Some of the cost planning and life cycle software is used to best advantage when you use the BRE materials from the IMPACT libraries. These can be copied from the IMPACT library to your project. Often they can be used in a non-composite layer just like any other materials. However some of these materials have extra validation rules imposed:
Extra validation rules when editing BRE materials
Percentage change from original material
The service life, density, adjustment percentage and site wastage percentage must not differ by more than 10% from the original library material from which this project material was copied.
The user is allowed to enter a justification for not conforming to this rule.
Transport distance
If the transport distance has been modified compared to the original library material from which this project material was copied, the user must confirm that all future added project materials will have user entered transport distances.
The user is allowed to enter a justification for not conforming to this rule.
Extra validation rules when editing BRE constructions
Appropriate material
Each BRE material has an allowed construction categories list (e.g. Roof) for which it is allowed to be added as a layer. Any BRE material used in a layer (or composite sub-layer) of this construction you are editing, must include the construction’s category in its allowed construction categories list:
The user is allowed to enter a justification for not conforming to this rule.
Valid co-layer
This is the most complex validation. Some (but not all) BRE materials have a list of valid BRE Category 1 or 2 IDs required in co-layers (i.e. the other sub-layers in a composite layer). This means that each material that needs valid co-layer materials (i.e. has a list of valid BRE Category IDs) must be used in a sub-layer of a composite layer in the construction, and that the other sub-layers in the same composite layer must match all of, and only, the valid materials in that list. Several validation checks are carried out on the materials in this construction:
a. Each material that needs valid co-layer materials must be in a composite layer.
b. Each co-layer must use a real material.
c. Each co-layer material must have a valid BRE Category ID.
d. All valid co-layer material BRE Category IDs must be present in one and only one co-layer.
e. No other materials must be present in the composite layer.
The user is allowed to enter a justification for not conforming to this rule. This is particularly important as there are some combinations of co-layers that are impossible to satisfy.
BRE Category 1 and 2 IDs are shown as columns in the materials dialog. The “P” types are Category 1 IDs, and the “L” types are Category 2 IDs.
Hint – sort on the appropriate column to make it easier to search for a required co-layer material. E.g. a type “L61” is required here, so click on the column header for Category 2 ID to sort these into alphabetical order to make it easier to see materials with this Category 2 ID.
Percent change in co-layer service life
The service life of all BRE materials must be the same to within 10% for all co-layers in each composite layer:
The user is allowed to enter a justification for not conforming to this rule. Again, the contents of the BRE database make it sometimes difficult to conform.
Adjustment percentage total
BRE materials to be used in co-layers have an adjustment percentage. E.g. brick and mortar would be maybe 90% and 10%. This validation checks that the total adds up to 100%.
The user is allowed to enter a justification for not conforming to this rule. Again, the contents of the BRE database make it sometimes difficult to conform.
