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Flat roofs that need repair may have:
A loose seam or edge of an overlapping felt.
Cracks or damage appear in the roofing.
A blister in the felt etc.
Flat Roof Repair
Want to try to repair it your self?:
To repair them, you will need:
Sheet or asphalt roofing felt
Asphalt roofing cement
Hammer and roofing nails
Trowel (A Putty knife
Roofing knife (A Utility knife
Paint brush (cut the bristles off 5% will do the
Locate the leak as closely as possible from inside. Place and secure
the ladder, then examine the condition of the roof from
Loose felt edges
Using a brush, clean out any dirt that may have blown under the loose
felt. Using broad-head roofing nails, nail loose felt
in place. Start nailing away from the felt edge and work toward the
edge to prevent making a blister in the felt. Place the
nails 1/2 to 1 inch apart.
After the felt is nailed in place, cover the patched area with
asphalt cement. Make sure the cement extends 1 to 1-1/2 inches
beyond the repair area.
Blisters in the felt
Cut the blister with a knife. Fill the area with asphalt cement as if
filling a crack. Continue, using the repair procedures
for cracks. (See steps 2 and 3 below.)
Cracks in the roofing
Clean out the crack and the surrounding area.
Place a thin layer of asphalt cement over the crack with a brush or
putty knife. The cement should completely cover the
cleaned area around the crack.
Cut a piece of roofing felt a little larger than the crack. Place it
over the cement and press it firmly in place. Nail all
four edges on the felt piece, spacing the nails 1 to 1-1/2 inches
apart. Spread another layer of cement over the felt piece.
Make sure the cement extends to 1 to 1-1/2 inches beyond all edges of
the felt piece.
Deteriorated or damaged roofing
This condition is difficult to repair. Never build up or cover the
old or damaged roofing with a series of felt layers. This
may change the drainage pattern of the roof and create more problems.
Remove damaged flat roofing. Clean the surfaces in and around the cut-out
Now cut pieces of felt to neatly fit the cut-out area. The number of
felt strips placed should equal the number of layers of
felt removed. Cut the top patch 2 to 3 inches larger so that it will
overlap the cut-out area on all sides.
Spread a thin layer of asphalt cement over the cut-out area. Then
take the first felt strip, place it in the damaged area and
press it firmly into place. Now spread a thin layer of cement over
the strip. Next, firmly press down a second felt strip.
Continue placing strips this way until the cut-out area is level with
the original roofing.
After the cut-out area has been built up to its original level,
spread a thin layer of cement over the cut-out area. Spread
the cement so that it extends 3 to 4 inches beyond all edges of the
Place the oversized felt strip over the cement and press it firmly in
place. Nail the strip on all four edges with broad-head
roofing nails, and then cover with cement, making sure that the
cement extends 1 to 1-1/2 inches beyond all edges.