Roof Line Not Straight

Roof lines should be arrow straight.

Roof line not straight.

If you can see a dip curve or swag on the peak when standing in the street your roof has a problem. This droopiness could be caused by moisture and ventilation problems. It is probably feasible to straighten up the roof line a bit when the metal roof is installed. At other times the gutters may need to stay where they are so gravity can do its work.

After your floor is straight it is time to concentrate on the next floor s ceiling. The rotten wood may be because the sag has caused water to gather repeatedly in that area. Repeat this on both sides of the roof. Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.

Ask an assistant to hold the end of a chalk line on the first shingle at the longest edge of the roof. Every 5 inches make a new mark until you get to the rop of the roof. The end of the line is 4 inches from the lower edge of the roof which is standard exposure. Use the chalk line to snap a straight line vertically every 6 inches.

Screw a 2x4 about 12 long with a small nail sticking out on the 1 1 2 side. Sometimes an uneven roof is simply a sign of minor errors or aberrations in construction. This will be the bottom of your board. It might be something basic you can handle yourself but.

Crooked gutters can make a roof look crooked even if the roofline itself is straight. Run your string line from the nails and measure up from the string.