What is this lump on roof?

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They offer a 40 year guarantee on some grp roofing systems :!:
Yeah, as long as you have the precise atmospheric air pressure, it is 21.337 degrees C, relative humidity is no greater than 20%, zero threat of rain for six days prior and hence, then yes GRP is an option.
 
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Yeah, as long as you have the precise atmospheric air pressure, it is 21.337 degrees C, relative humidity is no greater than 20%, zero threat of rain for six days prior and hence, then yes GRP is an option.
Have you come across any problems with built up felt roofing :?:
 

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