Tangible building material (8)
I believe the answer is:
concrete
I believe this clue is a double definition.
'tangible' is the first definition.
(associated in meaning)
'building material' is the second definition.
(concrete is a kind of building material)
(Other definitions for concrete that I've seen before include "Specific - building material" , "Real, not abstract" , "Unsightly building material" , "Actual - stuff made with cement" , "Specific; definite" .)