Commercial Roofing Services
Cool Roof Installation in Federal Way, WA
Before a reflective roof goes on a Federal Way, WA building, the superintendent walks the deck and asks whether it earns its place. Federal Way has a warm-summer Mediterranean climate, and no month averages above 71.6°F. That means a cool roof does less work here than it would on a building in a hotter region, and the owner should hear that on the first walk. A white membrane still has uses: it can ease the load on rooftop air conditioning during the warm months, and it is often the membrane a project wanted anyway.
After the walk come the core cuts, the moisture scan and the tear-off limits marked in paint. We settle what goes under the reflective surface first, because the surface only works as well as the roof beneath it.
Does a reflective roof pay off in a mild summer?
It can, but the payback is smaller than the brochures suggest. A reflective surface sheds sunlight, which lowers roof temperature in summer and trims the cooling demand of the space below. In a climate with cool nights and a dry July, those savings arrive in a short season. In winter, the same surface gives up a little free heat, and a building that heats more than it cools may see the trade run the other way.
So the owner asks two questions. How much of the building is conditioned, and how much of that is cooled? A warehouse with little air conditioning gains little. A retail building or office with rooftop units running through July and August gains more. We put those facts next to the roof's age and decide whether the reflective surface is a bonus on a replacement already planned or a reason to replace sooner. Often it is the former. The insulation and cover board package under the surface usually matters more to the heating and cooling bill than the color on top.
Surface heat also changes how the roof ages. A cooler membrane expands and contracts less through the day, which eases stress on seams and flashings, and it spares rooftop equipment a little heat. Those gains are real but modest where summers stay mild, so we do not price them as savings. We list them as secondary benefits and leave the decision to the owner.
Which reflective systems do we install?
Most cool roofs are white or light-colored single-ply membranes, such as TPO and PVC, installed over a new insulation layer or a cover board. Others are reflective coatings over a sound existing membrane, including acrylic and silicone systems. Each has its place. A membrane gives a new waterproofing layer. A coating adds a reflective skin to a roof that is already sound.
We choose by the condition of the existing roof. If cores show wet insulation or the seams have failed, a coating will not help, and the answer is replacement or a recover. If the roof is dry and the membrane is sound, a coating can be cheaper and faster. In either case, the surface needs cleaning on a schedule, because dirt and algae lower reflectance over time, and the wet months deposit both. A yearly wash with a cleaner suited to the membrane, plus a look at drains and flashings while the crew is up there, keeps the reflectance close to where it started.
What does the energy code ask for?
The state building code is the 2021 International Building Code with Washington amendments, the most recent effective March 15, 2024. Washington's commercial energy code, set in Chapter 51-11C WAC, is the 2021 International Energy Conservation Code, Commercial. For a reroof, the energy code can set insulation levels and, depending on scope and building type, may bring reflectance requirements into play. We confirm what applies with the plan reviewer before writing the scope.
The code check matters for cost. Insulation thickness changes curb heights, parapet clearances and drain bodies, so a reflective roof that also needs more insulation is a bigger job than the membrane alone. We list those knock-on items in the bid: raised curbs, extended flashings and adjusted drains. The owner sees the full number before the crane is booked.
How do we sequence the install in a wet region?
Annual precipitation reaches 37.1 inches in Auburn (wettest in November and December, driest in July) and about 40.8 inches in Tacoma, spread over roughly 155 wet days. That pattern sets the schedule. The best window for membrane work is the dry stretch that peaks in July, and we try to book reflective installs there. In the shoulder months, we size each day's open area to what we can seal by evening.
The sequence is the usual one. The crew marks tear-off limits, lays out the lay-down yard, picks materials to the roof and removes the old roof in sections. Each section gets insulation, cover board and membrane the same day, with edges fastened and a temporary seal at the limits. A commercial roof replacement with a reflective membrane follows the same order, and the closeout walk checks every seam and tie-in.
Which buildings are the best candidates?
A retail building on Pacific Highway South with rooftop units serving a large floor area, or an office that cools through the summer, stands to gain the most. The Commons indoor mall and the Pavilions Centre strip mall are retail types that fit that profile. A new building in the Woodbridge industrial park, on part of the former Weyerhaeuser campus, can settle the surface color before the roof is built, when the choice of a white membrane costs little more than a dark one.
Warehouses in the Kent Valley, Auburn and Fife see less benefit where the space is unconditioned. We tell the owner so, because the cooling load is the deciding fact. For many owners the sensible path is a reflective membrane when a roof is due for replacement anyway. A Federal Way West Campus owner or a Kent owner can send the plan and the cooling load, and we walk the numbers together.
Commercial Roofing Questions
Will a white roof make my winter heating bills rise?
A little, in a building that heats more than it cools. A reflective surface sheds some winter sun that a dark one would absorb. In this climate the effect is small either way, and insulation thickness matters more. We compare the building's heating and cooling use before recommending the surface.
How often does a reflective membrane need cleaning?
Plan on a wash every year or two, and more often under trees or near heavy traffic. Wet months leave dirt and algae that lower reflectance. We recommend cleaners suited to the membrane and note the date in the roof file.
Can I coat my existing roof to make it reflective?
If the membrane is sound, the insulation is dry and the seams are tight, yes. A coating over a failing roof wastes money. Cores and a moisture scan tell us which case we have before we price anything.
Does a cool roof change the warranty?
Manufacturers set conditions for each system, including surface preparation and approved coatings. We build to the manufacturer's installation requirements and keep the records. The manufacturer decides what a warranty covers.
Is there a best month to install?
July is the driest month in the region, so summer is the first choice. We can work in other months by sizing each day's open area to what we can dry in by evening.
Send the roof plan and the cooling load
Send the roof plan, the age of the existing system and the rooftop unit list, along with the project schedule, so we can walk the sequence, staging and tie-ins with your superintendent before a number goes on paper.
