When deciding between membrane waterproofing and liquid waterproofing for your roof, here are four important criteria to consider:

1. Application Method: Membrane waterproofing usually involves applying sheets or rolls of waterproof material, which requires precise installation to avoid seams and potential leaks. Liquid waterproofing is applied as a liquid, creating a seamless and uniform coating, ideal for roofs with irregular shapes or hard-to-reach areas.
2. Durability and Flexibility: Membrane systems, such as bituminous membranes, are highly durable but may have limited flexibility, especially in extreme temperatures. Liquid waterproofing, like polyurethane or elastomeric coatings, offers superior flexibility, adapting to roof movements due to temperature changes or structural shifts.
3. Cost and Installation Time: Membrane waterproofing can be more labor-intensive and require longer installation times, leading to higher costs. Liquid waterproofing, on the other hand, is typically quicker to apply and can be more cost-effective, especially for complex roof designs.
4. Maintenance and Repair: Membrane waterproofing may require regular inspections, particularly at seams and joints, to prevent water infiltration. Liquid waterproofing provides a continuous, joint-free barrier that minimizes maintenance needs and simplifies repairs, as new liquid layers can be easily applied to damaged areas.

By evaluating these factors, you can determine whether membrane or liquid waterproofing is the better fit for your specific roofing needs.