What We Do
ASPHALT SHINGLE
Installing Asphalt Shingles
This is probably the simplest roofing material to install. They are appealing and are fairly priced hence the high preference. When compared to other roofing materials, asphalts are easier to install. This can become an easy DIY project that homeowners can undertake to save costs. First, you have to determine the number of shingles you need for the new installation project. Next, know how to install a roof flashing, roof underlayment, and finally, the asphalt shingles.
To install this type of roofing:
Calculate the number of shingles you will need for the project to be complete. Basically, you have to measure the roof size and divide it by the size of each shingle.
Install the flashing on the roof. Each of the roof valleys require a flashing installed. First, roll out flashing in each of the sections and lock it in place using roofing nails. When installing shingles around the flashing, you may have to utilize roofing cement to seal openings. Flashing is also needed at the roof section that goes up against the wall of the house for multi-tiered roofs.
Install a roof underlayment. Once the flashing has been installed, you need to prepare the surface for shingles. A drip edge, ice barrier, and underlayment must be installed to achieve this. These will be fixed in place using staples or nails. Start with the drip edge and ice /water barrier first before installing the underlayment. This process may require the input of professionals since a slight mistake can cause serious damage.
Install the roof shingles. Once the underlayment has been fixed properly, then you can now fix the shingles flowing downwards. Shingles should be laid in a row starting from the roof’s edge. Make sure the rows go down, overlapping the starter shingles laid at the bottom.
Asphalt shingle installation may seem like an easy thing to do on your own until you have to master the steps involved. However, it can be cumbersome and even confusing if you have no professional experience to handle it. Therefore, rather than make costly mistakes with your roofing materials, it is advisable to hire the services of competent roofing experts to help you with the process.
FLAT ROOF
FLAT & STEEP SLOPE SYSTEMS
Roof damage often goes unnoticed until it becomes a leak. In Clackamas County, OR climate — where rain falls nearly 150 days a year — even minor seam failures or blocked drains can escalate into water-damaged insulation, mold, and ceiling collapses that shut down operations. The earlier you catch a problem, the cheaper it is to fix.
Protect Your Building Before Problems Escalate
We help Clackamas County, OR area property owners and managers identify issues early through inspections, repairs, and preventative maintenance designed to extend roof life and reduce risk. A typical Residential roof inspection with GMZ & Sons Roofing LLC, takes 1–2 hours and results in a written condition report with photos, prioritized recommendations, and honest guidance on whether repair or replacement makes the most sense for your budget.
Residential Roofing Services
Roof inspections and condition assessments
Leak detection and targeted repairs
Preventative maintenance programs
Residential roof replacement and reroofing
Systems We Work With
GMZ & Sons Roofing LLC, installs and services both low-slope and steep-slope Residential roofing systems throughout the Portland metro area and Southwest Washington. TPO and PVC membranes are the most popular choice for flat Residential roofs in the Pacific Northwest — both handle Portland’s persistent rainfall well, with PVC offering superior resistance to ponding water and TPO providing excellent energy efficiency. For steep-slope Residential buildings, we work with metal roofing systems, asphalt shingles, and flat and low-slope assemblies depending on pitch, budget, and building use.
TPO and PVC roofing
Metal roofing systems
Asphalt shingle roofing
Flat and low-slope assemblies
Thermoplastic Roofing Systems (TPO & PVC)
Thermoplastic roofing systems are flexible membranes designed to expand and contract with temperature changes — a critical feature in the Pacific Northwest where roofs cycle through cold wet winters and warm dry summers. TPO and PVC are the two most widely installed commercial roofing membranes in Clackamas County, OR, and for good reason. Both handle Oregon’s heavy rainfall and freeze-thaw cycles exceptionally well, typically lasting 20–30 years when properly installed and maintained.
Built for Performance
TPO and PVC roofing systems are the go-to choose for low-slope Residential roofs across the Portland metro area due to their:
Durability and long lifespan (20–30 years)
Strong, heat-welded seams that won't peel or separate in wet conditions
Proven performance in high-rainfall Pacific Northwest climates
Resistance to moisture, mold, and weather exposure
Reflective white surface that reduces cooling costs during Portland summers
The key difference: TPO is generally more cost-effective, running $7–$12 per square foot installed. PVC costs slightly more at $9–$14 per square foot but offers superior resistance to ponding water and chemical exposure — making it the better choice for restaurant rooftops or Portland buildings where water doesn’t drain quickly.
Ideal for Low-Slope Residential Roofs
TPO and PVC systems are widely used for Residential offices, retail buildings, warehouses, and multifamily properties throughout Portland, Beaverton, Lake Oswego, Vancouver, and surrounding communities. GMZ & Sons Roofing LLC, installs both systems and will recommend the right membrane based on your roof slope, drainage, budget, and building use — not whatever has the highest margin.
