1 adverbs to describe how to matchboarding

The roof has a single matchboarding inside, but on the outside is a matchboarding, then a layer of 2-ply 'ruberoid,' then a layer of quilted seaweed, then a second matchboarding, and finally a cover of 3-ply 'ruberoid.'

1 adverbs to describe how to  matchboarding  - Adverbs for  matchboarding