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Porto Damp

Porto · DPC Injection

Chemical DPC injection for Pombalino granite in central Porto

Porto's UNESCO core packs thousands of granite townhouses where capillary rise reaches 1.2 m each winter. In Cedofeita and Bonfim, raised pavements bridge 1890s slate DPCs — injection restores a continuous barrier without removing terraces.

Cross-section diagram of DPC injection in granite masonry
Porto granite is dense but mortar beds are lime-rich and porous. We drill at mortar depth, not through stone faces, to protect Ribeira warehouse aesthetics.

Local masonry challenge in Porto

Ground-floor flats along Rua das Flores and near São Bento station routinely show 80–95% WME at skirting height. Atlantic rainfall exceeding 1,200 mm/year keeps soil permanently damp against foundations.

Landmarks and neighbourhoods we cover

Douro riverfront warehouses, São Bento station granite blocks, Clérigos tower vicinity

  • São Bento station granite blocks
  • Clérigos tower vicinity
  • Ribeira riverfront warehouses

What we deliver on site

  1. Moisture profile survey before drilling
  2. Mortar-bed identification on granite or brick facades
  3. 12 mm drill holes at 100–120 mm centres
  4. Silane/siloxane cream injection to refusal
  5. Hole sealing with colour-matched mortar

Typical timeline: Survey within 5 business days; injection typically 2–3 days for a standard ground-floor flat.

Local FAQ

No — we access mortar beds from inside. External azulejo facades in Sé parish remain untouched.
Allow 6–8 weeks dry-down in central Porto. We provide meter readings before sign-off.

Full service specification → · All services in Porto · Treatment cost guide

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