ROOF REPAIR
Signs Your Roof Needs to be Repaired
Leaky roof icon
Leaks or Water Stains
The presence of unexplained water stains on your Pacific Northwest home’s ceilings or walls signals potential roof issues, demanding immediate attention.
Sagging or Uneven Roof Surface
A visibly uneven or sagging roof surface in the Portland-Vancouver area could be indicative of structural concerns. Prevent further damage by acting now.
Excessive Granule Loss
Discovering an excess of granules in your gutters or near downspouts is a red flag for aging shingles, signaling the potential need for a comprehensive roof repair or replacement.
Curling or Buckling Shingles
In the Pacific Northwest, the presence of curling or buckling shingles signals the end of their effective lifespan. Prioritize addressing the issue and prevent water penetration.
Interior Mold or Mildew Growth
The presence of mold or mildew within your home may indicate a roof leak or poor attic ventilation, which can be identified through a comprehensive roof inspection where an expert can create a plan of action to fix the cause.
Visible Roof Rot or Decay
Detecting visible signs of rot or decay on your roof structure demands immediate action to prevent further deterioration and maintain the integrity of your home.
Increased Energy Bills
An abrupt increase in energy costs might be associated with inadequate roof insulation or ventilation, highlighting the need for a roof evaluation and possible repairs to enhance energy efficiency.
Loose or Damaged Flashing
Damaged or loose flashing around chimneys, vents, or other roof penetrations poses a risk of leaks, necessitating swift repair to protect your home from water damage.
Old Age
If your roof is approaching or surpassing its expected lifespan, our professional roof inspections are crucial for assessing its condition and planning next steps, especially in the dynamic climate of the Pacific Northwest.
What to Do If Your Roof is Leaking
If you’re experiencing a roof leak, here’s what you should do:
Identify the Source of the Leak
Act promptly by pinpointing the precise source of your roof leak. A swift and accurate identification sets the stage for efficient resolution.
Contain the Water
Place pots or buckets beneath the leak to catch the water. This proactive measure minimizes potential damage to your home’s interior.
Protect Your Belongings
Prioritize the protection of your belongings by safely covering or relocating them away from the affected area. Be mindful of electrical safety to ensure a hazard-free environment.
Document the Damage
Document the situation with clarity through photographic evidence. Photographs of the damage serve as a valuable asset for insurance claims and aid our professional assessments.
Call an Emergency Roofing Contractor
Reach out to our emergency roof repair team. We excel in rapid inspections, accurate diagnoses, and effective repairs tailored to your unique situation.
Apply a Temporary Patch (If safe)
In certain instances, apply a temporary patch if it’s safe and feasible. This interim solution helps minimize water entry until our roofing professionals arrive.
Our team is "ON-CALL'' 24/7, 365 days a year
Trust our roof repair experts in Oregon for prompt roof leak repair services.
because we know leaks can occur at any time, day or night.
Delaying action can lead to more problems, including mold issues and the need for significant repairs. Count on us for swift and efficient service to address your roof concerns without delay!
(503) 422-9252
gmzsonsroofing@gmail.com
ROOF INSPECTION
Maintaining Your Roof with Regular Inspections
In Oregon, it’s not uncommon to see rain, wind storms, winter weather, and other occurrences that wear on your roof. If you don’t get inspections to ensure your roof is still in good condition, you put yourself and anyone else living in your home or Residential building at risk the next time inclement weather rolls through town.
At GMZ & Sons Roofing LLC, we offer roof inspections as well as free estimates for services like roof repairs and replacements, which involve an initial inspection of your roof to confirm the extent of the damage. We can also provide you with an inspection report for an additional fee, so you have a clear record of the current state of your roof.
It is always better to know exactly what is going on with your property, so you don’t wind up with a nasty surprise month down the road. A roof inspection should be part of your standard due diligence as a homeowner and will help you maintain your roof for years to come.
The Importance of Getting Your Roof Inspected
There are a few reasons why we recommend getting a roof inspection regularly:
You will catch problems before they escalate. This means you will reduce damage from leaks and structural roof problems. It will also reduce the amount you have to pay for repairs, as you’ll likely notice an issue early enough to fix it with a simpler solution.
Your roof will last longer. Inspections can help you understand how to better care for and maintain your roof. And, by repairing problems as they crop up, you are less likely to encounter something so severe that it results in an early replacement of your roof.
You ensure you are safe. Certain issues, like poor attic ventilation or insulation, can result in severe damage to the structure of your roof. This is just one of the elements we will check when providing a roof inspection.
It’s a protection against future storms. You never know when a major storm is going to hit town next. You may not know that there is a problem with your roof until it does and a leak or other vulnerability becomes obvious. It is better to avoid this upfront.
