Working the Gangway: Masonry Repair on Chicago's Narrow Lots

There is a wall on most Chicago buildings that nobody looks at, nobody photographs, and nobody budgets for — right up until it is the reason water is coming into a bedroom.

It is the side wall, four feet from the neighbour's, reachable only down a gangway you have to turn sideways to carry anything through. And on a very large share of the buildings in this city, it is the worst masonry on the property.

Paul Lally's Masonry Inc. is a family-owned, insured masonry contractor serving Chicago and the Chicagoland suburbs since 1988 — tuckpointing, brick repair and replacement, chimney repair and rebuilds, lintel replacement, masonry restoration, and waterproofing for residential and commercial properties. Built on Craftsmanship. Backed by Experience. Free on-site estimates — call (708) 448-8866.

Why the gangway wall goes first

Four things stack up against it, and they compound.

It never dries

A narrow passage between two buildings gets very little direct sun and almost no air movement. After every rain, the front and rear elevations dry within hours and the gangway wall stays damp for days.

That matters because masonry damage is a function of how long the material stays wet, not just how often it gets wet. A wall that is still saturated when the temperature drops overnight goes through the freeze-thaw cycle with water inside it. Repeat that dozens of times a season — which is exactly what a Chicago winter does — and the mortar erodes and the brick faces spall.

It is usually the cheaper brick

On older Chicago buildings, pressed face brick went on the street elevation and Chicago common brick went on the sides and rear. Common brick was made from local clay, fired unevenly, and is softer and considerably more absorbent than face brick.

So the wall that stays wettest is also the wall built from the material least able to handle being wet.

It collects the water

Downspouts discharge into gangways constantly, often onto a splash block that moved years ago, or straight onto grade against the foundation. Concentrated water at one point on a wall, every storm, for twenty years, will take out masonry that would otherwise have lasted another century. See downspouts, grading and drainage.

Gangways also tend to slope toward the building rather than away, hold snow long after it has melted elsewhere, and trap leaf litter that keeps the bottom courses damp year-round.

Nobody sees it

Which means deterioration that would have prompted a call three years earlier on a front elevation runs unnoticed until it reaches the inside.

The access problem, honestly

Here is the part that changes how the job is priced and scheduled.

Conventional staging often will not fit. A standard scaffold frame is wider than some gangways. Even where it fits, there may be no room to walk past it with a bucket.

Material has to be carried. On a front elevation, brick, mortar and tools stage beside the work. In a gangway they come down a passage, one load at a time, sometimes from the street.

There is nowhere to step back. A mason reads a wall by backing up and looking at it. In a four-foot gangway that is not possible, so the work is checked from the ends and from the neighbour's side where access allows.

Obstructions. Meters, service lines, AC condensers, fences, hose bibs, window wells and mature landscaping are all in the way, and some of them cannot be moved.

The neighbour's property. Any staging, material or worker footprint across the line needs permission.

None of this makes the work impossible. It makes it slower and more deliberate, and that is a real part of what access contributes to any masonry cost. Our guide to height, access and scaffolding covers the general principle; the gangway is its tightest case.

How access actually gets solved

1. Narrow-frame scaffolding and sectional towers — purpose-built for tight passages, erected in sections and moved along the wall.
2. Ladder-jack and pump-jack systems where the wall and working height allow.
3. Roof-supported or suspended access for upper portions on taller buildings, where the roof structure and what is below permit it.
4. Working from the neighbour's side with permission, which is frequently the most practical answer for the upper courses.
5. Splitting the elevation — lower portion from the gangway, upper portion by another method.

Which one applies is a site decision, made at the assessment rather than discovered on the first morning.

Talking to the neighbour

This is the part homeowners dread and it is usually the easiest.

Ask early, ask in writing, and be specific: what the work is, which days, roughly how long, what will sit on their side and where, and that everything gets cleaned up and reinstated. Most neighbours agree without hesitation when they are asked three weeks out rather than at eight on a Monday morning.

Worth including:

• Dates and duration, honestly stated
• What footprint you need and for how long
• Protection for their plantings, fence, AC unit and windows
• A contact for anything that comes up
• Reinstatement — grade restored, plantings protected, gangway left clean

If the building genuinely shares a party wall rather than merely standing close, that is a different and more involved conversation about responsibility as well as access. See party walls and shared masonry.

