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Glossary of DIY Home Improvement Terms - J

This page of our online a to z glossary of DIY home improvement terms is for do-it-yourself terms beginning with the letter 'J'.

• Jamb - The top and two sides of a window or door frame.
• Jig saw - Power saw for making curved cuts in timber and man-made boards.

  
  
  A jig saw

• Joint - To fit materials together; the place at which parts are joined together; method of fastening wooden parts together.
• Jointing - The way in which exterior mortar joints between brick or stone are finished.
• Joists - Wood or metal beams used to support floors and ceilings horizontally.
• Jumper (plumbing) - Washer mounting in a tap assembly.
• Junction box - A distribution box where connections for several wires are made.