Warranty and maintenance · Manufacturing plants in Puerto Rico
Roof warranty maintenance for plants: protect the coverage you already paid for
What GAF, Carlisle, Soprema, Sika Sarnafil and other manufacturers require, turned into work orders.
Where coverage is lost
The warranty can be denied exactly when you need it most
Rarely because of the roof. Almost always because of an inspection nobody scheduled, a record nobody kept, a unit nobody approved, or a notice sent a week late. All four are written into the warranty:
- The missed inspection. Carlisle asks for an inspection at least every six months. Soprema, two documented inspections a year. For GAF, inadequate maintenance is the first exclusion.
- The missing record. GAF and Carlisle require records. A Soprema claim asks for a copy of the maintenance log. What was never written down is hard to prove.
- The unapproved unit. At Elevate, an alteration without approval leaves the warranty null and void. GAF, Carlisle, Sika and Johns Manville also require written approval first.
- The late notice. Most allow 30 days. Sika’s sample allows one business day. Johns Manville calls late notice a ground for termination.
Kept current, the same four things are what a manufacturer looks for when it reviews a claim. A roof that stays covered, documented and defensible.
Certified with GAF, Carlisle, Soprema and Sika Sarnafil. Mammoth Services can perform the maintenance and warranty repairs those manufacturers require a certified contractor to do, and services all major commercial roof systems.
What a denied claim looks like
It rarely starts with a bad roof. It starts with a missed step.
This is how ordinary weeks add up to a denial. Every step is common. None felt urgent at the time.
Illustrative scenario. A composite, not a real plant, client or claim.
- FebruaryA capital project installs a new exhaust fan on the roof. The MOC closes without the roof manufacturer’s written approval.
- AprilThe pre-season inspection is pushed back for an audit. The last written report is 20 months old.
- September 12After a tropical wave, water shows up over the warehouse. Maintenance opens a CMMS order, calls the contractor and assumes that counts as notice.
- October 20Written notice finally goes to the manufacturer. It is day 38.
- NovemberThe investigation traces the leak to the fan curb. The response cites an unapproved addition, no recent records and late notice. Coverage is denied.
- The meetingThe plant director has to explain to site leadership and corporate why a warranty they paid for will not pay, and why the repair and the next leak come out of the plant’s budget.
What would have changed the outcome
- The manufacturer’s approval as a required MOC step.
- The April inspection, with a dated report.
- The plant’s own written notice to the manufacturer, the same week in September.
- One record that shows all three.
None of it is expensive. All of it has to happen on time.
Six manufacturers, side by side
Different logos. The same owner duties.
GAF, Carlisle, Soprema, Sika Sarnafil, Johns Manville and Elevate word their warranties differently. The core duties barely change: written notice by a deadline, regular inspections, records, approved repairs, written approval before rooftop changes, and transfer rules.
| Manufacturer | Leak notice | Inspections and records | Repairs and rooftop changes | Transfer |
|---|---|---|---|---|
| GAFDiamond Pledge COMTS700-1224 and other 2024 forms | Notice to GAF “directly about the leak, in writing, within 30 days.” Notice to the roofer does not count. | “You must perform regular inspections and maintenance and keep records of this work.” Twice a year is optimal, per GAF’s booklet. | Repairs GAF identifies “must be performed by a GAF-certified roofing contractor.” Changes need “prior written approval” from GAF. | Written request within 60 days of the sale. A fee applies. |
| CarlisleGolden Seal, F0001 Rev 12/24 | Written notice “within thirty (30) days of any leak.” | “Inspect the roof at least every six months (preferably spring and fall).” “Owner must retain records related to the Roofing System.” | Void if repairs, alterations or “solar arrays” go on “without first obtaining written authorization from Carlisle.” | Transferable after Carlisle’s procedures, including an inspection. A fee applies. |
| SopremaPlatinum Form 101 and Standard Form 100, 2025 samples | “Warranty claims must be submitted within 30 days after a leak or other related issue is discovered.” “Time is of the essence.” | Owners must see that “at least two documented Care and Maintenance inspections are conducted and recorded each year.” A claim needs “A copy of your Care and Maintenance log.” | “Any future work impacting the roofing must be performed by a contractor authorized to install and service SOPREMA roofing.” | Written request “no later than 6 months after ownership changes,” plus any needed repairs. A fee applies. |
