Under-Deck Drainage

Related terms

• Joist

  One of the repetitive horizontal members that support a floor or ceiling, spanning between beams or walls. Joist size, spacing, and direc…

• Vinyl Siding

  Interlocking PVC panels — the most economical, low-maintenance cladding. Quality varies by panel thickness; must be hung loose to move wi…

• Tropical Hardwood (Ipe)

  Dense, durable hardwood decking (ipe, cumaru) that lasts decades but is heavy, hard to fasten, costly, and needs sourcing diligence.

• Water Table / Belt Course

  A projecting horizontal trim that visually breaks a tall wall and sheds water at a transition between siding types or stories.

• Trim / Casing (Exterior)

  The boards around windows, doors, and corners (wood, PVC, composite). PVC/composite trim resists the rot that plagues painted wood trim.

• Weather-Resistive Barrier (WRB)

  House wrap or building paper behind the siding that drains incidental water and blocks air while letting the wall dry. The wall's seconda…

• Thermal Movement (Composite)

  Composite/PVC boards expand and contract with temperature more than wood; gapping and fastening must follow the maker's spec or boards bu…

• Weep Hole / Weep Screed

  Drainage outlets at the base of brick veneer or stucco that let trapped water escape. Blocked weeps trap moisture and rot the wall.