What type of material is applied over the upper portion of wood shakes after installation?

The upper portion of wood shakes is typically covered with 30 lb roofing felt after installation to provide an additional layer of protection against moisture and weather elements. This material acts as a vapor barrier, helping to prevent water from seeping through the shakes and into the underlying structure, which can lead to rot and deterioration over time. The 30 lb weight indicates that it is thicker and more durable than standard felt, offering enhanced resistance to tears and punctures, making it an ideal choice for roofing applications involving wood shakes.

Using tar paper, while a similar option, generally refers to a less durable material that may not provide the same level of longevity and protection under roofing installations. Fiber cement board and metal flashing serve different purposes related to structural support and waterproofing around roof edges, but they aren't typically applied over wood shakes in the same manner as roofing felt.