Last December I installed some R-21.5 Roxul (perpendicular to the
joist) over the blown in rockwool that filled the 2x6 cavities in my
attic. I did what was recommended by the inspector and sealed as many
holes as I could find in the attic and installed baffles at every 2nd
soffit to ensure proper ventilation. I even took care of weather
stripping and properly insulation the attic hatch. Yesterday when it
was -25c I check out the attic and was shocked to find that insulation
a little bit of frost on top of it. The was no frost on the underside
of the roof or rafters. Is this normal? Will the insulation dry out?

Thanks for you help

Marc

Marc wrote:
Last December I installed some R-21.5 Roxul (perpendicular to the
joist) over the blown in rockwool that filled the 2x6 cavities in my
attic. I did what was recommended by the inspector and sealed as many
holes as I could find in the attic and installed baffles at every 2nd
soffit to ensure proper ventilation. I even took care of weather
stripping and properly insulation the attic hatch. Yesterday when it
was -25c I check out the attic and was shocked to find that insulation
a little bit of frost on top of it. The was no frost on the underside
of the roof or rafters. Is this normal? Will the insulation dry out?

Thanks for you help

Marc

At -25º C ~ -12º F it is cold enough for some interesting things to
happen. You don't have any bath or kitchen vents into the attic do you?

" installed baffles at every 2nd soffit to ensure proper ventilation."
Were there vents in to the outside on the other soffits????



--
Joseph Meehan

Dia duit