| Sika SarnafilSika membrane warranty template, sample 9-8-21 | Notice “on the first business day immediately following the discovery of each leak,” confirmed “in writing within one week.” | Owners must use “reasonable care in maintaining the roof as described in the Owner’s Guide.” Sika Sarnafil “suggests scheduling at least two inspections a year.” Records: not stated in the public sample. | Void if repairs or “photovoltaic (PV) systems, fixtures, equipment, or structures” go on without Sika’s written authorization. | Only “if approved in advance and in writing by Sika Corporation.” |
| Johns ManvillePeak Advantage Guarantee, sample | Notice “in no event later than thirty (30) days after initial discovery of the leak, time being of the essence.” | “Inspect your Roofing System at least semi-annually.” “Maintain a file for your records.” | Changes, including “solar overlays,” must be “pre-approved in writing by JM.” Repairs JM calls for must be made promptly. | At JM’s “sole and absolute discretion.” Fee due within 30 days of the sale. |
| ElevateRed Shield, 1001.001.2026 | Notice “in writing or by telephone” within 30 days of the leak. | Owners must use “reasonable care in maintaining the System,” per the Elevate Maintenance Guide. Frequency and records: not stated in the warranty itself. | Alterations, including PV arrays, need Amrize’s approval. Non-covered leaks must be repaired by a licensed Elevate applicator within 60 days. | Transferable on payment of the current transfer fee. |
“Failure to obtain Amrize’s approval for a roof alteration, or failure to provide required documentation, shall render this Limited Warranty null and void.”
“As the Owner, you are responsible for ensuring that at least two documented Care and Maintenance inspections are conducted and recorded each year.”
Why the contractor matters
Manufacturers require warranty repairs and maintenance work on the roof to be done by a contractor they have certified. Soprema says it directly: future work “must be performed by a contractor authorized to install and service SOPREMA roofing.” GAF requires a GAF-certified roofing contractor for the repairs it identifies.
Mammoth Services is certified with GAF, Carlisle, Soprema and Sika Sarnafil, so we can do that work on those systems. On any other system, we will tell you plainly what your warranty requires.
Read your own document
Three honest differences. Sika’s public sample is a five-year membrane warranty with the shortest clock here; its system warranties were not public, so check yours. Soprema’s guide says a maintenance lapse “will not void the warranty, but could affect any future warranty claims.” And the Johns Manville sample shows no edition date.
Sources: GAF COMTS700-1224; GAF COMGN119-PDF-0924; Carlisle F0001 Rev 12/24; Soprema Form 101 and Form 100, with Forms 900 and 901; Sika template 9-8-21; Sika Sarnafil maintenance page; Johns Manville Peak Advantage sample; Elevate 1001.001.2026. Specimens change. The document issued for your roof controls.
Courts and FM Global
Warranty conditions are read as written
Not a sales argument. What the documents say, what the insurer behind many plants asks for, and what happened when they were tested.
A plant: Weyerhaeuser v. TAMKO
The partnership that owned a paper plant dissolved and the plant became a division of its parent. A federal court treated it as a change of ownership and held the 10-year NDL roof guarantee void (N.D. Iowa, 2003).
Notice: Gold Peak v. GAF
A Colorado association knew of a problem in 2018 and notified GAF in 2020. The warranty required notice in 30 days. The Tenth Circuit affirmed summary judgment for GAF in 2024 (residential, unpublished).
“Inspections are recommended semi-annually and before and after storms with high winds or heavy rain […]”
“Maintain written or computer-based records with pictures of problem areas. Consider using an Engineered Management System (EMS) for large facilities with many different roofs.”
Many manufacturing plants in Puerto Rico are insured by FM Global. Its roof engineering standard and the manufacturers’ warranties point the same way, so one program can satisfy both.
Sources: Weyerhaeuser Corp. v. TAMKO Roofing Products, 298 F. Supp. 2d 836; Gold Peak HOA v. GAF Materials, No. 23-1181 (10th Cir. 2024); FM Global DS 1-32. General information, not legal advice.
