Vapour barrier in metal shed after insulating


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Old 12-06-16, 07:21 AM
J
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Vapour barrier in metal shed after insulating

Hi all,

I have a small metal skinned shed, its fairly air tight as it stands, 100% water tight (and surprisingly little condensation) and will in the near future be heated + forced ventilation.

I have battoned out interior (walls and roof) and lined the interior with RWA45 (I acquired cheap and wanted some noise reduction), I have got to the point where I can board it all out but have read I should install a vapour barrier.

it occurred to me that the metal skin is going to act as a vapour barrier itself, all be it on the wrong side of the insulation.

So do I skip this step as I don't want to trap moisture between the interior and exterior walls?

This in the UK in case it helps.
 
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Old 12-06-16, 10:26 AM
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If it is ribbed, the metal will not likely be air tight, which negates any value it has as a barrier. We don't know your climate to recommend a vapor barrier or not, but the latest science says that a class III vapor retarder is sufficient in most climates. Latex paint applied to drywall qualifies as a class III vapor retarder. IMO, that is all you need.
 
 

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