Positive re‑waterproofing with 2K PU/Polyurea; SBS under screed for protected systems. Detail parapets, thresholds, drains. If top can’t be opened, consider hydrophilic PU injection from below as interim. Pond test and record DFT.
LQ-TERRACE
Terraces content consolidated into Roof Leakages. Use Roof & Terrace Leakages for parapets, thresholds, drains, and terrace membranes.
Summary
Terrace leakages are exposed to UV, heavy rains, and thermal cycling. Failures show at slab cracks, parapet terminations, and penetrations. Treat with durable positive‑side membranes; use negative‑side injection only when top is inaccessible.
Symptoms
- Damp ceiling below terrace after rains
- Seepage near parapets, pipe cut‑outs, and door thresholds
- Ponding marks; blistered or cracked coatings
Probable causes
- Aged/rigid membranes bridging moving cracks
- Poor termination into chases at parapets and thresholds
- Penetrations not reinforced; inadequate slope to drains
Solution paths
- Positive‑side re‑waterproofing (PU/polyurea/SBS under protection)
- Local detailing with PU sealant + membrane bandage
- Negative‑side hydrophilic PU injection if top cannot be opened
Recommended technologies
- 2K PU (hand) or spray PU; Polyurea for fast, heavy‑duty areas
- SBS membranes under screed/tiles
- Injection Grout for running leaks from underside
Quick SOP
1) Survey and mark cracks/joints/penetrations; verify slope.
2) Grind/clean; fillet upstands; prime; reinforce corners with geotextile.
3) Apply chosen membrane to spec DFT; chase‑cut terminations; protect with screed/tiles or wear coat.
4) 72‑hr pond test; sign‑off.
QA / acceptance
- DFT log per pass; adhesion ≥1.0 MPa; pond test pass
Video Masterclass
SpecX Masterclass: Terrace Leakages Solutions — Coming Soon
Disclaimer
SpecX is an industry initiative & a neutral resource, compiled from industry references and best practices. It is not brand-specific. Always cross-check with project requirements and local codes before finalizing specifications.