The roof is an asset
Put the roof in your PM program, like an air handler or a boiler
In many plants, pumps and air handlers have frequencies, work orders and evidence in the CMMS, and the roof does not. Yet the warranty asks for exactly what good PM already produces.
| PM element | What manufacturers require | What FM Global recommends | How it lives in your CMMS |
|---|---|---|---|
| Frequency | Twice a year at Carlisle, Soprema and Johns Manville; GAF calls it optimal. Plus after severe weather. | Semiannual inspections, and before and after storms with high winds or heavy rain. | Two recurring PMs a year per roof section, plus an order per event. |
| Records | Inspection and maintenance records (GAF, Carlisle, Johns Manville); a log to file a claim (Soprema). | Written or computer-based records with pictures of problem areas. | Findings with photo and location inside the order, closed with evidence. |
| Repairs | By a contractor the manufacturer has certified or authorized. | Correct deficiencies following the manufacturer’s guidelines. | Corrective orders linked to the finding, with the contractor recorded. |
| Access | A roof access log (GAF) or rooftop traffic log (Carlisle). | Secure roof access points and limit access to authorized personnel. | A roof access permit and log, like any controlled space. |
| Changes | Written approval before changes or equipment (GAF, Carlisle, Sika, Johns Manville, Elevate). | Consult the manufacturer before repairs or testing that open the roof. | A required step in management of change (MOC) for any rooftop project. |
Sources: GAF COMTS700-1224; Carlisle F0001; Soprema Form 901; GAF COMGN119-PDF-0924; FM Global DS 1-32, 2.2.1.2, 2.2.1.3, 2.1.4. Roof access and hot work in regulated plants are covered on our pharma plant roofing page.
Worked example: GAF
One manufacturer, read line by line
We use GAF as the example because its 2024 forms are public and current, and because Mammoth is a 2026 GAF GoldElite Commercial Contractor (GAF ID 1133335). The same pattern carries to the other manufacturers. We quote the Diamond Pledge.
“In the event of a leak through the GAF Roofing Materials, you MUST make sure that GAF is notified directly about the leak, in writing, within 30 days […] NOTE: The roofing contractor is NOT an agent of GAF; notice to the roofing contractor is NOT notice to GAF.”
“You must perform regular inspections and maintenance and keep records of this work.”
“To keep this guarantee in effect, you must repair any conditions in the building structure or roofing system that are not covered by this guarantee but that GAF concludes may be threatening the integrity of the GAF Roofing Materials. Any such repairs must be performed by a GAF-certified roofing contractor.”
Which GAF guarantee your roof has
| Document | Workmanship covered | Repair limit | Transfer |
|---|---|---|---|
| Integrated System Limited Warranty (COMTS703-1224) | No. Its first exclusion is improper workmanship. | Capped, as stated in the document. | In writing within 60 days; a fee applies. |
| System Pledge (COMTS704-1224 single-ply, COMTS586-1224 asphaltic) | Yes. | Capped, as stated in the guarantee. | In writing within 60 days, after any repairs GAF identifies; a fee applies. |
| Diamond Pledge NDL (COMTS700-1224) | Yes. | No dollar limit (NDL). | In writing within 60 days, after any repairs GAF identifies; a fee applies. |
Workmanship: the difference that matters most
Only two of the three cover the installation. The System Pledge and Diamond Pledge cover leaks from workmanship in applying the materials. The Integrated System Limited Warranty excludes “Improper workmanship in applying the GAF Roofing Materials or any other roof component.” There, an installation leak goes back to the installer.
Sources: COMTS700-1224; COMTS704-1224; COMTS586-1224; COMTS703-1224; GAF comparison guide. Quotes are exact; […] marks text we left out. Verify Mammoth on GAF.com.
What voids or suspends coverage
Seven GAF exclusions, as they show up in a plant
An exclusion means the manufacturer will not pay for that damage. If the damage affects the roof’s integrity, GAF can suspend or cancel the whole guarantee. Other manufacturers list close equivalents.
