Leaks at Party Walls
Flashing on a shared wall belongs to two roofs at once, and when one side fails, water reaches both buildings.


As a Pottsville commercial roofing contractor, we replace roofs on connected commercial blocks with drainage planned across every section that sheds water to the next.
Pottsville commercial roofing on a row of joined buildings has to follow the water across property lines. One roof often drains across or into its neighbor.
Before recommending work, we find every outlet, scupper, and height change along the block. Ownership lines go on the same drawing so everyone sees where water crosses.
Replacing one section can raise its height or move its outlet, which changes how the adjoining roof drains. We design for those connections even when contracts and upkeep stay separate.

Joined roofs share their troubles. These four conditions come up along most commercial rows.
Flashing on a shared wall belongs to two roofs at once, and when one side fails, water reaches both buildings.
A raised roof next door can trap water against the wall, and the lower roof floods at its edge.
Open joints in old coping let water into masonry that then shows up as stains on upper-floor walls.
Settled roofs along the back of a block often hold water where the gutter or scupper sits too high.
Old masonry flues on commercial blocks carry cracked crowns and loose flashing that leak into upper floors.
Valleys where two roofs meet hold drifted snow, and its melt runs along the wall into the lower building.
On a connected block, good drainage work helps more than the building paying for it.
Block roofs mix flat sections, parapets, and small pitched areas. These systems cover each.

Welded membrane for flat block roofs where clean flashing at party walls matters most.
TPO Roofing in Hazleton
Rubber roofing for older storefront buildings with tall brick parapets and coping.
EPDM Roofing in Hazleton
Larger plans for commercial buildings with rooftop units, exhaust fans, and service traffic.
Industrial Roofing in Hazleton
Panels for rear additions, canopies, and pitched sections behind the main block.
Commercial Metal Roofing in HazletonCall and tell us which wall or ceiling is wet. We will check the shared flashing, the outlets, and where water crosses the line.
Six steps for a roof that shares water and walls with its neighbors.
Outlets, scuppers, and height changes are found on every connected roof so the full drainage path is clear before design.
Coping, parapets, and party-wall flashing are checked from your side, with notes on what the neighbor's side needs.
New roof height, outlet size, and edge details are set so your section drains well without pushing water next door.
Fresh insulation and membrane go on, then shared walls get flashing and counterflashing tied into the masonry.
Drains and scuppers are flushed and checked so water leaves the roof the way the drawing shows.
You get a marked plan of outlets, walls, and the new roof height to share with neighboring owners who maintain the connected roofs.
Commercial roofing also covers these towns. Not on the list? Call us or send us a message.
Shared drainage, neighbors, and getting a block roof inspected.

Question about your own roof?
Call UsWhere water crosses between sections, yes. Outlets, height changes, and ownership lines all go into the design, because replacing one roof can change the next roof's water route even when contracts and upkeep stay separate.
Yes. Storefronts, offices, and mixed-use buildings on a connected block are common jobs. We inspect your roof and the shared walls, and show you where your work affects the building beside it.
Call or send a message with the address and which walls or ceilings show water. We walk the roof, the parapets, and the outlets, then send a written scope. If neighbors share the drainage, we note which of their outlets and walls affect your section.
Small roofs on connected buildings are often the hardest to drain, and we take them on. A compact roof between two taller walls can need more flashing work than its size suggests. Wall flashing on two or three sides, a single outlet, and tight access all land on a few hundred square feet.
That depends on property agreements between the owners, which we do not settle. We document where the water enters and which flashing failed, so both owners have the facts. The record includes photos of the wall, the flashing on each side, and where the stain appears inside.
Plenty of blocks are reroofed one building at a time. The new roof has to tie into the old ones at shared walls without trapping water, so we flash each party wall to your side, keep outlets clear of the neighbor's roof, and record what condition their edge was in.
Tell us about the block, the shared walls, and where water shows up. We will inspect the roof and plan drainage that works for your section.