i am looking to add a new 1st floor doorway through the old gable end wall of my house into an extension, this will involve setting of a 1.2 long cavity wall lintel to give a 900mm opening. I've been reading the BS5977 standard for lintel loads to determine what loads i need to consider and as this is on the 1st floor i think i only need to consider the roof, masonry and self weight of lintel, the latter two are easy but calculating the roof loads is very confusing, has anyone completed calculations for a similar scenario??
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