How to renovate a PVC roof

It is advisable to refer to the \"Code for Fire Protection Design of Buildings\": Some of the requirements are as follows: Buildings with a fire resistance rating of grade 2 have a mixed structure consisting of steel structural roof trusses, reinforced concrete columns, or brick walls； 3.2.12 Except for Class A and B warehouses as well as high-rise warehouses, for the non-load-bearing exterior walls of buildings with fire resistance ratings of Class I or II, when non-combustible walls are used, their fire resistance limit shall not be less than 0.25 hours ； When non-combustible walls are used, it should not be less than 0.50 hours. For the non-load-bearing exterior walls of above-ground factories (warehouses) with fire resistance ratings of Class 1 or 2 and belonging to Fire Classes D or E, with 4 floors or fewer, the fire resistance limit is not restricted when non-combustible walls are used. 3.2.13 For the partition walls in rooms within factories (warehouses) with a secondary fire resistance rating, if flame-retardant walls are used, their fire resistance limit shall be increased by 0.25 hours. 3.2.14 In multi-story factories and warehouses with a secondary fire resistance rating, floor slabs made of prestressed reinforced concrete shall have a fire resistance limit of not less than 0.75 hours. 3.2.15 For the walkable flat roofs of factories (warehouses) with fire resistance ratings of Class I and Class II, the fire resistance limit of their roof panels shall be not less than 1.50 hours and 1.00 hour respectively. 3.2.16 The roof panels of factories (warehouses) with fire resistance ratings of Class I and II shall be made of non-combustible materials. The roof waterproofing layer should be made of non-flammable or flame-retardant materials. When flammable fire-resistant materials are used and laid on flammable or flame-retardant insulation materials, a non-flammable material should be used as a protective layer for either the waterproofing material or the flammable/flare-retardant insulation material. It can be seen that the PVC panels at this level may need to be replaced ； You can specifically ask more professional organizations ；

The steel structure frame can be coated with fire-resistant paint; however, to achieve a second-level fire resistance, a thicker coat of such paint is required, which makes it more expensive； Another method is to use walls to enclose the framework within the wall structure ； The PVC panel needs to be replaced.