Vinyl membranes can also be used in waterproofing applications for roofing. Credits associated with reflective roofing or planted roofs can help a building achieve LEED certification. Fiberglass is wetlaid into mats for use in roofing and shingles. The technique of making durable hardwood roofing shingles was also developed. Owens Corning is a global company that develops and produces insulation, roofing, and fiberglass composites. The concrete flat roofing around the domes is covered with asphalt. The firm is also a major manufacturer of asphalt used for paving and roofing applications. The main application areas are roofing and cladding. There are four types of roofing asphalt. Roofing and repair work was done in 12,652 residential homes. Shingle is a corruption of German schindle (schindel) meaning a roofing slate. Builders employed a variety of roofing methods. Shallower slopes require asphalt rolled roofing, or other roofing treatment. In more restrictive areas, houses' roofing, paint colors, and landscaping are regulated. Flashing is used to seal the gap between the chimney and roofing material.