The upstairs of my (old) house is half ‘in the roof’ - in each bedroom and the bathroom, there is a 45 degree meeting point.

Under each of these is a horizontal wood covered “platform” of around 18 inches then the wall comes straight down to the floor from there (so if you looked at it side on it makes a number ‘4’ kind of shape with the eave set back).

Where the sloping plastered ceiling goes into this eave, I get black mould on the north side of the house. I decorated throughout this summer, but it’s reappeared already.

Obviously, we bleach it and keep it as well ventilated as the weather allows, but I was thinking that if I put a side of wood into the eave it might help. So … if I find some suitable planks (or MDF) of around 3.5 inches in height to place in the eave vertically to 'box off' the corner sections, my questions are:

1. Is this a good idea?
2. If yes, what shall I insulate the resulting triangular gap with?
3. What’s the best saw for cutting one side of the wood at a 45 degree angle (I only have hand saws at the moment but am happy enough to buy a specialist saw of some kind to do this with)
4. I’ll paint the wood – so on this basis, is wood better than MDF?

TIA

Hi Ginger...

I think you're idea will only make matters worse in the long term, better to eradicate the mould than do a cover up job.

Try looking here
http://www.blackfriar.co.uk/anti-mould-solution

and here
http://www.zinsseruk.com/Shop/Product.a ... 9&pgId=431

apply the mould solution before filling/making good. then apply the bin then yor choice of top-coat.

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Verwood Handyman
I Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....

In the position where you have the mould, ie junction of ceiling joining the wall, is there a good air flow at that point.
If its crammed with insulation, you need to clear it.
I wouldnt recomend adding more wood to cover it up.

Thanks very much cotswold builders and wine~o; excellent advice and it saves me an awkward and time-consuming job! I shall try some "product" on it and see how I go on.