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2. Bituminous waterproofing - Wikipedia

   en.wikipedia.org/wiki/Bituminous_waterproofing

   Heavier material is typically used for underlayment of longer-lived roof materials in order to match their longer life span, and on less sloped roofs, which are more susceptible to leaking. For example, two layers of No. 30 felt might be used under a slate or tile roof, whereas a single layer of No. 15 might be adequate for a steeply raked roof ...

3. List of commercially available roofing materials - Wikipedia

   en.wikipedia.org/wiki/List_of_commercially...

   Very long lifespan, fireproof, and low cost but now rarely used because of health concerns. [5] Stone slab. Heavy stone slabs (not to be confused with slate) 1–2 inches thick were formerly used as roofing tiles in some regions in England, the Alps, and Scandinavia. Stone slabs require a very heavyweight roof structure, but their weight makes ...

4. Covering (construction) - Wikipedia

   en.wikipedia.org/wiki/Covering_(construction)

   DTU 40.22 Canal Clay Tile Roofing; DTU 40.23 Flat Clay Tile Roofs; DTU 40.24 Concrete Tile Roofing with Sliding and Longitudinal Interlocking; DTU 40.241 Concrete Flat Tile Roofing with Sliding and Longitudinal Interlocking; DTU 40.25 Concrete Flat Tile Roofing; DTU 40.35 Ribbed Sheet Roofing from Coated Steel Sheets; DTU 40.36 Pre-painted or ...

5. Flashing (weatherproofing) - Wikipedia

   en.wikipedia.org/wiki/Flashing_(weatherproofing)

   Shaped like a “U” or channel to catch water (e.g., where the edge of a tile roof meets a wall). Through wall flashing Spans the thickness of the wall and directs water to weep holes. Cap flashing (drip cap) Often used above windows and doors. Drip edge A metal used at the edges of a roof. Step flashing (soaker, base flashing)

6. Underlay - Wikipedia

   en.wikipedia.org/wiki/Underlay

   Underlay is also the term for the material under roofing tiles; [1] this roofing membrane is often made of rubber and is used to seal the roof and prevent leakage. Underlayment used with roofing shingles provides a second layer of water proofing to prevent leaks and is called tar paper , roofing felt , or since the 1990s synthetic underlayment.

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   www.aol.com/lifestyle/ancestrydna-kits-are-just...

   AncestryDNA kits are incredibly fun to do, and if you haven't gotten one yet, they're only $39 right now.