Proposals for Rehabilitation of Operated Combined Insulated Rolled Roofs

Abstract

Combined insulated rolled roofs, all layers of which are sequentially laid on the supporting structure and covered with a waterproof carpet, make up more than 80 % of the roofs of residential and public buildings in operation and under construction. Such a significant number of structures with a combined roll roofing in the Republic of Belarus is due to the fact that in the early 70s of the last century, a program for the development of prefabricated housing was launched in the Soviet Union. As practice has shown, after three to five years of operation, the combined insulated roll roofs needed current repairs – to eliminate leaks. The repair basically boiled down to the gluing of additional layers of rolled waterproofing material in the areas of roof leaks. Field studies have allowed us to establish the reasons why, in less than 10–12 years of operation, the combined insulated rolled roofs need major repairs. The analysis of the results of field studies has shown that the main factor affecting the failure of the roof is the high humidity of the insulation material. The main reason for moistening the material of the thermal insulation layer during the operation of the roof is the destruction of the vapor barrier layer. Based on the results of the performed field studies and regulatory documents of the Republic of Belarus, the authors of the publication offer a constructive solution and technology of work for the rehabilitation of operated combined insulated rolled roofs. The mainadvantages of the proposed solution are: provision of any thermal resistance to heat transfer of the combined coating without dismantling the structural elements of the existing roof; use of PVC membranes as a water-insulating carpet, which will allow to eliminate roof leaks within 20 years of operation without additional costs.