Many problems can occur over time with torch on flat roofs that will allow water to penetrate the boards below, and eventually into your property.
Whether splitting as occured through puddling of water, warm weather heating and expanding the bitchumen felt or through debris impacting the roof, if caught early enough, we may be able to carry out some maintenance that will help prolong the lifespan of the roof.
This can be done by sealing any cracks with bitchumen before they get any worse or by using torched on felt patches to repair any areas that are already causing internal water damage. We would then advise coating your whole roof area with solar reflective paint. This acts as a barrier from all types of weather conditions, from direct sunlight to snow and ice, and as a rule, your flat roof should be recoated annually with this paint if you want the maximum life out of your roof.