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Housing - Renovation: No Frost above Dormer Room

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    • CommentAuthorbobn
    • CommentTimeDec 26th 2007
     
    We recently extended our bungalow, constructing a bedroom and bathroom in the loftspace. In keeping with building regs the converted loftspace is lined with lots of Celotex type insulation between and under the rafters. I was surprised after the recent frosts to see no frost on the tiles immediately above the converted loftspace rooms but plenty above the empty loftspace. The empty loftspace has 120mm Rockwell between the joists.
    Is this lack of frost normal or have the builders installed the converted loftspace insulation incorrectly?
  2.  
    Hi bob, I am not surprised the roof above the the empty loft space has frost as the temperature within the loft will be close to the outside temperature. Most heat which is getting into the loft space is probably being lost via any ventilation. The internal temperature of the bedroom is much higher and this heat will be lost through your roof construction, the level of heat lost depending on the level of insulation, as well as the temperature difference. The higher the temperature you have inside, the quicker any frost on the slope above will melt. Do you run your heating in this room overnight?

    The orientation of the slopes will also play a part in whether there is frost on a particular slope, as will any local weather factors such as wind, morning sun, humidity etc. I would monitor this for a little longer before worrying too much.
    • CommentAuthorbobn
    • CommentTimeJan 3rd 2008
     
    Hello Mike, Thanks for your comments. Reason behind my question was that I always believed that the frost above an uninsulated loft melted quicker than an insulated one due to the house heatloss melting the frost. I fully expected to have a frosty roof due to the level of insulation placed between the tiles and the I was comparing my roof with others in the road. They all orientate east/west. Is my basic premise wrong?
  4.  
    Posted By: bobnHello Mike, Thanks for your comments. Reason behind my question was that I always believed that the frost above an uninsulated loft melted quicker than an insulated one due to the house heatloss melting the frost.


    Yes, but your scenario doesn't seem as simple as that.

    Posted By: bobn I fully expected to have a frosty roof due to the level of insulation placed between the tiles and the I was comparing my roof with others in the road. They all orientate east/west. Is my basic premise wrong?


    No, but subject to other factors I listed above. What do others here think?

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