A 1/8-inch gap beneath a 36-inch exterior door creates 4.5 square inches of open space, before counting the gaps along the sides and top. That small-looking leak can make a room feel cold even when the heating system runs normally….
A 1/8-inch gap beneath a 36-inch exterior door creates 4.5 square inches of open space, before counting the gaps along the sides and top. That small-looking leak can make a room feel cold even when the heating system runs normally….