0
#5 26-09-2011 9:18pm

leakingpipe

Registered Users, Registered Users 2 Posts: 14 ✭

Join Date: January 2005

Posts: 8

Thanks very much for your advice.

0