Insulation is the part of a roof that nobody sees and everybody pays for, and a roof from a manufacturer that makes both membranes and insulation puts the two together in one assembly. Johns Manville supplies commercial roofing in several forms, including single-ply membranes, built-up and polymer-modified bitumen systems, and roof insulation boards, and owners in West Jordan, UT may find any of those under the surface of an older building. We install, repair and maintain systems of these types, and on a roof with this kind of build-up the first question is how many layers there are and whether any of them is holding water.
What failed first: water in the insulation
Insulation boards lose their value when they get wet, and they hold water longer than the membrane that let it in. A small puncture can wet a surprisingly wide area, because water spreads along the board joints and the top of the deck. The membrane may look sound across most of the roof while the layer beneath it is saturated.
That is why we test before we propose. A moisture survey, backed by a meter and a few small cores, outlines the wet areas and shows the board type and thickness. The results decide whether a repair can stay local, whether a recover is possible or whether the wet material has to come out. A roof with a dry core and a worn surface has options that a roof with a wet one does not.
The deck below matters too. Water that reaches a steel deck can corrode it from above, and a deck that has lost section is a safety question before it is a roofing question. When cores or a tear-off open the roof, we look at the deck surface and report on rust, deflection and fastener condition. Findings go to the owner with photographs, and any repair is priced separately as deck work.
Roof-walk notes: reading a layered roof
Built-up and modified bitumen roofs announce their condition on the surface. Blisters, ridging at laps, splits along insulation joints and thin spots where surfacing has worn away each point to a different cause. Blisters suggest trapped moisture or air. Ridges follow insulation board edges where the roof has moved. Splits mark places where the roof was stressed by temperature swings.
We walk the roof in sections, mark each defect on the sketch and photograph it. Penetrations and wall bases get a close look, since flashing in a layered system is built from the same materials as the field and fails when those materials age. Where the roof has been coated or patched, we note the repair history, because a repair on top of a repair is information about how the roof has behaved.
Surfacing deserves its own look. Gravel, mineral granules or a reflective coating protect the asphalt below from sun and traffic. Where that protection has worn away, the layers beneath age quickly. We note bare areas, measure how much of the roof is affected and recommend a resurfacing or coating where the layers underneath are still sound. This is often the least expensive way to add years to a built-up roof.
Drainage and melt: winter loads on layered roofs
Layered roofs take winter twice in the Salt Lake Valley, once as snow load and again as meltwater. Airport normals from Salt Lake City sketch the valley pattern without describing any single roof, because elevation and exposure shift from one West Jordan building to the next. What the pattern means for a roof is simple: water arrives all at once after snow, and drains and low spots decide where it goes.
Freeze-thaw also works on splits. Water in a hairline split freezes, expands and widens it, and the next melt carries more water into the layers beneath. A walk in spring, after the roof has dried, finds splits and blisters while they are small. We photograph each and compare against the last visit.
The West Jordan setting adds its own details. In the city's general plan, the Redwood Road and 7800 South core is the historic downtown and regional commercial setting, and the planned station districts include the Gardner Village area and the Old Bingham Highway area. A roof near any of them is read the same way: the walk records the layers, drains and edges on each building as they are.
Insulation upgrades and the energy code
When a replacement exposes the insulation, the energy provisions come into play. Utah's 2024 International Building and Energy Conservation Codes, effective July 1, 2026 with state and local amendments, mean an owner planning a reroof should expect the insulation level to be reviewed. Adding thickness, using tapered boards to correct slope or placing a cover board over the insulation are all common moves.
We discuss them as part of the scope: roof insulation and cover board choices change cost, performance and the way the roof drains. A cover board protects soft insulation from foot traffic, and tapered insulation can cure ponding that no patch will fix. The price of each goes on its own line so the owner can see what it adds.
Air sealing is part of the thermal picture. Gaps at the deck edge, around penetrations and at wall transitions let warm air into the roof assembly, where it can condense on cold surfaces during Salt Lake Valley winters and wet the insulation from below. A good scope seals those paths and keeps the insulation boards tight to each other, with joints staggered between layers. These details are inexpensive when the roof is open and hard to add later.
Repair boundary and warranty
A repair works on a dry roof with located defects. A recover works on a dry roof that can carry another layer. A replacement works when wet insulation is widespread. A manufacturer warranty on the roof may name who can repair the system and require notice first. The warranty is read against the roof, the scope is written to respect it, and the records go into a roof warranty management file.
Timing matters on a layered roof. Hot-applied and torch-applied bitumen methods have their own weather and safety requirements, and cold-applied or adhered methods have temperature limits. We choose the method with the building in mind: occupancy, nearby fresh-air intakes, access and the weather window. A tenant with sensitive operations may rule out a method that a vacant building would allow.
Next check: what to send
Share the address, any roof drawings or warranty papers and a description of where water appears, plus how crews get onto the roof. The walk probes for moisture and reports what the layers contain. A second building with a Holcim Elevate or Duro-Last roof gets the same walk and report, and a property in West Jordan can be scheduled around the building's operating hours.
Commercial Roofing Questions
How can I tell whether the insulation is wet?
Surface signs help, but a moisture survey with a meter and cores gives the answer. Wet areas are mapped and marked on a sketch.
What causes blisters on a layered roof?
Trapped moisture or air between layers. They are a sign to test the area before any patch goes on.
Does a cover board matter?
It protects soft insulation from foot traffic and gives the membrane a firm base. On roofs with frequent equipment service it is worth pricing.
Will the new energy code raise my replacement cost?
It can, mainly through insulation requirements. The scope states the proposed values so the cost is clear before permit review.
Who keeps the warranty?
The owner and the manufacturer, under the manufacturer's own terms. Our work is installing, repairing and recording, and the record is written so it can support a notice or a claim.
Tell us where water appears and how access works
Send the address, roof papers and leak history. We will walk the roof, test for moisture and report what the layers hold and what to do first.