The Benefits of a Roof Inspection from GMZ & Sons Roofing LLC
When you’re in the market for a roofing inspection, consider GMZ & Sons Roofing LLC, we have been in business since 2006, making us a longstanding member of the local community. During this time, we have cemented our reputation as a reliable source of roofing expertise. We will not only inspect your roof — we will also repair any problems we find and make recommendations for future care of your roof. If necessary, we can also replace a roof that has issues that are too significant to simply repair.
You will work with roofing professionals who are not only knowledgeable, but friendly too. We understand how stressful it can be to suspect something is going wrong with your roof, so we do everything we can to lighten the load on you and your family. Contact us today to set up your inspection or free estimate!
STORM DAMAGE REPAIR:
Protect Your Home with Swift Storm Damage Repair
When storms strike Portland and the surrounding areas, your roof is your first line of defense. GMZ & Sons Roofing LLC, offers comprehensive storm damage repair services to restore your home’s protection quickly and effectively. Our skilled team is ready to assess and address any damage caused by severe weather conditions. We provide:
Emergency roof repairs
Comprehensive damage assessment
Water damage mitigation
Structural repairs
Shingle replacement
Gutter system repairs
Debris removal
Don’t let storm damage compromise your home’s integrity. Reach out to us for prompt and professional storm damage repair services.
Immediate Action for Long-Term Protection
Storm damage can escalate quickly, leading to more severe issues if not addressed promptly. Here’s why immediate storm damage repair is crucial:
Prevents water infiltration and further structural damage
Mitigates the risk of mold and mildew growth
Ensures the safety of your family and belongings
Maintains your home's value and curb appeal
Reduces the likelihood of costly future repairs
Reduces the likelihood of costly future repairs
Our team at GMZ & Sons Roofing LLC, understands the urgency of storm damage repair. We’re equipped to handle emergencies and provide swift, effective solutions to protect your home from further harm.
Why Choose GMZ & Sons Roofing LLC
When it comes to storm damage repair, GMZ & Sons Roofing LLC, stands out as the premier choice in Portland and surrounding areas. Here’s why homeowners trust us:
15-year craftsmanship warranties for peace of mind
Free estimates typically within 24-48 hours
Complimentary roof inspections
Fully licensed and insured for your protection
Locally owned and operated since 2018
Over 20 years of industry experience
Preventative maintenance plans to avoid future issues
Same-day service available for emergencies
Meticulous clean-up after every job
Flexible financing options, including zero down interest and payments for a year
We work directly with insurance companies for a smoother process
Our commitment to quality and customer satisfaction sets us apart in the roofing industry. We use top-tier materials like Residential Malarkey Emerald Pro to ensure your roof’s longevity and performance.
ROOF MAINTENNACE
Residential Roof Cleaning
As is the case with other parts of the house, regular roofing maintenance is the key to keeping your roof in tip-top condition for decades. The roof is arguably the most important part of your house as it provides protection. The roof is also one of the most expensive parts to repair with even partial re-roofing costing thousands of dollars. Therefore, it is clear why roof maintenance is crucial to any homeowner. GMZ & Sons Roofing LLC, is a residential roofing services company that is always ready to handle any Portland and any local roof maintenance jobs you throw at us. The following are our roofing maintenance services;
Roof Cleaning Portland
Preventive maintenance roof cleaning is even more important than corrective maintenance. Conducting a roof inspection once or twice annually is the first step of preventive maintenance. Not only does it help prevent some of the common roofing problems, it helps detect problems in their early stages when they are easy and cheaper to fix. At GMZ & Sons Roofing LLC, we have a team of roof cleaning inspectors who will examine every inch of your roof to detect even the slightest cracks and fix them immediately. Upon inspection, we replace any missing or broken roofing materials such as shingles, shakes, or tiles to prevent further damage.
A Proper Portland Roof Clean
Over time, there is likely to be a buildup of dust, moss, or algae on your roof.
Moss is that weird green plant that seems to have no roots and only needs a moist, humid area to grow.
Algae also grow like moss but look like black streaks on your shingles.
In addition to being unsightly, Moss and Algae can cause decay and breakdown of the roof tiles and shingles which shortens the lifespan of your roof. A lot of people think that using a pressure washer to blast the moss and algae off the roof is the answer, but that can cause more harm than good. At GMZ & Sons Roofing LLC, we will clean your roof professionally leaving it looking sparkling clean and new.
General Roof Maintenance
It is not uncommon for debris such as leaves and branches to accumulate in the gutters especially if your roof is close to or directly under trees. If you fail to remove such debris especially during the rainy season, water will not move and may rot the fascia and other roof components. At GMZ & Sons Roofing LLC, we offer regular debris removal services to keep your roof free of debris at all times.
