Spunbonded Polypropylene (PP)
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Maintenance and Cleaning
| Types | Maintenance / Cleaning | Cleaning Frequency |
| Spunbonded polypropylene roof tile underlay. Low water vapour resistance/ high water vapour permeability, complying with the performance requirements of ASTM D 6757-02 (in excess of minimum quoted in BS 5250 for traditional sarking felts of 50 MNs/g) | Inspection:
Annual inspection for underlay defect. |
None |
| Spunbonded polypropylene based, modified bitumen coated roof tile underlay. Medium water vapour resistance and permeability , complying with the performance requirements of ASTM D 6757-02 (similar to traditional sarking felts of 50 MNs/g) | ||
| Spunbonded polypropylene based, modified bitumen coated roof tile underlay with low to medium vapour resistance and medium to high vapour permeability |