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1. Slope angle and material: if the roof is too shallow, wind-driven rain can penetrate. Pitch must relate to the material: interlocking: 12–22 degrees slate: 21–33 degrees pantile: 25 degrees plain tile: 40 degrees thatch: 45 degrees. All tiles should be clean and intact, with small gaps and good overlap. 2. Gutters and downpipes: These should be clean and...Explore the subscription options here to get full access to isurv, including downloads.
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