Hello BIMfans,

After previously considering my **Overall Dimensions**, **Heating Requirements** and **Internal Gains**, I am now able to complete my **Standard Assessment Procedure (SAP) **calculations** **by looking at my final three categories: **9a_Energy Requirements**, **10_Fuel Costs**, and **11_SAP Rating**.

### Energy Requirements

**Space Heating (211).**To calculate the amount of energy needed to heat**Tŷ Crempog**,**SAP**requires the previously calculated monthly space heating requirements (98) as well as my boiler’s efficiency (206). Using the**SAP Product Database**, I was able to find an efficiency rate of 76.1%. As expected, my boiler’s efficiency has a significant effect on the energy needed for space heating (211).**Total Electricity (services) (231).**In a similar vein, as my boiler was installed before 2013 I’ve had to use 120 kWh/year instead of an assumed 30 kWh/year.*This means that, in addition to any efficiency gains, I could quarter the energy use associated with my boiler by having a new one installed.***Total delivered energy for all uses (238).**Each of the calculated energy uses were collated to calculate my total delivered energy. Interestingly,**SAP**includes an opportunity to subtract renewable energy sources; making the addition of solar panel an option to consider.*However, as my roof faces east and west, this option might not be as attractive as it seems.*

My SAP calculations for energy requirements can be seen below:

### Fuel Costs

**Total Energy Cost (255).**As I am not able to choose my fuel, there isn’t much I can do to influence this cost aside from reducing my energy requirements.

My SAP calculations for my fuel costs can be seen below:

### SAP Rating

**SAP Rating (358).**After all of these calculations, I’ve come to a final value. Using the total energy cost (255) of**Tŷ Crempog**and total floor area (4), I am able to calculate the energy cost factor (357); allowing me to calculate my SAP rating (358).Months of calculations and tests have allowed me to arrive at a single number,**66.50.**My ‘official’ SAP rating you ask? 65 (*Pretty damn close if you ask me!*).

My SAP calculations for SAP Rating can be seen below:

To double-check these figures (*and increase my level of confidence*), I contacted **BRE’s Energy Team**, who were kind enough to review my calculations. After a few exchanges, I believe we have managed to spot and correct most, if not all, of the errors to arrive at a pretty realistic SAP score. This means that I am able to test scenarios and see the impact any improvements have on **Tŷ Crempog**.

Now that my calculations are complete, I am happy to share them:

7001-BBH-ZZ-ZZ-CA-Z-00001 – SAP Calculation

Having these calculations in **Google Sheets** is great because I am able to share and test these results.

It is so easy, I am issuing a challenge:

What are the most cost-effective thermal improvements that could be undertaken?

Using the structured information provided in my **Calculation Sheet** and **SAP Documentation**, what improvements can you test and suggest back? **The best suggestions will feature in next month’s blog post!!!** For example:

**Backdoor:**A new backdoor would improve (26a) from 3.00 to 1.4; increasing my SAP rating by (*an unimpressive*) 0.3.**Boiler:**A new boiler would improve (206) and (230c); increasing my SAP rating by up to six whole 6 points!

So, let your creativity flow, and see what solutions you can think of:

And there we have it. Having now completed my **SAP Calculations** using **Tŷ Crempog**‘s information model, I should now (*with your help*) be able to determine the most cost-effective thermal improvements that could be undertaken. In doing so, PLQ 3.4 will be complete!

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 my SAP rating has been calculated, Let’s see what potential improvement works you lot have suggested…

*Note: If you have any comments regarding my use of SAP, then please let me know either on **Twitter**, or by commenting below.*

Hello Dan, I’ve noticed you use six numeric digits rather than four for your file name, are you following BS1192-2 or PAS 1192-2?

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Hi J, I use five digits.

BS 1192 specifically states four, while PAS 1192-2 shows five. I have used five on purpose so that I could codify by number field. I have explained this in clause 5.3 of my BIM Execution Plan.

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[…] PLQ 3.4 – EPConclusion […]

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My first suggestion is dry-lining the walls with Alreflex 1L1 and finishing with plasterboard on battens; assuming the existing U-value of your walls is 2.1 W/m2K, adding our insulation will reduce the U-value of the walls to 0.82 W/m2K AND reduce the heat capacity per unit area of the wall to 9 kJ/m2K.

This still won’t quite comply with the requirements of Approved Document L1B, so you may need to consider insulating with 85 mm Alreflex Platinum instead to reduce the U-value to 0.28 W/m2K if the building control officer thinks that that the extra thickness required is technically feasible.

The two changes required in your spreadsheet on the 3_HeatLoss tab are:

E10 = 0.82 or 0.28 (as preferred)

G10 = 9

More information on Alreflex 1L1 and Alreflex Platinum can be found on the Thermal Economics website: http://www.thermal-economics.co.uk; or I will be happy to discuss this with you.

We’re happy to give technical advice on how our thermal insulation products affect the energy performance of buildings; including calculations for U-values and thermal bridging. Just call our technical department on 01582 544255 or e-mail technical@thermal-economics.co.uk.

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Thank you John, I have been thinking about EWI systems, but yes a VIP-esq dry lining solution could also work well. Alreflex 1L1 has a massive impact at a thickness of only 3mm

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