Your friend requires a design for a home extension and as you work as an assistant in an architectural practice they have asked you. Explain the principles of superstructure design to your friend....

Your friend requires a design for a home extension and as you work as an assistant in an architectural practice they have asked you. Explain the principles of superstructure design to your friend. During the process of producing the extension design your friend asks about the finishes and the methods of construction proposed for the roof and walls. Write a short explanation for your friend. The following is proposed for the extension:

• three layer felt built up flat roofing

• 300 mm width blockwork cavity walls with fully filled cavity and rendered exterior.

Justify the selection of suitable materials and the technique proposed. Evaluate the use of these proposed materials for the wall and roof and explain how their use impacts on the environment.