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Seal design also varies, with common designs being single-acting, double-acting, and U-cup seals
hydraulic ram oil seals. The choice depends on the specific application requirements, such as pressure, speed, and duty cycle. Additionally, some advanced designs incorporate anti-extrusion rings to prevent seal deformation under high pressure.

2. Determining Coverage Each bundle of shingles covers a specific area, typically around 33 square feet for asphalt shingles. Therefore, understanding shingles per bundle helps in assessing how many bundles are required to cover an entire roof. This is especially important for larger roofs where miscalculating materials can lead to delays and increased costs.
shingles per bundle 3 tab

- Reduced Lifespan Granules serve to protect shingles from ultraviolet rays, which can cause the underlying asphalt to deteriorate
. Without this protective layer, the lifespan of the roof is significantly reduced.