| Exclusion | What GAF says | What it looks like in a plant | The PM task |
|---|---|---|---|
| 1 · Maintenance | “Inadequate roof maintenance,” including the failure to repair owner responsibility items. | A finding from an inspection two years ago, still open in the CMMS. | Every finding gets a corrective order and a close date. |
| 4(d) · Chemicals, grease and oil | “chemical attack on the membrane, including, but not limited to, exposure to grease or oil” | Process, kitchen or equipment room exhaust discharging onto the membrane. | Check discharges every visit, clean spills and repair affected membrane. |
| 4(c) and 4(f) · Moisture from inside | “condensation” and “moisture migration from the building interior” | Washdown areas, autoclaves, cold rooms and wet processes under the roof. | Tell a leak from condensation before claiming; document it with engineering. |
| 5 · Traffic | “Traffic of any nature on the roof unless using GAF walkways” | HVAC techs and contractors crossing the roof to the air handlers. | Walkways where people really walk, an access permit and log. |
| 7 · Changes without approval | “installation of any overburden, modifications, or additions […] unless prior written approval is obtained from GAF” | A new scrubber, an exhaust fan, process piping, an antenna or solar panels. | Manufacturer’s written approval before the work, inside your MOC process. |
| 8 · Sustained heat | “Exposure to sustained high-temperature conditions” (EverGuard Extreme TPO: above 195°F) | Hot discharge from boilers, ovens or other process equipment. | Map the hot zones and check them every inspection. |
| Ponding (asphaltic roofs) | Asphaltic System Pledge, Exclusion 8: “Conditions that prevent positive drainage or result from ponding water.” | Standing water near drains clogged by leaves, sediment or vegetation. | Drains and scuppers cleared every visit; recurring ponding documented. |
“This guarantee MAY BE SUSPENDED OR CANCELLED IF THE ROOF IS DAMAGED BY any cause listed above as AN EXCLUSION FROM COVERAGE that may affect the integrity or watertightness of the roof.”
Sources: COMTS700-1224, Exclusions 1, 4, 5, 7 and 8; COMTS586-1224, Exclusion 8. Numbering follows the Diamond Pledge; other GAF forms number differently.
Hurricanes
Hurricanes are excluded. That is why maintenance and evidence matter more.
In the GAF example, the standard guarantee does not pay for hurricane damage. What a good program does is reach the season with the roof in order, and come out of every storm with photos, dates and notices that separate storm damage from wear.
“Unusual weather conditions or natural disasters including, but not limited to, winds in excess of 55 miles per hour, hail, floods, hurricanes, lightning, tornados, and earthquakes, unless specifically covered by an addendum to this guarantee.”
The System Pledge uses the same wording. The Integrated System Limited Warranty lists winds over 55 miles per hour and hurricanes as exclusions, with no mention of an addendum. If your roof has a wind addendum, that document sets the limit; file it with the guarantee.
Before and after every storm
- A pre-season inspection in April or May, with repairs closed before June 1.
- Loose objects off the roof; equipment panels closed; drains clear.
- After the storm, safety first: nobody goes up until it is safe.
- Reasonable temporary repairs to protect the building and the product; the guarantee allows them.
- Dated photos of the roof and the interior, useful to both the insurer and the manufacturer.
- If there is a leak, the owner notifies the manufacturer in writing within its deadline. The clock does not stop for the hurricane.
Sources: COMTS700-1224, Exclusion 2 and Owner Responsibilities; COMTS703-1224; FM Global DS 1-32, 2.2.1.8; NOAA National Hurricane Center. Design winds and the building code are on our pharma plant page.
Salt air and humidity
On an island, metal and sealants age first
Salt air corrodes flashings, copings and fasteners, and constant sun and humidity age and crack sealants. GAF’s maintenance checklist has a full task for metal, and FM Global puts it on its list of deficiencies.
“Examine all metal flashings, counterflashings, expansion joints, and pitch pockets for rust, detachment or damage, and deteriorated sealant. Reattach loose metalwork, replace sealant as necessary; repair metal as necessary; and prepare and paint any rusted metal.”
FM Global asks owners to correct flashing with “holes or corrosion; and cracked or weathered sealants,” plus vegetation and debris blocking drains, scuppers and gutters (DS 1-32, 2.2.1.10). In Puerto Rico that includes leaves, seeds and even plants growing in the sediment of a slow drain.
For PM: metal checked, sealants replaced and drains cleared every visit, with before and after photos.
Sources: GAF COMGN119-PDF-0924; FM Global DS 1-32, 2.2.1.10.