What we find on gangway walls

A consistent list, in roughly the order it appears:

• Eroded and missing mortar joints, worst in the lower third and behind the downspout
• Spalling common brick, faces off, soft interiors exposed
• Efflorescence — white mineral bloom — proving water is moving through the wall
• Green and black biological growth on the permanently damp sections
• Bottom courses failing first, from splash, standing water and road salt tracked in
• Deterioration hidden behind the downspout that nobody could see until it came off
• Open joints at the window and door heads, where lintels are corroding out of sight
• Damp interior walls on that side of the building
• Foundation deterioration at grade, where the gangway slopes the wrong way

Our post on why one elevation is always worse explains the exposure pattern across a whole building.

Fix the water, not just the wall

Repointing a gangway wall without addressing why it stays wet is a repair with a short life. The order that works:

1. Redirect the downspout discharge — extensions, or tie it into drainage that carries water away from the building.
2. Correct the grade where the gangway pitches toward the wall.
3. Clear the passage of leaf litter and debris that hold moisture at the base.
4. Address the lintels, sills and any coping feeding water into the wall.
5. Then repoint and replace units.
6. Consider a breathable penetrating sealer on sound, repaired masonry — never a film-forming coating, which traps moisture in a wall that already struggles to dry. See is masonry waterproofing worth it.

That last point matters especially here. A gangway wall is the worst possible candidate for a coating that blocks vapour, because drying is precisely what it cannot do.

The chimney problem on a narrow lot

Worth separating out, because it is where access constraints bite hardest.

A great many Chicago buildings carry their chimney on or near the side wall, which means the stack sits directly above the gangway. Everything that makes the wall hard to reach makes the chimney harder — there is no room to set a ladder at a safe angle, nowhere to stage material, and a long carry to the roof.

It also means that anything that comes off the stack — a spalled brick, a piece of a failing crown — lands in a four-foot passage that somebody walks down to reach their back yard. That moves chimney work up the priority list on a narrow lot in a way it would not on a wide one.

The practical answer is usually roof-supported staging with proper roof protection, planned at the assessment. What it is not is somebody free-climbing off a ladder braced against a neighbour's fence. Our guides to signs your chimney needs repair and why the top of a chimney fails first cover what to look for from the ground.

Winter, and why gangway walls suffer most

Chicagoland's freeze-thaw cycle is the engine behind nearly all of this, and the gangway concentrates every part of it.

Snow pushed or shovelled into a narrow passage sits there long after the open yard has cleared, keeping the bottom courses saturated for weeks. De-icing salt tracked in from the walk collects at the base of the wall. Meltwater from the roof runs down a downspout into a passage that does not drain, refreezes overnight, and works its way into open joints.

Then the cycle repeats — thaw in the afternoon, refreeze after dark — dozens of times between December and March. Each cycle is an expansion event inside masonry that never got the chance to dry.

That is why the bottom three feet of a gangway wall is so often the worst masonry on an entire building, and why clearing the passage and getting the water out of it is genuinely half the repair. See winter masonry protection.

Materials and technique

Mortar matched in type, colour, sand and joint profile — and softer than the brick around it, which on soft Chicago common brick is not a preference but a requirement. Mortar harder than the unit drives stress into the unit and takes its face off. See type N versus type S mortar.

Replacement units matched on size first, texture second, colour third, toothed into the coursing rather than patched in as a rectangle. Gentle cleaning only — no sandblasting and no high-pressure washing, both of which strip the fired skin from brick and guarantee the next round of spalling.

Sequencing, and why it is worth doing at once

The expensive part of gangway work is getting set up in the gangway.

So if the side elevation needs repointing, and a lintel on that wall needs replacing, and the chimney on that side needs attention, doing all three in one mobilisation costs meaningfully less than doing them in three separate years. Group the work by access.

That is the single most useful budgeting principle on a narrow lot, and it is why an assessment should cover the whole elevation and everything on it rather than the one spot where water came through.

What drives the cost

Elevation area and height. The access method the site actually requires. How much of the work is repointing versus unit replacement or rebuilding. Whether matching brick can be sourced. Whether lintels, sills or a chimney are involved on the same elevation. Whether neighbour access is available. Weather windows, since mortar needs workable temperatures to cure.

We publish no figures, because a number that means anything requires walking the gangway. Free on-site estimate, in writing — call (708) 448-8866.

Go look at it this weekend

Take a flashlight down the gangway and look at the bottom three feet of wall, the area behind and below every downspout, and the joints around the windows. If the mortar rakes out with a key, if the brick faces are flaking, or if there is white bloom on the masonry, that wall is telling you something the front of your house is not.

Paul Lally's Masonry Inc. is family-owned, insured, and has been working Chicagoland's tight lots since 1988. Our name is on every job. Related services: tuckpointing and repointing, brick repair, brick replacement, lintel repair and replacement, and masonry sealing and waterproofing.

Built on Craftsmanship. Backed by Experience. Get a free on-site estimate or call (708) 448-8866.