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Posted by Bob Minchin on October 12, 2006, 3:34 pm
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> On Thu, 12 Oct 2006 07:23:10 +0100, Tim Leech
>
> >On Thu, 12 Oct 2006 00:14:43 +0100, Stephen Howard
> >
> >>
> >>Having recently moved shop I now find myself beneath a corrugated
> >>aluminium roof.
> >>First order of business was to seal the various gaps and holes to
> >>prevent the ingress of rainwater - but I also need to tackle the
> >>problem of condensation.
> >>I'm sure many readers here will have dealt with such problems before -
> >>any handy hints?
> >>It's likely that I'll resort to insulating the roof - if only to save
> >>heat and cut out the noise of the rain.
> >>
> > Mine used to have a corrugated glass fibre roof. It was a nightmare
> >in the winter, ice would form on the underside overnight, then a bit
> >of heat in the morning would melt the ice & would literally be rining
> >in the shop.
> >Get it insulated as soon as you can!
> >
> ..Just avoiding the drips here...
>
> I used expanding foam to seal up a few holes, and I notice this
> morning that although the roof is completely covered in condensation,
> none of the spot of foam are wet...even small beads.
> My concern is that if I insulate the roof without first addressing the
> condensation problem, I run the risk of simply 'boarding up' the
> problem.
> Might grab a bottle of that spray foam insulation and see just how
> thinly it can be applied and still make a difference.
>
> Regards,
>
>
>
> --
> Stephen Howard - Woodwind repairs & period restorations
> www.shwoodwind.co.uk
> Emails to: showardshwoodwindcouk
Stephen,
It is absolutely vital that the insulation you choose does not allow water
vapour to pass through it onto the cold metal surface. THis will condense
and saturate the insulation and then drip though into your workshop.
As you have seen the foam sprayed areas are quite dry and this type
ofinsulation will quite likely be the best for your application.
I don't know what the cost would be or how much you have to cover but
getting a contractor in and spraying with 2 part polyurethane foam might be
worth considering.
There is a system that is used to spray the underside of slate roofs which
bonds slipped slates. This might do the job and be available in 'domestic'
quantities more easily.
Good Luck
Bob
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> aluminium roof.
> First order of business was to seal the various gaps and holes to
> prevent the ingress of rainwater - but I also need to tackle the
> problem of condensation.
> I'm sure many readers here will have dealt with such problems before -
> any handy hints?
> It's likely that I'll resort to insulating the roof - if only to save
> heat and cut out the noise of the rain.