K values and U values

This part tests your knowledge of K values and U values, thermal resistance and construction.30 marks, about 1-2 pages in total

Part Two:
This part applies your knowledge of improvements that can be recommended for two subject properties in respect of their thermal insulation and energy leakage and /or requires you to locate a suitable property and subject it to the energy efficiency check that is available on the Energy Savings Trust website and comment on both the data required and results provided.

We are looking for evidence that you have assimilated the learning material and understand the principles and practice of insulation, heating systems, U values and so on. You need to cite the sources of your research that support what you say and provide a reference list using Harvard. See below for more details of each task.

Instructions and Marking Criteria
This exercise should only be completed once you have read the appropriate sections of the Construction Web Site and completed the relevant sections of the distance learning.

A standard Faculty marking scheme is on the last page of this document. In order to achieve a good pass, say 65%, the work must be:

• Complete -There should be no gaps – it is better to attempt a question and get it wrong rather than leave it out.
• Correct -The answers should be technically correct.
• Comprehensive -Answers should directly address the question and should be well argued and articulate.
• Well illustrated -All sketches and drawings should be annotated.
• Well presented -Your submission must be well presented, well structured and written in good English

It is very difficult to give guidance on overall length for a report of this type – but I suspect the finished report (excluding the Home Energy Check attachment) would probably be 8 pages or so using the standard coursework template (see BlackBoard site).

If you do not understand specific questions or require technical assistance contact Samantha2.Organ@uwe.ac.uk as she will be marking this assignment. Please note that the programme shows specific dates when formative work can be submitted for comment. Formative work will not be awarded a mark but we will make sure that you have not gone off in the wrong direction and give advice that might raise your mark by a classification band. We can’t advise on how to turn a 33% into a 73%

Much of the information needed can be sourced from the construction website but you MUST also draw on other sources where appropriate by citing a range of references using Harvard. Examples of alternative sources can be textbooks, BRE documents, and material from the Energy Saving Trust or manufacturers of building products such as insulation or boilers.

The drawings included with this brief shows two different properties

Property A: 1930s End of Terrace

Property B: 1930s End of Terrace with garage.

You are required make reasonable assumptions where information is limited but these should be explained.


1. Explain the nature of U and K values, how they differ and their relationship with the notion of ‘thermal resistance’.

2. Work out the existing U value for the side wall of both properties.

Part Two:Answer question 3, and then either question 4, OR 5: 70 marks, 35 marks each question.

3. With the aid of neat annotated sketches evaluate the appropriate options for insulating the side wall to each of the properties. Which approach would you recommend in each case, and why?
4. A) With the aid of neat annotated sketches explain generally accepted good practice when insulating the roof in the following circumstances:

i. Property A: As a cold roof but with decking for storage
ii. Property B: As would be required as part of a conversion of the attics to include additional bedroom accommodation

B)Installing loft insulation will improve energy efficiency but can cause other expected problems. Explain these and illustrate how issues can be avoided.

5. The Energy Saving Trust’s (EST) web site allows you to carry out a Home Energy Check. This is a simplified version of the Energy Performance Certificate. (EPC)

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