Excel Roofing has been walking small commercial roofs across Colorado and Wyoming since 1993.

This guide walks through the decision in the order that protects the building. Identify what is up there, decide whether to repair or replace, handle storm damage correctly, fix the water path, match the material to this climate, and choose a contractor with the same rigor used to choose a tenant.

First, Know What Counts as Small Commercial

Small commercial is not an official category, and that causes real confusion when owners start calling for bids. In practice, the term describes buildings under roughly 20,000 square feet of roof area that are owned or managed as income property or as an operating business location. That includes:

• Single-tenant retail, restaurants, and quick service buildings
• Small professional offices, medical and dental suites, and office condos
• Light industrial bays, contractor shops, and small warehouses
• Churches, community centers, and nonprofit facilities
• Low-rise multifamily, townhome buildings, and HOA-owned common structures
• Self-storage rows, car washes, and small mixed-use buildings

Why does the label matter? Because it determines who is qualified to do the work. A building this size frequently sits in a gap. It is too complex for a crew that only installs residential shingles, and too small to interest a national commercial roofing outfit that wants 200,000 square foot projects. You need commercial roofing services from a contractor who works comfortably at your scale and understands both membrane and steep-slope construction.

Step One: Identify Your Roof System

You cannot evaluate a bid on a system you cannot name. Before calling anyone, figure out what is up there.

Low-Slope Roofs

Building codes generally define low-slope as anything under 3 inches of rise per 12 inches of run. These roofs are not flat, and they were never meant to be. They are built with a slight pitch that moves water toward drains or scuppers. On small commercial buildings across Colorado and Wyoming, you will most often find single-ply membrane such as TPO or EPDM, modified bitumen, or an older built-up roof with gravel.

Steep-Slope Roofs

Anything at 3:12 or steeper is steep-slope, and it sheds water rather than routing it. A surprising number of small commercial properties in our region have steep-slope roofs, especially converted residential structures, professional offices designed to blend into a neighborhood, churches, and low-rise multifamily. These use asphalt shingle, stone-coated steel, standing seam metal, or tile.

How to Tell What You Have

Stand at the property line and look at the roofline. If you see a parapet wall and no visible slope, you have a low-slope roof. If you see pitched planes and gutters, you have steep-slope. Many small commercial buildings have both, which is completely normal and is exactly the situation where a single-discipline contractor gets into trouble. The transition between the two systems, where a membrane ties into a sloped section, is one of the most common leak points our crews find.

Service life figures above are typical ranges under normal conditions. Hail exposure, ponding water, poor ventilation, and rooftop equipment traffic all shorten them.

Step Two: Decide Between Repair and Replacement

Most owners want a simple rule here, and that instinct is understandable. Roof repair services cost a fraction of replacement, so repair is always tempting. Sometimes it is also correct.

Repair Usually Makes Sense When:

• The roof is in the first half of its expected service life
• Damage is isolated to a specific area, such as a failed pipe boot, a cracked seam, or storm damage to one slope
• The insulation under the membrane is dry, which a contractor can verify with a moisture scan or core sample
• You have had one or two leaks in one location rather than leaks appearing in new places each season
• The existing system was installed correctly and simply needs a defect corrected

Replacement Usually Makes Sense When:

• The roof is at or past its expected service life
• New leaks keep appearing in different locations, which indicates general system failure rather than a point defect
• Core samples show wet insulation, because saturated insulation loses R-value permanently and will keep feeding the deck moisture no matter what you patch above it
• Hail or wind damage is widespread across the field of the roof
• Seams are failing broadly, the membrane has become brittle, or shingles are losing granules across every slope
• You are stacking repair costs that are approaching a meaningful percentage of replacement cost

The Rule That Catches Owners Off Guard

Many jurisdictions in Colorado and Wyoming have adopted code language stating that if more than 25 percent of a roof area is repaired or replaced within a 12 month period, the entire roof assembly must be brought up to current code. That can trigger requirements for additional insulation, secondary drainage, or ice barrier that were not in place when the building was constructed.

Excel Roofing raises this early because it changes the math. A large repair can quietly obligate an owner to a much bigger scope. Ask any contractor bidding the project how the local code official handles this threshold in that specific jurisdiction, and make sure the answer is in writing before work starts.

Step Three: Handle Storm Damage the Right Way

Colorado and Wyoming sit in the most active hail corridor in the country. Owners here should assume storm damage is a matter of when, not if.

What Hail Does to a Commercial Roof

On membrane roofs, hail creates bruises and punctures that often are not visible from the ground and sometimes are not obviously leaking for a year or more. The impact fractures the membrane or crushes the insulation below it, and moisture works in slowly. On shingle roofs, hail knocks granules loose and fractures the mat, which shortens the life of the roof even where you do not yet see daylight.