Yearly calendar
A year of roof PM, aligned with the season and your shutdowns
Two fixed inspections that open and close hurricane season, event inspections, and the larger repairs inside the shutdown windows your plant already plans.
| When | Work order | What gets done | Evidence left behind |
|---|---|---|---|
| April to May | Semiannual PM 1, pre-season | Full manufacturer checklist; edges, metal and equipment anchorage; drains; repairs closed before June 1. | Report with photos per finding; corrective orders closed. |
| June 1 to November 30 | Hurricane season (NOAA) | Inspection after every storm with high winds or heavy rain; temporary repairs where needed. | Dated photos. If there is a leak, the owner notifies the manufacturer in writing. |
| October to December | Semiannual PM 2, post-season | Full checklist; corrosion and sealants; what the season left behind; next year’s capital plan. | Report with photos; open items prioritized. |
| Your plant’s shutdown windows | Planned correctives | Repairs that need air handlers off or areas isolated, coordinated with production and QA. | Closed order with photos and installed materials. |
| Before and after any project | Management of change | Manufacturer’s written approval before, obtained by the owner; roof inspection after. | Approval on file; access log; final inspection. |
| Every visit | PM route | Drains, gutters and scuppers clear; debris off; exhaust checked. | Signed checklist. |
The months are Mammoth’s suggestion for Puerto Rico, not a manufacturer requirement. The semiannual frequency comes from the warranties and FM Global DS 1-32; season dates come from the National Hurricane Center.
Free download
Bilingual roof PM work order template
Three pages in Spanish and English: asset and guarantee, an area checklist (including salt air, process exhaust and interior moisture), leaks with the date of notice to the manufacturer, changes with their written approval, and closeout. With a CSV of the same fields to import into your CMMS.
Solar · GAF-specific
Solar on a GAF EverGuard roof: the rule is in writing
With the grid as it is, many plants look to the roof for power. In 2025, Puerto Rico customers averaged 36 hours of interruptions not counting major events, according to the EIA. By the end of 2025 there were 5,341 commercial and 87 industrial distributed generation systems interconnected.
“Systems and any alterations must be installed by GAF GoldElite™ Commercial Contractors and GAF PlatinumElite™ Commercial Contractors in order to be eligible for coverage under GAF system guarantees.”
The same GAF guide sets the rest of the path for EverGuard single-ply roofs:
- All photovoltaic documents “must be reviewed and approved by GAF prior to the installation.”
- GAF inspections before and after the installation; a fee applies.
- “NOTE: GAF guarantees do NOT cover the PV system.” The guarantee covers the roof, not the panels.
- Check that the roof’s remaining guaranteeable life covers the PV system’s expected life (typically more than 20 years).
Where Mammoth comes in
Mammoth Services is a GAF GoldElite Commercial Contractor, so we can do that work. We are not solar installers: we do the roofing side, alongside your installer. We install the mounts, flashings and alterations to GAF’s rules. GAF’s written approval is the owner’s to obtain, before installation.
One caveat from the same guide: on roofs under 2 years old, that work should be done by the original installing contractor.
If your roof is from another manufacturer, its written approval rule applies; see the table above. Carlisle, Sika, Johns Manville and Elevate name solar specifically.
Sources: GAF COMEG439-PDF-0325, June 2025 (served at GAF’s C-01 URL); COMTS700-1224, Exclusion 7; EIA, Today in Energy, Aug 10, 2026; LUMA to PREB, Q4 2025; Carlisle F0001 Rev 12/24.
Sales, acquisitions and restructurings
When the owner changes, the warranty does not follow on its own
Plants in Puerto Rico change hands and corporate structure often. Each manufacturer has its own transfer window, and it is short.
- GAF: a written request within 60 days of the transfer, plus any repairs GAF identifies (Diamond Pledge and System Pledge). A fee applies. Otherwise: “This guarantee is NOT otherwise transferable or assignable by contract or operation of law, either directly or indirectly.”
- Soprema: a written request no later than 6 months after ownership changes, with a fee and any needed repairs.
- Johns Manville: at JM’s discretion, with the fee due within 30 days of the transfer.
- Carlisle, Sika and Elevate: their own procedures. Carlisle requires an inspection and a fee, Sika its advance written approval, and Elevate the current transfer fee.
What counts as a change of owner can be broader than a sale. In Weyerhaeuser, the dissolution of the owning partnership was enough to void a guarantee that had no transfer path.
On the due diligence list
- Each warranty, with manufacturer, number and remaining term.
- Inspection and repair records, and any items the manufacturer has flagged.
- Written approvals for added equipment, curbs and solar.
- The transfer request, dated inside the window, with the fee budgeted.
- If the legal entity changes, even if the plant stays the same, ask your counsel.
