historic philadelphia rowhouse brick party wall water seepage caused mold - neighbor won't fix roof, what are legal options?

Question

own a 3-story brick rowhouse in philadelphia (rittenhouse square). our adjoining neighbor has a leaking parapet roof drain that is dumping rainwater directly inside our shared structural brick party wall.

water is seeping into our 2nd-floor bedroom drywall, causing black mold and plaster bubbling. neighbor is non-responsive and refuses to repair their roof drain.

how do we remediate the mold on our side of the brick party wall, and what legal emergency mechanisms exist under Philadelphia Department of Licenses & Inspections (L&I) to compel the neighbor to fix their leak?

Antonio · Accepted Answer

Direct Answer:  You have a two-pronged strategy: (1) file an emergency structural complaint with the Philadelphia Department of Licenses & Inspections (L&I) under Section A-401 of the Philadelphia Property Maintenance Code (which issues daily fines and emergency repair orders to adjoining owners), and (2) remove water-damaged drywall on your side, treat bare brick with a breathable silane-siloxane crystalline waterproofing barrier, and install an isolated moisture-resistant drywall assembly with a 1-inch air gap. 
 In historic Philadelphia rowhouses, shared party walls consist of two to three wythes of soft common brick. When a neighbor's roof drain fails, water travels laterally through the shared brick matrix. Applying standard drywall directly against wet historic brick traps water, cultivating  Stachybotrys  and causing wood joist pockets to rot. 
 The 3-step Philadelphia party wall remediation protocol: 
 
    L&I Emergency Inspection Request:  Request an inspector cite the neighbor for illegal water drainage into a shared party wall. 
    Cavity Bio-Remediation:  Strip contaminated plaster and drywall, HEPA scrape brick, and apply EPA botanical biocide. 
    Breathable Hydrophobic Sealing:  Apply potassium silicate sealer to your side of the brick party wall. 
 
 Call our Philadelphia emergency restoration team at  (855) 215-6261  for immediate dispatch.

brian_t_gc · Answer

As a GC who works on Center City rowhomes: L&I takes party wall water penetration very seriously. When L&I issues an emergency violation, the neighbor faces $1,000/day fines and usually fixes their downspout within 48 hours.

amanda_s_escrow · Answer

Make sure your environmental specialist takes detailed thermal imaging photos showing the water trail coming directly from the neighbor's parapet. That documentation is ironclad for L&I.

brian_t_gc · Answer

Update:  Had the neighbor's downspout repaired after L&I showed up, and treated our interior brick with silicate sealer. Air quality clearance test came back 100% normal today!

historic philadelphia rowhouse brick party wall water seepage caused mold - neighbor won't fix roof, what are legal options?

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