Attic Temperature Differential Winter

As snow accumulates it alters the temperature profile of an attic and roof surface.

Attic temperature differential winter.

Interior attic air exterior air inner and outer sheathing and internal rafter temperatures of black and white shingled chambers were monitored. Yesterday s outside temp topped at 91 f inside temp 78 f a c off all windows closed and attic 112 f. Kingmurphy 04 32am 11 20 05. When i left for work in the morning outside was 73f inside 74f attic 75f i m happy with the interior only creeping up 4 degrees a c off windows closed is the 21 degree differential temp ideal for an attic in the n.

After the worst winter we ve had in a long time and the ice ripping the gutter and fascia board off my house i d had enough. Temperatures were measured using thermocouples and recorded over a 3 year period from october 1991 through september 1994 using a datalogger multiplexer device. Your attic temperature should be at or near the outside air temperature if it is well ventilated and does not leak warm air into the attic from below. Is there any rule of thumb for attic temps compared to outside temp.

I only had r 19 up there added another 30 on top of it and noticed the old insulation was crammed right tight to the sheathing. The cooling load for a home air conditioner depends on the difference in temperature between the inside and outside air and reduction of attic temperatures from 155 degrees to 105 degrees f will result in a significant reduction in cooling load. If your attic soars above 100 degrees and reaches the 150 mark its time to consult. Now if the ridge vent is only partial or if the attic air temperature is excessive 20 degrees higher than the outside air fans may prove beneficial pick the right fan.

The white roof lowered the attic temperature by about 20 f.