Confidence that you are covered.

If you own or manage a commercial or government property, you know the burden of responsibility to ensure your structure is sound. Your tenants or team is relying on a dry and secure roof so that their operations aren’t disrupted, not to mention the liability behind leaks, falling debris or worse.

Whether its new construction, repair, restoration or maintenance, the skilled and experienced team of Preferred Roof Services is accustomed to the complexities of commercial and government processes. We are well recognized across Western Washington for our attention to accurate budgeting, time management and accountability to exceed expectations in every project we take on.

roof repair

Roof Repair

There are a variety of reasons why you may need a roof repair. Whether it’s a leak resulting from storm damage, pests, or just typical wear and tear, it’s never convenient but it pales in comparison to the cost of ignoring the impact of what your roof has endured over the years.

Before fixing your roof, we first conduct a careful examination of its current condition. We determine what has caused the problem and identify the exact points and areas of your roof that need to be repaired. Another benefit to roof repair is to extend the life of the current roof until the time of a full re-roofing is budgeted for.

Our roof systems come in a wide range of colors, styles, and thicknesses, allowing flexibility and customization. Matching your roof perfectly with your building's style and r palette is worry-free. As a certified roofer, Preferred Roof also offers access to solid manufacturer warranties for as long as 30 years (depending on the manufacturer).


Commercial Asphalt Shingles

Government buildings such as courthouses, fire and police stations, detention centers, museums, and libraries need a roof repair or roof replacement done right the first time. We provide affordable and reliable government roofing services for federal, state, city, county, or other municipal buildings in the Greater Seattle area including in Lacey, Tacoma, Puyallup, Auburn, Fife, Federal Way, Milton, Lakewood, Olympia, Bothell, Kirkland, Bellevue and all other cities in King, Pierce, and Thurston counties.

Large community buildings require extensive asphalt shingle roofing systems. Our expert technicians install a steep slope asphalt shingle roofing system starting with high-quality underlayment to protect from the elements for years to come.

ply roofing

Single Ply Membrane

Preferred Roof has been providing expert installation of single-ply membrane roofing systems for low slope commercial projects throughout the Pacific Northwest. We install PVC, TPO & EPDM single-ply membrane roofing systems for low slope roofs on commercial and government buildings, buildings using only the highest quality products from the industry’s most trusted manufacturers.

EPDM Single Ply Membrane Roofing
The EPDM (ethylene propylene diene terpolymer) single-ply rubber roofing membrane has been an appealing choice of the low-slope commercial roofing industry for over 40 years. EPDM has gained industry-wide acceptance and respect by providing immediate and long-term roofing solutions. As environmentalists and code regulators place more emphasis on the sustainable performance of building materials, EPDM continues to be the roofing material that stands the test of time.

PVC Single Ply Membrane Roofing PVC is a roof membrane composed of only one layer of material, polyvinyl chloride. PVC roofs are specially designed to withstand ponding water - PVC membrane is welded together with hot air (no open flame) to eliminate all seams to prevent moisture from passing through. PVC roofing systems also reflect nearly 80% of the heat of the sun, lowering energy costs substantially.

TPO Single Ply Membrane Roofing TPO membranes are fully adhered to the substrate using a special adhesive. The membrane is loose laid over the top of the roof, sealed at all penetrations and around the perimeter, and then a ballast is put on it to hold it in place. Mechanically-attached membranes are most common and use multiple type of special screws and plates to secure the system.

sbs roofing


We are expert installers of SBS, APP and BUR roofing systems for commercial and residential projects. We have hundreds of satisfied customers up and down the I-5 corridor and throughout Western Washington.

SBS/APP Modified Bitumen Roofing
In the 1970s, technological advances in asphalt sciences led to the development of modifiers such as APP (atactic polypropylene) and SBS (styrene-butadiene-styrene) which, when added to unblown (unoxidized) asphalt, impart either plastic (APP) or rubber (SBS) characteristics. These additives provide enhanced performance characteristics to traditional asphalt. When coupled with reinforcements, such as polyester (superior elongation abilities) or fiberglass (high tensile strength), they create high-performance roof membranes.

APP-modified bitumen membranes are self-adhering when heated using a roofing torch. SBS modified bitumen membranes can be formulated for torch application, but are more commonly applied using hot asphalt or cold SBS modified bitumen adhesive. The result is a BUR system with significantly enhanced performance capabilities. Continuing improvements in technology have also resulted in self-adhering SBS roof membranes.
When an SBS or APP cap sheet is combined with traditional BUR base sheets and interply sheets, the result is a hybrid roof offering the best of both systems – multiple plies and superior performance and longevity.

BUR Roofing
A traditional built-up roofing (BUR) system derives its name from the building of a roof on-site using layers of base sheet, interply sheets and cap sheet or other surfacing such as gravel or liquid coating. Hot asphalt (bitumen) is the bonding and waterproofing agent between layers. BUR is suitable for most low slope roofing applications. The higher the quality of the BUR materials and asphalt used and the greater the number of plies (and separate asphalt moppings), the more superior the roofing system.

metal retrofit

Metal Retrofit

We specialize in creating custom commercial roofing systems for each and every project we work on. After contacting Preferred Roof for a commercial retrofit, our highly trained estimating department will site visit each location and through multiple testing procedures aid in determining if your building can be retrofit with a new roofing system or if removal is required.

What Is A Commercial Retrofit Roof?
Commercial retrofitting of an existing system can be accomplished through a variety of new systems being applied over the existing system to restorative the existing system extending its usable life. Retrofitting a roof system is a very common practice and can lower your costs because the disposal and waste fees are lessened. Your new commercial retrofit roof from Preferred Roof may also extend the life expectancy of existing products such as insulation, flashing and sheet metal that is often disposed of in the traditional commercial roof replacement process.

Retrofit is a Green Energy Solution Retrofitting can also allow for a green technology roofing system to be added to the existing roof system. As business owners are transitioning to LEED Certified (Leadership in Energy & Environmental Design) designs, many business owners find their margins when selling or renting these commercial buildings increase in revenue because of the high value of the LEED Certified design.

Preferred Roof has years of successful installations of LEED Certified commercial retrofit roofs throughout the Northwest! There is no better choice than Preferred Roof when it comes to choosing a commercial roofing contractor for your commercial retrofit.

How to get a Retrofit Roof After contacting Preferred Roof for a commercial retrofit, our highly trained estimating department will site visit each location and through multiple testing procedures aid in determining if your building can be retrofit with a new roofing system or if removal is required. Each location will be assessed by a sampling of the system and if necessary, moisture scans of the roof system will be performed to find hidden moisture and damage to the existing roofing system, insulation, and/or decking system.

residential and multifamily

Residential & Multifamily

Building new or repairing worn roofs of residential homes and multi-family residences



Preferred Roof specializes in commercial and residential skylight installation, providing optimal lighting and a more energy-efficient environment.


Contact us today for expert consultation