Conversation so far:
What kind of materials did Laurie Baker use?
Laurie Baker used local matrials.
How did Laurie Baker do the brick walls?
Baker made many simple suggestions for cost reduction including the use of Rat trap bond for brick walls.
Was air able to circulate in Laurie Baker's buildings?
Baker would use natural air flow to cool the buildings' interior.

Question: Was saving money on materials importat to him?
Self-contained rewrite: Was saving money on materials important to Laurie Baker?