Measure the internal width of the window at three high, medium and low points. Do not forget to always measure the opening at the point of the window where the shutter frame will be installed. Keep the smallest or narrowest internal measurement at 116 inches for width in the order form.

Measure the opening width. Determine the distance between the wall and the wall at the top and bottom of the opening. Measurements should be 116 inches. If different, choose a door with the largest width for a circle door or the smallest width for a pivot door.

Place a tape measurement on the left side of the attic opening, on the inside edge of any trimming molding, but the outside of the current frame of the attic ladder. Stretch the tape measurement on the right side of the attic ladder door, stopping on the inside edge of the molding on this side.

20-40 minutes on average for an installation (depending on the brand of the model). 5 minutes more for a construction in construction. 20 minutes more for a double construction 54 (lights) and including a primary jacket. 30 minutes more if it is a storm door POS Larson.

To measure accurately for a stormy door, measure the height of the door on the sides and at the centre of the upper part of the threshold lower than the lower part of the head. Then, measure the width of the door inside the coating at the top, middle and bottom of the door.