Whatever roofing maintenance services you need, our roofing experts at GMZ & Sons Roofing LLC, are up to the task. Our highly trained and experienced roofing experts arrive at your doorstep promptly with all the tools needed for any roof maintenance job you have for us. We guarantee unmatched quality at the best prices in town. Call us now and speak to one of our roofing experts.
RESIDENTIAL ROOF
Reliable Roofing Services for Businesses
Since our company’s establishment in2006, GMZ & Sons Roofing LLC, has provided a plethora of roofing services to Oregon residents and companies. We understand that roofing projects are a huge investment for businesses, which is why we strive to provide Residential roofing that meets the highest industry standards.
We provide our whole range of services to our Residential customers, including roof repairs, replacement, and even new construction roofing. We specialize in the installation of roofs and can work with you to create a custom solution for your new Residential property. We offer deeply dedicated service with personalized attention, so you will feel informed and taken care of at every step of the process.
Our Residential roofing services are typically very custom and cater to your specific needs as a business owner or property manager. Our goal is to provide roofing solutions that go above and beyond your needs to help your business thrive. If you are interested, give us a call, and we will begin the free estimate process, whether you’re interested in a new roof or a simple repair.
Why Choose GMZ & Sons Roofing LLC, For Your Residential Roofing Needs
GMZ & Sons Roofing LLC, installs multiple roof systems designed to fit the needs of a Residential business, including metal roofs. We have provided roofs for Residential buildings, storefronts, restaurants, multi-unit dwellings, including apartment buildings and condo complexes, and more. We have knowledgeable estimators and installers ready to take on the requirements of these complicated jobs.
While much of our Residential work involves roof replacement or new construction, we are also capable of performing repairs and do our best to act urgently when a repair is necessary. We want you to get back to business as usual when you encounter a problem, as we understand how much a leak can impact your tenants, employees, customers, and even your bottom line.
Extraordinary service
Experienced staff
Outstanding workmanship
Reliable products
Quality installation
A smooth process
Consistent follow through
An industry-leading warranty
Committed to Quality
After our team completes a roofing project, a quality control supervisor inspects the final product to ensure nothing was overlooked. We take quality control extremely seriously, which means that we go the extra mile to ensure you are satisfied with your service before we complete a job. We understand how important the functionality, safety, and appearance of your roof are to the well-being of your business.
We have provided pitched Residential roofing for many storefronts and restaurants. If you have a Residential property with a pitched roof, this is our specialty, and we are extremely knowledgeable about roofs of all different types that fall into this category. If you would like to schedule a free estimate with one of our roofing professionals, please contact our office.
ATTIC VENTILATIN SYSTEM:
A Complete Roof System Starts with Proper Ventilation
Upgrade your roof performance with our attic ventilation system
Most roofing problems don’t start on the surface—they start in the attic. Without proper airflow, heat and moisture can build up, leading to premature shingle failure, mold growth, and reduced roof lifespan. That’s why every roof replacement we install is designed as a complete system, not just shingles.
Our GMZ & Sons Roofing LLC, system is engineered to create balanced intake and exhaust airflow, allowing your roof to breathe properly year-round. By combining ridge ventilation, intake vents, and optimized airflow design, we help regulate attic temperature and moisture levels for long-term performance.
Reduces heat buildup that damages shingles
Prevents moisture that leads to mold and rot
Extends the lifespan of your roofing system
Improves energy efficiency and indoor comfort
Designed specifically for homes in the Pacific Northwest
Why It Matters for Your Roof Replacement
Installing a new roof without addressing ventilation can lead to early failure and costly issues down the line. By integrating ventilation into your roofing system, we ensure your investment performs the way it should from day one.
Benefits of Proper Attic Ventilation
Reduces heat buildup
Prevents excessive attic temperatures that can damage shingles and increase cooling costs
Controls moisture and humidity
Helps prevent mold, rot, and structural damage caused by trapped moisture
Extends roof lifespan
Reduces thermal stress and material deterioration over time
Improves energy efficiency
Supports more consistent indoor temperatures and reduces strain on HVAC systems
Common Attic Ventilation Systems
A balanced ventilation system uses both intake and exhaust to allow continuous airflow through the attic. The right combination depends on your home’s structure and roofing system.
- Ridge vents – allow hot air to escape at the peak of the roof
- Box vents – provide additional exhaust ventilation
- Soffit vents – bring in fresh air at the roof’s edge
- Continuous soffit vents – provide consistent intake airflow
Built for Long-Term Roof Performance
A well-balanced attic ventilation system plays a critical role in protecting your roof and home. By controlling heat and moisture, it helps prevent costly repairs, improves energy efficiency, and extends the life of your roofing system.