A few weeks ago I had the pleasure of sitting down with Sarah Delaney, head of classification at NBS, to talk about Uniclass 2015. It turns out that the way I have used classification on my doors isn’t exactly how it should be used, so I wanted to share with you why, and the changes I needed to make.
NOTE: Sarah has written an article on Uniclass 2015 which was a big help in getting me to understand.
Ok, a quick bit of context, what is a classification system? Basically, it is a method of classifying or categorizing objects to differentiate between them. Classification impacts everything, from the Tree of Life, and the age-old debate around Whether Jaffa Cakes are in fact Biscuits? (A debate based on avoiding VAT), to how we decide what parts of a design are the responsibility of which professionals.
In construction, there is an International standard for forming classification systems, ISO 12006-2 (you’d think I was on commission with ISO by the number of these standards I reference). It suggests how classification tables should be broken up as well as their relationships to each other. Uniclass 2015 is the UK’s latest in a series of classification systems to be created aligned to this standard. Now before any QS/Estimators
kick-off comment, I will point out that the RICS‘ New Rules of Measurement (NRM) is NOT a classification system; more on that in a future blog post.
|25||Wall and barrier|
|30||Roof, floor, and paving|
|32||Damp-proofing, waterproofing and plaster finishing|
|35||Stair and ramp|
|37||Tunnel, shaft, vessel and tower|
|40||Signage, FF&E, and general finishings|
|45||Flora and fauna|
|60||Heating, cooling, and refrigeration|
|65||Ventilation and air conditioning|
|75||Communications, security, safety and protection|
|90||Circulation and storage|
NOTE: While under Products(Pr) preparatory work is covered under Pr_15; in Activities(Ac) however, it is under Ac_10. So, as 15 has been taken by Earthwork in Systems(Ss), I have opted to use 10.
So, where did I go wrong? Put simply, I hadn’t fully understood the relationship between the tables. Which is as follows:
- Pr, Products: Things you buy (Bricks, wall ties, and Mortar)
- Ss, Systems: An element (or part of an element) made of products (Brickwork)
- EF, Elements/functions: Main building components (Walls and Doors)
- SL, Spaces/locations: Place where activities happen (Living Room and Kitchen)
- Ac, Activities: Exercising, Sleeping, Eating, Working etc. (Cleaning and Cooking)
- En, Entities: Individual assets (Just the house)
- Co, Complexes: Group of Assets (House and Garden as ‘Ty Crempog’)
What I had done was incorrectly use the Systems(Ss) table when I should have used the Elements/function(EF) table for my doors. Each of my doors were classified as Ss_25_30_20_25: Doorset systems, but this isn’t correct as they are not doorsets. As such, I have now re-classified them as EF_25_30: Doors and windows.
To remind myself, I drew this diagram.
For classification to work within Revit so that if exports into IFC, an object’s classification code and description need to be placed onto the defined property specified in the classification settings window; written as ‘Code: Description’ to comply with BS 1192-4 & COBie. As you can see from the image below I have opted for the property ‘ClassificationForObjects’. I chose this as it is the most appropriate field I could find within the IFC Schema as it is listed within IfcClassification.
And there we have it. By using Uniclass 2015 in the way that it was intended to be used, I have now improved the quality of the information I have produced and are using to managed my home; fantastic!
Operation and Maintenance
3.1 What are the sizes and condition of the windows & doors?
3.2 What assets are in a poor condition?
3.3 What costs can be attributed to my assets?
3.4 What are the most cost effective thermal improvements that could be undertaken?
Now that I classified my objects correctly, I wonder how classification will relate to costing up my preventative maintanence schedule?…