While the reference text specifies that bituminous or asphaltic felts are used in DPC (Damp Proof Course), it doesn't explicitly state the type of bitumen used to create those felts. Therefore, a more complete answer requires understanding the general construction context of DPC.
Generally, modified bitumen is commonly used in DPC applications, particularly in the form of bituminous felts or membranes.
Here's a breakdown:
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Bitumen's Role in DPC: Bitumen's primary function in a DPC is to create a waterproof barrier, preventing moisture from rising through walls and floors.
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Why Modified Bitumen?
- Enhanced Flexibility: Modified bitumen is treated to improve its flexibility, making it less prone to cracking due to building movement.
- Improved Durability: It offers better resistance to weathering and degradation compared to unmodified bitumen.
- Enhanced Waterproofing: It provides a more reliable and longer-lasting waterproof barrier.
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Types of Bituminous Felts: Bituminous felts used for DPC are often made using modified bitumen and reinforced with materials like fiberglass or polyester for added strength and tear resistance. These are then applied as a continuous layer using cement mortar.
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Other DPC Materials: As the reference text mentions, other materials such as metal sheets (lead, copper, aluminum) can also be used for DPC, but the question specifically pertains to bitumen.
In summary, while the specific type of bitumen isn't named in the provided reference, modified bitumen is generally the type utilized in bituminous felts and membranes employed for Damp Proof Courses due to its enhanced properties.
