Traditional building materials

2. The characteristic that a traditionally built wall relies on, to stop moisture reaching the inside.
7. A natural building material made from subsoil, water, straw and sometimes lime.
8. Welsh word for 'lime'
11. A type of non ferrous metal traditionally mined in Wales and used as a roof covering on public and industrial buildings.
12. Relatively fast growing timber, used in modern timber frame construction.
13. The main benefit of using a lime mortar over gypsum or cement-based mortar is that is ..........
14. Welsh word for 'copper'
17. Modern component used to cover internal walls that provides a flat surface.
18. Thin timber strips fixed between verical timbers to make traditional non load bearing partitions.
19. The material used as a binder for traditional mortars and plasters, in place of cement and gypsum.
20. Welsh word for 'slate'

1. A traditional roofing material made from dried reeds.
3. Vertical timbers used in modern partitions.
4. Term used to describe, what is meant by breathability, which allows water to enter and exit a wall easily(6,9)
5. Sometimes used to strengthen lime based plaster.
6. A very strong timber used in traditional timber framed houses that were common in the east of Wales.
9. Most traditional houses were built using materials that were sourced ---------.
10. Used for external and internal load bearing walls in traditional buildings.
15. A naturally occuring stone , that can be split into thin slices and used as a roof covering on traditional buildings.
16. A property of lime based mortar, making it less likely to crack(4,7)
17. Welsh word for 'lead'
18. A type of non ferrous metal used in early plumbing pipes, before it was discovered that it dissolves in water and is poisonous.