Sub-Surface Roof Deck Waterproofing & Flashing Replacement in Clairemont
A deep structural look at what happens beneath flat roof membranes and how custom deck flashing prevents costly interior ceiling damage.
1. Homeowner's Starting Problem
A home with a low-slope roof addition experienced mystery dampness around drywall seams during heavy rainfall events.
2. Field Inspection Findings
The underlying plywood seam tape had disintegrated due to poor drainage pitch and improper original perimeter metal flashing installation.
Work Performed & Construction Details
- Stripped old low-slope membrane down to the structural framing.
- Added tapered insulation crickets to force positive water drainage toward scuppers.
- Replaced rotted fascia and rim joists.
- Laid commercial-grade torch-down cap sheet system with reinforced base ply.
Project Visual Documentation
Visual evidence verified against site records.
Before / Starting ConditionCompleted ResultMaterials & Documentation
- Polyglass SBS Modified Bitumen Membrane
- Tapered Polyiso Insulation Board
- Heavy-Duty Copper Wall Counter-Flashing
Field Challenge Handled
Achieving proper drainage slope without increasing overall roof perimeter height past existing sliding door thresholds.
Practical Takeaway for San Diego Homeowners
Waterproofing low-slope San Diego roofs is 90% about drainage design and flashing details rather than the surface material alone.
Interested in Similar Remodeling Services?
For detailed service specifications, pricing options, and to request a free estimate on your property, visit Coast Remodeling Services on our main website.