maximum span for lintel
2. 2.4 Metres. 3. 3.6 Metres. In the case of no 1. (2.7 M wide span) it has the inner leaf of blocks on the flat therefore this lintel will be 225mm wide. In the case of the outer leaf it will be a 100mm wide lintel.All that is over this is approx 5 courses of block and then the roof.Will a prestressed concrete lintel do this job.. 2.4 Metres. 3. 3.6 Metres. In the case of no 1. (2.7 M wide span) it has the inner leaf of blocks on the flat therefore this lintel will be 225mm wide. In the case of the outer leaf it will be a 100mm wide lintel.