Which valley type is fully laced and should be applied alternately to both sides?

The woven valley type is characterized by the interlacing of shingles or other roofing material from adjacent slopes, creating a visually appealing and functional design. This method involves laying the shingles from each side of the valley so that they overlap each other in a "woven" pattern. The alternating application to both sides not only enhances the aesthetic appeal but also contributes to the effective drainage of water down the valley, minimizing the risk of leaks and potential water damage.

The woven design is particularly advantageous because it allows for flexibility in handling slight variations in material thickness and flattening potential discrepancies at the valley base, ensuring a more robust connection between the two roof slopes. This strength is crucial during inclement weather, where proper water runoff is essential.

Woven valleys are often preferred in residential roofing for their balance of appearance and waterproofing efficiency. Understanding this type of valley helps contractors make informed decisions about roofing types based on both functional requirements and visual styling.