Where a flat roof sits behind a front wall, it is out of sight, and a leak there can travel along a wall or a deck into a neighboring space before anyone sees a drip. Midvale established a Main Street District along Main Street from 7th Avenue to Center Street, and its form-based code is intended to preserve the street's historic character and support redevelopment. The city's concept plan also addresses streetscape elements, lighting, wayfinding and parking for Main Street businesses. A roof behind a front wall is out of sight but not out of the picture, so a roof walk here begins at the back of the parapet, where the membrane meets the wall.
The order of the walk follows the water: cap and flashing first, then the drains and scuppers, then the field, then the interior side of the wall.
What failed first: the joint behind the front wall
Where a flat roof meets a taller front wall, the membrane turns up the masonry or framing and ends under a cap or a counterflashing. That termination is the first place water gets in. Sealant dries, the cap joint opens, the top edge of the flashing pulls away and rain runs behind it into the wall and down to the ceiling.
We look at that joint along its whole length: the cap, the fasteners, the sealant, the counterflashing and the membrane turn below. We press the sealant, check for movement and photograph each section. Because the front wall is usually the building's face, the record also notes the condition of the wall just below, since staining or efflorescence there shows where water has been traveling.
Temperature plays into the same joint. The airport normals show warm summers, and a front-wall cap in full sun expands through the afternoon; a sealant bead that cannot follow that movement splits at the surface long before it looks failed from the ground. We press the bead by hand and note any that has lost its elasticity.
Roof-walk notes: shared walls and mixed construction
Old commercial blocks may share party walls, drains and sometimes whole roofs. Over time owners have added units, vents and patches that no one drew on a plan. We do not assume the construction behind a historic front; we look at what is on the roof and what the deck and walls show.
- Cap, coping and counterflashing along the front and side walls
- Party walls and the flashing where roofs of different heights meet
- Interior drains, scuppers and the paths to them
- Penetrations, vents and added equipment
- Layers of prior roofing, found by probing or a small opening
The notes go into a photo-backed condition report that the owner can share with a neighbor who shares the wall.
Drainage and melt: where the water leaves
Salt Lake City airport normals describe the valley, with winter snow, freezing nights and warm summers, and not the micro-conditions of a single Midvale block. What they support is a post-melt check. After snow clears we trace the water from the field to its exit, whether that is an interior drain, a scupper through the parapet or a gutter at the back.
A scupper through a front or side wall is a detail to watch: if it is blocked, water backs up against the wall, and if it discharges onto a neighboring roof or a sidewalk, it creates a problem somewhere else. We note where each one drains and what happens to the water when it lands. Ice that has formed at a scupper is recorded and the walk is repeated once it clears.
Where an interior drain runs through a wall cavity, a clog can overflow inside the wall without ever showing on the roof. We note any drain whose pipe path is unclear and recommend a camera or flow test before it is assumed sound.
Repair boundary: matching the street while fixing the roof
Preserving historic character is about what the public sees. A repair that changes the visible cap, cornice or roofline can conflict with the form-based code, so we ask the owner and the city what review applies before the design is set, and we match profiles and finishes where the edge is visible. Behind the front wall, the repair follows the roof's needs.
Within that frame, the usual choices apply: a contained repair with a clear boundary, a restoration of a sound membrane or a full replacement. A commercial roof repair scope names the materials, the preparation and the final inspection, and it identifies any shared-wall work that has to be coordinated with a neighbor.
The length of wall to rebuild, the layers, wet insulation, penetrations and access all feed price and schedule. The proposal lists each driver beside its evidence, so an owner and a neighbor can see why a shared-wall repair costs what it does.
Seasonal timing: sidewalks, parking and cold limits
The city's concept plan addresses parking and streetscape for Main Street businesses, which tells us the sidewalk and the parking spaces in front of a building are valued. We place the lift and the staging so that storefront entrances stay open, set noisy tasks outside the busiest hours and keep material off the walkway.
Adhesives and welds have temperature limits, so replacement work waits for warm, dry stretches, while small repairs can proceed in winter when the surface can be cleared. A replacement scope gets checked against the building department's view of the current codes for insulation and edge details.
Because the district is a mix of businesses on one street, deliveries and customers use the same curb. A short morning delivery window and a fenced corner for materials keep the work from blocking either.
Next check: what to send before the walk
Tell us where water shows up, when it appears, which neighbors share the wall and how the roof is reached. A sketch, repair invoices and any earlier photographs help us place findings.
Owners with property in the Town Center Core District or in Sandy Corners can use one record format, and a preventive maintenance visit after each melt keeps scuppers and caps in order.
A written record follows with photographs, sorted into pre-freeze work, spring work and items to watch, and with the shared-wall items marked for the neighbor.
Commercial Roofing Questions
How do you reach a roof behind a tall front wall?
Through a hatch, a ladder at the rear or a lift in the alley, depending on what the building offers. We confirm the route before the walk. Where none of those exists, a lift or a new hatch can be priced as part of the work.
Does the historic-character code limit roof repairs?
It can limit changes to visible edges and rooflines. We ask the owner and the city what review applies before the design is set. Where a front wall must keep its appearance, the work behind it is planned so the edge looks the same afterward.
What if a neighbor shares the roof or wall?
We mark the shared section on the sketch and coordinate scope and access with the neighbor through the owner. Both owners see the same photographs and the same repair line.
Why check the wall below the cap?
Staining or efflorescence shows where water has been running for some time. We photograph it from the roof and from the sidewalk so the two views can be compared.
Do you assume old buildings have masonry walls?
No. We look at what the walls and deck show and record the construction we find. Probes and a small opening tell us more than the facade does.
Start at the back of the parapet
Tell us where water shows up, when it appears, which neighbors share the wall and how roof access works. We will walk the joint behind the front wall and set a repair boundary or next test from the evidence.