How to replace your roof
Check your attic ventilation
Proper attic ventilation is a key component of a good roof. You should have intake vents located in roof overhangs and exhaust vents at or near the roof’s peak, says Todd Miller of Classic Metal Roofing Systems in Piqua, Ohio. If insulation has migrated to block your intake vents, it needs to be cleaned out.
Proper attic ventilation also reduces your air-conditioning bills in the summer and, in northern climates, reduces the chance of ice dams in winter. When heat travels through your attic to your roof deck, it melts the snow on your roof from underneath. The melted snow runs into the cold overhangs on your house and refreezes as ice.
The solution, Miller says, is good attic ventilation and good insulation on the attic floor. By keeping the heat out of the attic and allowing an outlet for any heat that does enter the attic, the roof deck won’t get heated and ice dams won’t form.