diff --git a/hub/exports/building_energy/insel/insel_monthly_energy_balance.py b/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
index 1824cdbe..7bd2065d 100644
--- a/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
+++ b/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
@@ -176,15 +176,15 @@ class InselMonthlyEnergyBalance(Insel):
 
       file = Insel._add_block(file, i_block, 'polyg', inputs=inputs, parameters=parameters)
 
-    i_block = 300
+    i_block = 300 + len(surfaces)
     inputs = ['4.1', '4.2']
     file = Insel._add_block(file, i_block, 'cum', inputs=inputs)
 
-    i_block = 303
+    i_block = 303 + len(surfaces)
     inputs = ['300.1', '300.2']
     file = Insel._add_block(file, i_block, 'atend', inputs=inputs)
 
-    i_block = 310
+    i_block = 310 + len(surfaces)
     inputs = ['4.1', '4.2']
     parameters = ['1 % Mode',
                   '0 % Suppress FNQ inputs',