Brief analysis of the problem of SBS membrane roof construction

Here’s a more active, streamlined version of your points:

1. Installing an SBS membrane requires a precise base with smoothness and moisture content below 9%. This standard is difficult to achieve in practice, making it challenging to maintain quality during construction.
2. Waterproofing projects typically require 5 to 7 days to dry under sunny conditions, with longer drying times in shaded areas or rain. Halting operations for such long periods is often impractical for contractors.
3. Some foundation pits have high humidity, making it difficult to keep concrete moisture below 9%. When it exceeds this, a moisture barrier is needed, but unpredictable moisture levels often lead to skipping this step, causing SBS membranes to fail, especially on vertical walls. Backfilling can also bury and detach the SBS layer.
4. SBS membranes are applied using a blowtorch for heating and a gloved hand to press them onto the substrate. Height differences of up to 8mm in some areas require precise thermoforming at sharp angles. With migrant laborers and limited supervision, ensuring seamless application over long seams is challenging, and small detachment can cause leaks.
5. Sealing SBS membranes around wall pipes is difficult due to the challenge of achieving a continuous bond.
6. The SBS membrane relies on empty paving lines for bonding. A single leak can cause significant water migration, compromising the three waterproof layers and making repairs difficult.
7. Installing the SBS membrane requires an open flame, creating fire risks. Many regions now prohibit gasoline burners for hot melting bitumen in underground spaces, deep foundation pits (≥5 meters), or near flammable materials.
8. During or after construction, SBS membranes emit toxic volatile gases like benzene and xylene, which are carcinogenic.