What Wind Does

Wyoming in particular has some of the highest design wind speeds in the continental United States, and the Front Range foothills produce severe downslope wind events. Wind damage on membrane roofs typically starts at the perimeter and corners, where uplift pressure is highest. If the edge metal or the membrane termination lifts, the rest of the field can peel in a single event.

What to Do After a Storm

• Document immediately. Photograph the building, note the date and time of the storm, and keep any news or weather reports for your area.
• Get a professional inspection before you file. A qualified contractor can tell you whether damage is likely to meet the claim threshold, which saves you from filing a claim that gets denied and still shows on your loss history.
• Understand your policy structure. Replacement cost value policies pay to replace with like kind and quality. Actual cash value policies deduct depreciation, which on an older commercial roof can be substantial. Many commercial policies also carry a separate wind and hail deductible calculated as a percentage of the insured value rather than a flat dollar amount. Read that endorsement before the storm, not after.
• Have your contractor present for the adjuster meeting. Adjusters are covering a lot of ground after a major event. A contractor who can walk the roof with them and point out test squares, mechanical damage, and code-required upgrades protects your scope.
• Watch your deadlines. Most policies require prompt notice of loss and set an outside limit on when claims can be filed. Do not let a season pass while you decide.

A Word About Deductibles

If a contractor offers to cover, absorb, waive, or otherwise make a deductible disappear, walk away. Colorado law expressly prohibits roofing contractors from paying a residential insurance deductible, and offering to do it on any property, residential or commercial, signals a contractor who is comfortable committing insurance fraud. Whatever else that contractor is comfortable doing to the building tends to surface later.

Step Four: Do Not Skip Gutters and Drainage

Owners regularly spend six figures on a new membrane, leave the drainage untouched, and call two years later about the same leak in the same corner. Water does not care what was spent. It goes where the path takes it.

Low-Slope Drainage

Low-slope roofs move water through internal drains, scuppers through the parapet, or a combination. Three things are worth verifying:

• Positive drainage. Industry standard treats water that remains on the roof more than 48 hours after rainfall as ponding. Ponding voids many manufacturer warranties, accelerates membrane breakdown, and adds significant dead load. If your roof holds water, tapered insulation or added drains should be part of the replacement scope, not an upsell you discover halfway through.
• Secondary drainage. Roofs with parapet walls generally require an emergency overflow, either overflow scuppers or a secondary drain set slightly above the primary. If a primary drain clogs with ice or debris and there is no overflow, the roof holds water until something gives. This is a code requirement in most jurisdictions and it is also the single cheapest catastrophe insurance on the building.
• Drain maintenance. Strainers get crushed by foot traffic and filled with cottonwood fluff every spring. Put drain clearing on a scheduled maintenance plan.

Steep-Slope Gutters

On steep-slope commercial roofs, gutters are undersized far more often than they are damaged. Standard 5 inch residential gutter is frequently inadequate for the roof area and rainfall intensity on a commercial building. For most small commercial applications across our service area, Excel Roofing specifies 6 inch seamless gutter with oversized downspouts, and more downspouts than a residential layout would use.

Where the water goes once it leaves the downspout matters just as much. Discharge at the foundation is one of the most common causes of the moisture problems owners misdiagnose as roof leaks. Extensions, splash blocks, or tie-ins to site drainage belong in the conversation.

Freeze, Thaw, and Ice

Our climate is defined by the freeze-thaw cycle. A sunny January afternoon melts snow on the roof, water runs to a cold eave or a shaded parapet, and it refreezes. On steep-slope roofs that produces ice dams that push water backward under the shingles. On low-slope roofs it plugs drains and loads the structure. Proper ventilation, adequate insulation, ice barrier at eaves, and heat cable in problem areas are all legitimate parts of a Colorado and Wyoming roofing scope.

Step Five: Match the Material to This Climate

A roof that performs beautifully in Phoenix or Atlanta can be a poor choice here. Four regional stressors should drive your material selection.

Hail Resistance

Two rating systems make any product data sheet readable.

• UL 2218 covers steep-slope products. It rates impact resistance Class 1 through Class 4. Class 4 is the highest, meaning the product withstood a two inch steel ball dropped from twenty feet without cracking. Many insurers in Colorado offer premium credits for Class 4 assemblies.
• FM 4473 covers low-slope products. It rates hail resistance as MH for moderate hail, SH for severe hail, and VSH for very severe hail. VSH is the top tier and it is uncommon. For a building in the hail corridor, it is worth asking specifically whether a product carries it.

