How to Install Roofing Around Dormers


When it comes time to roof your house you will need to decide what type of roofing material to use and how it needs to be installed. One of the most common types of material that you can use on your roof is a standard asphalt shingle. You will also need to know how to lay roofing material around obstacles and different roof lines such as around a dormer.

Things You'll Need

  • Hammer or Nailing Gun
  • Roofing Nails
  • Shingles
  • Tape Measure
  • Chalk Line
  • Felt Paper
  • Straight Edge
  • Utility Knife
  • Cover your roof with felt paper before laying any shingles.

  • Measure 11.5 inches up from the edge of the eave along the entire width of the roof. Use a chalk line to mark this, indicating where the starter course will be placed.

  • Place a shingle upside down so the tabs on the shingle are pointing up and are even with the chalk line. Drive a roofing nail between each tab, about 1 inch below each slot. Continue to add shingles, using this method, until you have filled out the row.

  • Apply the first row of shingles over the starter course. Make sure the tabs of the shingles are pointing down. Nail each shingle in place to complete the first row.

  • Continue to add additional rows of shingles until you reach an obstacle, such as a dormer.

  • Install a full row of shingles on the roof right where the top of the dormer's roof line meets the roof itself. This will maintain the shingle pattern.

  • Use the chalk line to snap a vertical line on the opposite side of the dormer as a reference.

  • Install shingles on the roof beginning at the bottom of the dormer, working upwards from the roof eaves. Use the chalk line you snapped earlier as a reference to maintain the shingle pattern.

  • Use a utility knife and straight edge to trim off excess shingles in the valley where the roof line and the dormer's roof line meet.

  • Place shingles on the roof of the dormer. Start at the bottom edge and work your way up to the peak. Add rows until the shingles have overlapped the roof line valley.

  • Trim off any excess shingles from both sides of the valley roof lines when you have finished installing the shingles.

Tips & Warnings

  • An automatic nailing gun will make the process easier and faster than using a regular hammer.
  • Do not cut into the felt paper when trimming excess shingles with the utility knife.

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