DIY Network

How to Repair a Damaged Roof

We simulated the damage of a tree falling on a roof by dropping a piano from a crane. Such an accident can cause major structural damage. Consult a professional if there are any reframing needs due to building codes.

More in Remodeling

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  • Time

    Day

  • Price Range

    $250 - $500

  • Difficulty

    Moderate to Hard

Highlights:

Step 1: Read Tips

  • When installing shingles, make sure the nails are embedded securely into the felt and sheathing. Over time, the sun’s heat will cause the roof and shingles to expand, making the nails pop out of place and thus increasing the risk of a leak.

  • Because the roof is sloped, make sure you layer the shingles from bottom to top, overlapping the top set with the bottom. This will ensure your roof is protected from all the weather elements.

  • Rent a nail gun. Most can be rented for about $20 a day. The gun usually comes with a measurement guide that can save a lot of time. The standard width between each row of shingles is 5 inches.

Step 2: Repair Sheathing

After cleaning the debris and reframing the roof, lay down a base (sheathing). Eight-foot, 1/2-inch-thick plywood is standard sheathing material. Measure the opening of the section of roof to be shingled, cut the plywood to size and nail to roof rafters. Stagger the sheathing in a brick pattern for extra strength. Do not place an entire 8-foot section of plywood onto roof. Such a long piece is structurally unstable in the middle. Continue to install in brick pattern, staggering the plywood seams until the open area is covered.

Step 3: Lay Felt Paper

Start by stapling the 6-inch starter strip at the bottom section of roof leaving a 1-inch overhang on the eave to ensure drainage into the gutters. Going from bottom up, lay and nail the remaining felt layers with a 2-inch overlap. Be sure to nail the tar strip on each felt layer to ensure maximum hold.

Step 4: Install Shingles

Lay the first row of shingles starting at a bottom corner of the roof. Place a base row of shingles following the chalk lines on the felt and move upward in a pyramid shape. Use six nails per shingle to ensure maximum hold, and be sure to always nail on the tar strip. Continue working your way across and up the roof, following your initial pyramid base. If repairing a section of damaged roof, be sure you layer the existing shingles on top of the new. This will ensure a uniform and seamless look.

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