What to ask about drainage on a low-slope roof

Dekoven Roofing

November 13, 2026

Ask where water is intended to exit, what the assessment found and whether the repair scope addresses the observed condition.

Have the roofer show the intended drainage path and where water was observed. Clarify whether work ends at the roof outlet or includes anything beyond it.

Contact Dekoven Roofing to discuss a commercial roof assessment. Include the building address and the name of the person who can arrange access.

Drainage is key

Low-slope roofs rely on drains and slope.

Ask

  • Where are drains?
  • Is there ponding?
  • Are tapered insulation or crickets proposed?
  • Who clears drains?

Watch

Standing water after rain is worth documenting.

Documenting drainage

Photograph the roof 24 to 48 hours after rain and note where water remains. Mark those spots on a simple diagram and share it with the roofer.

The pattern can show whether the cause is a blocked drain, a low area or something in the deck below.

Plan

Include drainage in the scope so it is priced and warranted.

Frequently asked questions

Is ponding normal?

Persistent ponding should be reviewed.

Can drainage be improved?

Often yes.

Who maintains drains?

Agree who does.

Related: Request a commercial roof assessment

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Dekoven Roofing

November 13, 2026

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Dekoven Roofing

November 13, 2026

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Dekoven Roofing

November 13, 2026