Stone-coated steel is worth a serious look for small commercial buildings in this region for exactly this reason. Products in this category can carry both Class 4 impact ratings and, in the case of certain systems, very severe hail ratings, alongside service life in the 40 to 50 year range. On a building you intend to hold for a decade or more, the higher installed cost frequently pencils out against a second replacement cycle and repeated claims.

Wind Resistance

Ask what design wind speed the assembly is rated for and confirm it meets or exceeds the requirement for your specific address. Wind requirements vary considerably between, for example, a sheltered site in Denver and an exposed corridor outside Cheyenne. Pay particular attention to edge metal, because perimeter detailing is where wind failures start.

Fire Resistance

Colorado has been tightening wildfire construction standards, and Class A fire-rated roof assemblies are increasingly required in wildland-urban interface areas. For properties in or near a designated hazard area, current requirements should be verified with the local building department before materials are selected. This is a fast-moving area of code, and designing for it beats being surprised at inspection.

Altitude and UV

Ultraviolet exposure is significantly more intense at our elevations, and it degrades roofing materials faster than manufacturers' national averages suggest. Membrane thickness matters here. On single-ply work in Colorado and Wyoming, Excel Roofing specifies 60 mil over 45 mil for commercial applications. The incremental cost is small and the durability difference is not.

Step Six: Choose the Contractor Before You Choose the Roof

This is the part of the decision that determines the outcome. The best material in the industry, installed poorly, will fail before a mid-tier material installed correctly. Neither Colorado nor Wyoming licenses roofing contractors at the state level, which means licensing happens city by city and the bar to call yourself a roofer is low. Verify everything.

Verify Before You Sign

• Local licensing. Confirm the contractor holds the license required in the specific jurisdiction where your building sits. Denver, Colorado Springs, Aurora, Cheyenne, and Casper all have their own requirements.
• Insurance, verified at the source. Ask for a certificate of insurance showing general liability and workers compensation, and ask that it be sent directly from the insurance carrier or agent rather than from the contractor. If a worker is hurt on an uninsured crew, the exposure can land on the property owner.
• Manufacturer certification for your specific system. Membrane manufacturers certify installers, and certification is what makes an extended manufacturer warranty available on your building. A contractor certified for shingles is not automatically certified for TPO.
• Physical local address and time in business. A permanent office in Colorado or Wyoming means someone is here to answer a warranty call in year seven. Ask how long the company has operated under its current name.
• Commercial references at your scale. Ask for three references on small commercial buildings with a roof system like yours, completed in the last two years. Then call them.
• Safety record. Ask about their safety program and any OSHA history. On an occupied commercial building, safety practices are also liability protection for you.

Understand the Two Warranties

Every commercial roof involves two separate warranties, and owners routinely conflate them.

• The manufacturer warranty covers the materials. On membrane roofs, a manufacturer no dollar limit warranty can cover both material and labor for repairs, but it is only available through certified installers and it typically requires documented maintenance.
• The workmanship warranty covers the installation and comes from the contractor. This is the one that matters most in the first several years, because the large majority of early roof failures are installation related rather than material related. Ask for the length in writing and ask what specifically is excluded.

Step Seven: Plan the Budget and the Building Logistics

Commercial roofing costs vary widely, and any contractor who quotes a firm number before seeing the roof is guessing. The factors that actually drive price are roof area, existing system and how many layers must come off, deck condition, insulation requirements under current code, the number of penetrations and rooftop units, roof access and staging space, and building height.

Two planning items owners frequently miss:

• Tenant and occupancy impact. Your building is probably operating during the work. Ask specifically how the contractor stages material, where the dumpster goes, how parking is affected, what the daily schedule looks like, and how odor and noise are managed. A restaurant with a dining room and a dental office with treatment rooms have very different tolerances, and a good contractor will plan around both.
• Capital planning. If you own the building long term, or if you sit on an HOA or association board, put roof replacement in the reserve study with a realistic remaining service life rather than a default number. Then get a professional condition assessment every few years to keep that number honest.

The Mistakes We See Most Often

• Choosing on price alone. The lowest bid is usually low because something was left out. Find out what.
• Deferring small repairs. A failed pipe boot costs very little to fix and can saturate a large area of insulation if it is ignored through a wet season.
• Skipping the moisture survey. Installing new membrane over wet insulation guarantees failure and voids warranties.
• Ignoring the drainage. New roof, same standing water, same result.
• Hiring the storm chaser. Out of state crews chase claims, not warranties, and they are not here in year five.
• Never inspecting between storms. Two inspections a year, spring and fall, plus one after any significant hail event, catch nearly everything while it is still cheap.

Frequently Asked Questions

How long does a commercial roof last in Colorado?

