Glossary

double vault

A vault, usually domical, consisting of an inner shell separated from a higher outer shell.

Glossary

double tenons

1. Two tenons, side by side, at one end of a member; also called a divided tenon. 2. Two tenons,

Glossary

double-lock seam

A type of seam between the edges of adjacent metal sheets; formed by making a double fold, then dressing down to form a

Glossary

double header

A header joist made of two pieces of lumber, fixed together by bolts or nails, to provide greater strength than a single

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