Sources: COMTS700-1224, Transferability; Soprema Form 101, item 16; Johns Manville sample; Carlisle F0001, item 11; Sika 9-8-21, item 8; Elevate 1001.001.2026; Weyerhaeuser v. TAMKO, 298 F. Supp. 2d 836. General information, not legal advice.
The maintenance program
The duty is yours. The work can be ours.
Every warranty on this page puts maintenance on the owner. Mammoth Services is certified with GAF, Carlisle, Soprema and Sika Sarnafil, and services all major commercial roof systems. Our maintenance program covers three things: the scheduled inspections, the maintenance work and the records the manufacturers require. Our technology partner, Roof React, keeps the roof’s record.
Scheduled inspections
Before and after hurricane season, to your manufacturer’s checklist. Every finding with a photo and location.
Event inspections
After high winds, heavy rain and storms, as the warranties ask, and after other trades have worked on the roof.
Maintenance work
Drains, seams, flashings, sealant, metal and walkways, by our own bilingual crews.
Inside your site’s rules
Access, hot work and lift permits, and coordination with EHS, QA and engineering.
The records they ask for
Dated reports, photos, invoices and the access log, in orders that fit your CMMS.
A record that travels
One file, ready for a claim, an insurance renewal, an audit or a sale.
What stays with the owner
Two duties stay with you, and no contractor can take them over. Leak notice goes directly to the manufacturer, in writing and inside its deadline. And the manufacturer’s written approval comes before anything new goes on the roof. Our records show the roof’s condition and what has changed on it.
Leak repair is a separate Mammoth service.
The record behind the program: Roof Passport and Roof Index
Mammoth partners with Roof React to keep each roof’s record. Roof React is a separate company that runs a commercial roof readiness and response platform; it is not a roofing contractor. Its Roof Passport is, in Roof React’s words, “one living record for every roof you manage,” covering systems, conditions, warranties and response.
Roof React calls the organized record the Roof Index: “A registered roof becomes a known asset.” It is arranged in six areas, and one is built for exactly the subject of this page:
- Roof identificationWhich roof section is affected, and what critical operations are protected below it.
- System & assemblyWhat is installed, how it is attached, and which repair methods are compatible.
- Condition & open itemsWhat has failed before, what remains unresolved, and what requires action now.
- Warranty & documentsWhat is covered, what could void coverage, and how an approved repair proceeds.
- Wind & drainageHow field, perimeter and corner zones resist uplift, and how primary and overflow drainage moves water.
- Access & responseHow responders enter, work safely, reach decision-makers, and stabilize the site.
Mammoth does the maintenance; the Roof Passport holds the record.
Roof management Learn more about Roof React
Roof React descriptions and quotes are from roofreact.com, accessed October 7, 2026.
What we can show you today
Mammoth Services is a commercial roofing firm with operations in Puerto Rico, led by its owners, Trisha Lira and Mark Lira.
- Prequalification
- ISNetworld member
- Manufacturer certifications
- Certified with GAF, Carlisle, Soprema and Sika Sarnafil. On GAF: 2026 GAF GoldElite Commercial Contractor (GAF ID 1133335)
- GAF warranties on qualified projects
- Diamond Pledge NDL, System Pledge, Integrated System Limited Warranty
- Experience
- 42 years of combined team experience
- EMR
- EMR 1.0, within the typical pharma threshold of 1.0 or below.
- TRIR / DART
- TRIR 0.0 and DART 0.0 in 2025 and 2026 to date (zero recordable injuries).
- Written programs
- Written fall protection, hot work and crane lift plans, with a designated competent person. Available to clients on request.
- Hot work and torches
- Torch-applied and heat-welded systems installed under the plant’s hot work permit, with fire watch and post-work monitoring. Method chosen with the site’s EHS team for each area.
- Puerto Rico registration
- Registered to do business in Puerto Rico, with CFSE workers’ compensation coverage.
- Pharma experience
- Recurring roofing work in Puerto Rico under a master service agreement with a global pharmaceutical manufacturer, renewed in September 2026 for three more years.
- FM Global
- Experience installing FM Approved roof systems at pharmaceutical manufacturing sites.
- Crews in Puerto Rico
- In-house, bilingual crews in Puerto Rico (Spanish and English).
- GMP training
- Crews have completed client GMP and site orientation training at pharmaceutical and medical device facilities.