It depends on the system. Single-ply membranes such as TPO and EPDM typically last 20 to 30 years, modified bitumen 15 to 25 years, asphalt shingle 15 to 30 years, and metal or stone-coated steel 40 years or more. Colorado's hail frequency, intense ultraviolet exposure at altitude, and freeze-thaw cycling tend to push actual service life toward the lower end of these ranges unless the roof is maintained and the material was selected for impact resistance.

Should I repair or replace my small commercial roof?

Repair generally makes sense when the roof is in the first half of its service life, the damage is isolated to a specific area, and the insulation beneath the membrane is dry. Replacement generally makes sense when the roof is at or past its service life, leaks are appearing in multiple new locations, moisture testing shows saturated insulation, or storm damage is widespread. A moisture survey or core cut gives you an objective answer rather than a guess.

Does insurance cover commercial roof replacement after hail?

Frequently yes, though coverage depends on your policy. Replacement cost value policies pay to replace with like kind and quality, while actual cash value policies deduct depreciation. Many commercial policies carry a separate wind and hail deductible expressed as a percentage of insured value rather than a flat amount. Have a qualified contractor inspect the roof and document the damage before filing, and have that contractor present when the adjuster inspects.

What is the difference between commercial and residential roofing?

The main differences are slope, system, and scale. Commercial buildings often have low-slope roofs using membrane systems that require different installation methods, equipment, and manufacturer certifications than steep-slope residential roofing. Commercial projects also involve more rooftop penetrations, larger drainage demands, occupied-building logistics, and code requirements around insulation and secondary drainage. Many small commercial buildings have steep-slope roofs, which is why a contractor who works in both disciplines is valuable at this scale.

What size gutters do I need on a small commercial building?

Standard 5 inch residential gutter is often undersized for a commercial roof. For most small commercial applications in Colorado and Wyoming, 6 inch seamless gutter with oversized downspouts, and more downspouts than a residential layout would use, handles our high-intensity storms far better. Proper sizing depends on the drainage area feeding each run and the local rainfall intensity, so it should be calculated rather than assumed.

What is ponding water and why does it matter?

Ponding is water that remains on a low-slope roof more than 48 hours after rainfall under conditions that should allow drying. It matters because it accelerates membrane deterioration, adds substantial dead load to the structure, magnifies ultraviolet damage, and voids many manufacturer warranties. Correcting it usually means adding tapered insulation, adding drains, or both, and that correction belongs in the replacement scope from the start.

How do I verify a commercial roofing contractor is legitimate?

Confirm they hold the license required in your specific city, since neither Colorado nor Wyoming licenses roofers at the state level. Request a certificate of insurance for general liability and workers compensation sent directly by the carrier or agent. Verify manufacturer certification for the exact system going on your building. Confirm a permanent local address and time in business under the current name. Then call three references on comparable small commercial projects completed in the last two years.

What is a Class 4 impact rating and is it worth it?

Class 4 is the highest impact resistance rating under UL 2218, awarded to steep-slope products that withstand a two inch steel ball dropped from twenty feet without cracking. For low-slope products, the comparable standard is FM 4473, which rates hail resistance as MH, SH, or VSH, with VSH being the top tier. In the Colorado and Wyoming hail corridor these ratings frequently pay for themselves through reduced storm damage and, on many policies, insurance premium credits.

How long does a small commercial roof replacement take?

A typical small commercial roof replacement runs from a few days to a few weeks depending on roof size, how many existing layers must be removed, deck repairs discovered during tear-off, the number of rooftop units and penetrations, and weather. Because these buildings are usually occupied during the work, ask for a written schedule that covers daily start and stop times, staging locations, dumpster placement, and parking impact.

How often should I have my commercial roof inspected?

Twice a year, in spring and fall, plus an additional inspection after any significant hail or high-wind event. Regular inspection catches small failures such as a cracked pipe boot or an open seam while they are inexpensive to correct, and documented maintenance is a requirement under most manufacturer warranties.

Working With Excel Roofing

Excel Roofing has served property owners across Colorado and Wyoming since 1993. Our teams work on both low-slope membrane and steep-slope systems, which means we evaluate the whole building rather than the portion that happens to match a specialty. We handle storm damage documentation and insurance coordination, gutter and drainage work, repairs, and full replacement. For owners who also have a home in our service area, our residential team is the same company, with the same warranty behind it.

Every project starts with a straightforward inspection and a written scope that can be compared line by line against another bid. That is the whole idea behind how we do business: You Don't Pay A Cent Until You're Content.

Ready to talk about your building? Schedule a commercial roof inspection with Excel Roofing and get a straight answer about what the roof actually needs, not what is easiest to sell.

We're On Top Of It.

About Excel Roofing: Founded in 1993 by J Bretz, Excel Roofing provides residential and commercial roofing, storm damage restoration, and gutter services throughout Colorado and Wyoming. More than three decades of work in this climate informs every recommendation in this guide.