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Our roof has shingles, but we can not find the leaks!
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When you say semi-flat - if 1:10 (1 foot rise in 10 feet of run) or flatter, then this is a flat roof and should get a membrane type roof like hot-mopped tar, EPDM, etc. If steeper than 1:10 to about 2:10 (4:10 in snow or icing country) then a shingle roof should have a continuous water barrier under it, or use a standing seam metal roof or a membrane roof like EPDM. 4:10 and steeper should be OK with shingles with ice and water shield along the bottom 3-6 feet and around bathroom/kitchen fan vents in icy areas, and regular roof wrap or felt under the shingles elsewhere.
Perhaps if you describe your roof and the leaks a bit more using Submit Answer, one of us can give you better advice on your problem, as a leaking roof rarely calls for a reroof unless the shingles are really looking sorry or buried in organic material and moss.
Answered 7 years ago by LCD
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Check the area around the lower edge of the roofing paper( under the shingles), and the installation of the drip edge and the back of the gutter. If water is coming under the drip edge and consequently behind the gutter, then there is the problem.
Answered 7 years ago by brentrkopp