FAQ
Frequently asked questions
What do commercial roof warranties require to stay valid?
The major manufacturers ask for the same core things: written notice of any leak within their deadline (30 days for GAF, Carlisle, Soprema, Johns Manville and Elevate; the next business day in Sika’s sample), regular inspections, usually twice a year, with records, repairs by a contractor the manufacturer has certified, written approval before rooftop changes or new equipment, and the transfer rules when the owner changes.
Does telling our roofing contractor count as notice to the manufacturer?
Not under GAF’s forms, which say it in capital letters: the contractor is not an agent of GAF, and notice to the contractor is not notice to GAF. The other warranties reviewed here also direct notice to the manufacturer. A CMMS work order does not count either. That step is the owner’s: notify the manufacturer directly, in writing, and keep the confirmation.
Can our own maintenance staff do the inspections?
Most warranties require inspections and records but do not say who inspects. Repairs are different: GAF requires a GAF-certified contractor for what it identifies, and Soprema requires any future work on the roof to be done by a contractor it has authorized. Many plants pair staff rounds with a certified contractor for the semiannual inspections and repairs.
What happens to the warranty if we sell the plant or the corporate structure changes?
Each manufacturer has its own rule, and the windows are short. GAF requires a written request within 60 days of the transfer. Soprema allows up to 6 months. Johns Manville requires its fee within 30 days and transfers at its discretion. Carlisle, Sika and Elevate set their own procedures and fees. In the Weyerhaeuser case, a corporate restructuring counted as a change of ownership. Put the warranty on the due diligence list.
Do solar panels void the roof warranty?
They can if they go on without the manufacturer’s written approval. GAF, Carlisle, Sika, Johns Manville and Elevate all name additions or solar in their terms. On GAF EverGuard single-ply roofs, GAF’s June 2025 guide adds document approval before installation, GAF inspections before and after, and installation by GAF’s top certified contractors, including GoldElite. GAF guarantees do not cover the PV system.
How often should a plant roof in Puerto Rico be inspected?
Twice a year: what Carlisle, Soprema and Johns Manville call for, what GAF calls optimal and what FM Global recommends, plus an inspection after every storm with high winds or heavy rain. In Puerto Rico we suggest April or May, before hurricane season, and October to December, as it ends.
Is Mammoth certified with my roof’s manufacturer?
Mammoth Services is certified with GAF, Carlisle, Soprema and Sika Sarnafil, so we can perform the maintenance and warranty repairs those manufacturers require a certified contractor to do. On GAF we are a 2026 GoldElite Commercial Contractor, GAF ID 1133335. We service all major commercial roof systems.
Next step
Protect the warranty your plant already owns.
We can take on the inspections, the maintenance work and the records your warranty asks for. Book a roof assessment: we read your warranty with you, walk the roof against its maintenance conditions, and tell you plainly what is current and what is open. No pressure, no obligation.
Sources
All sources were checked on October 7, 2026. Quotes come from the public forms and samples named. This page is informational: it does not replace the text of your warranty or the advice of your engineer, your insurer or your counsel.
- GAF, EverGuard Diamond Pledge NDL Roof Guarantee, COMTS700-1224 (©2024)
- GAF, EverGuard System Pledge Roof Guarantee, COMTS704-1224 (©2024)
- GAF, RUBEROID/GAFGLAS System Pledge Roof Guarantee, COMTS586-1224 (©2024)
- GAF, Integrated System Limited Warranty, COMTS703-1224 (©2024)
- GAF, Photovoltaic Installations on GAF EverGuard Single-ply Guaranteed Roofing Systems, COMEG439-PDF-0325 (June 2025)
- GAF, Commercial Scheduled Maintenance Checklist booklet, COMGN119-PDF-0924 (©2024)
- GAF, Commercial Roof Warranty and Guarantee Comparison Guide (accessed Oct 7, 2026)
- GAF, Choosing the Right Commercial Roofer (accessed Oct 7, 2026)
- GAF, Mammoth Roofing Services, GAF ID 1133335 (accessed Oct 7, 2026)
- Carlisle SynTec, Golden Seal Total Roofing System Warranty, F0001 (REV 2024, Rev 12/24)
- SOPREMA, Platinum Roofing System Warranty, Form 101, sample, with Forms 900 and 901 (2025-05 file; Forms 900 and 901 dated 08/2026)
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