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| Factor | Impact |
|---|---|
| Area | Project size affects material, labour and logistics. |
| Thickness | Higher thickness generally means more material. |
| EPDM content | Granule selection and percentage affect material and finish. |
| Binder | Binder type and quantity affect system cost and performance. |
| Base preparation | Repairs, leveling, primer and preparation can add cost. |
| Site conditions | Access, drainage, edges and transport vary by project. |