diff --git a/library/check_flavors.py b/library/check_flavors.py
index ae5862099..a140f421f 100644
--- a/library/check_flavors.py
+++ b/library/check_flavors.py
@@ -139,14 +139,15 @@ def validate_roles_and_flavors(roles_info, flavors):
                         if not custom_resource_class:
                             errors.append(resource_class_missing.format(
                                 flavor_name))
-                        if not custom_resource_class_val:
+                        if key not in ["DISK_GB", "MEMORY_MB", "VCPU"] and \
+                                not custom_resource_class_val:
                             errors.append(resource_class_value_incorrect.
                                           format(flavor_name))
                         disk = resource_specs.get("DISK_GB", None)
                         memory = resource_specs.get("MEMORY_MB", None)
                         vcpu = resource_specs.get("VCPU", None)
-                        if any(int(resource) != 0 for resource in [disk, memory,
-                               vcpu]):
+                        if any(int(resource) != 0 for resource in [disk,
+                               memory, vcpu]):
                             errors.append(disable_standard_scheduling.
                                           format(flavor_name))
 
diff --git a/library/verify_profiles.py b/library/verify_profiles.py
index 58e81e6f3..1ff0bf8ba 100644
--- a/library/verify_profiles.py
+++ b/library/verify_profiles.py
@@ -109,7 +109,7 @@ def verify_profiles(nodes, flavors):
 
         assigned_nodes = [uu for uu, caps in free_node_caps.items()
                           if caps.get('profile') == profile]
-        required_count = scale - len(assigned_nodes)
+        required_count = int(scale) - len(assigned_nodes)
 
         if required_count < 0:
             warnings.append('%d nodes with profile %s won\'t be used '
diff --git a/releasenotes/notes/consider_existing_resources-addc5b2527d9db1b.yaml b/releasenotes/notes/consider_existing_resources-addc5b2527d9db1b.yaml
new file mode 100644
index 000000000..b710b9199
--- /dev/null
+++ b/releasenotes/notes/consider_existing_resources-addc5b2527d9db1b.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Existing resources "DISK_GB", "MEMORY_MB", "VCPU" were not considered to
+    be available in case of custom_resource_class_val == False, also use correct
+    types for resource comparison and required_count calculation.