| 摘要 |
Improvements in a roof covering system include the use of flexible pouches containing heavy, dense materials such as dense oil and sand. These pouches are compressed between supports, such as parapet walls and pipes, and fixtures mounted on the supports, resulting in improved sealing against water seapage into the roof. Another improvement is in the provision of a storage tank of sealing material such as tar to help maintain the level required for adequate protection of roofing materials against adverse weather conditions. The additional provision of a wetted layer between two water impermeable layers allows for better temperature control of the roofing materials. Temperature controlled water can be circulated through this wetted layer using a system of spiralling pipes with an underground water storage area of larger spiral piping.
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