製材 is read as せいざい (seizai) and means sawing.
せいざい
seizai
せいざいこうじょう
saw mill
せいざいぎょう
lumbering (sawing) industry
せいざいしょ
sawmill
せいさく
production (of a film, play, TV show, etc.)
せいひん
manufactured goods
せいぞう
manufacture
せいやく
medicine manufacture
せいてつじょ
ironworks
せいてつ
iron manufacture
せい
make
せいず
drafting
せいさくひ
manufacturing cost