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1520.1 General. Spray-applied polyurethane foam may be applied directly to an existing built-up roofing system when the completed assembly is a Class A, B or C roof covering that meets the criteria in Section 2602.5.3. When applied on a fire-resistive roof-ceiling assembly, the completed assembly shall comply with Section 710.1.
1. That the roof structure is sufficient to sustain the weight of the additional dead load of the roof covering.
2. The existing roof covering is securely attached to the deck.
3. The roof deck is structurally sound.
4. The existing insulation is not water soaked.
1520.3 Preparation of Roof and Application of New Covering.
1520.3.1 General. When reroofing without removal of existing roof coverings is permitted by the building official and when the conditions specified in Section 1520.2 above have been met, the reroofing shall be accomplished in accordance with this section.
1520.3.2 Over gravel-surfaced roof coverings. Over gravel-surfaced roof coverings, the roof shall be cleaned of all loose gravel and debris. All blisters, buckles and other irregularities shall be cut and be made smooth and secure. The completed assembly must meet the conditions set forth in Section 2602.5.3, and Section 710.1, when applied on a fire-resistive roof-ceiling assembly.
1520.3.3 Over smooth or cap-sheet surfaces. Spray-applied polyurethane foam roofing may be applied directly to a properly prepared smooth or cap-sheet surface. The completed assembly must meet the conditions set forth in Section 2602.5.3, and Section 710.1, when applied on a fire-resistive roof-ceiling assembly.
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