Solar reflectance
The fraction of incoming solar energy a roof surface reflects. Request both initial and aged values for the exact grade and surface finish; a white sample is not a substitute for a test result.
White roofing membrane · Commercial & industrial roofs
White TPO Roof Membrane for Reflective Roofing
DERFLEX supplies white thermoplastic polyolefin (TPO) roof membrane rolls for flat and low-slope commercial roofing. Specify a high-reflectance surface alongside the right reinforcement, thickness, hot-air-welded seams and system documentation—not on color alone. Discuss white TPO roofing supply for warehouse roofs, industrial facilities, retrofit programs and distributor orders.
Reflective whiteEvaluate measured cool-roof properties
Heat-weldableCompatible TPO lap construction
Project-definedThickness, roll size & backing
1.2–2.0 mmPublished thickness directions*
2 / 3 / 4 mPublished width directions*
20 / 30 / 50 mPublished length directions*
WhiteReflective surface direction
01 / MATERIAL BRIEF
What the material does
One white roof surface. Several critical buying decisions.
What is a white TPO roof membrane? It is a single-ply thermoplastic polyolefin sheet used as the exposed waterproofing layer of a flat or low-slope roof. A white upper surface typically reflects more incident sunlight than darker alternatives, while appropriately designed heat-welded laps help provide a watertight field membrane.
In a commercial specification, the sheet is only one part of the system. Reinforcement, thickness over scrim, membrane attachment, insulation, flashing details and tested roof-assembly approvals also matter. For the broader product family, see DERFLEX's TPO membrane supply overview.
02 / REFLECTIVE PERFORMANCE
Design the roof, verify the data
White is the visual choice. Verified reflectance is the performance choice.
White TPO roofing is often considered where solar heat gain matters, particularly over large roofs in cooling-dominated regions. Energy performance cannot be validated by appearance alone: evaluate the exact offered membrane and the whole building context.
Thermal emittance
The ability of the roof surface to release absorbed heat as thermal radiation. It is distinct from solar reflectance; both help characterize a cool roof.
Solar Reflectance Index
SRI combines reflectance and emittance into a standardized comparative measure. Confirm the local requirement, aging convention and test documentation before specifying an SRI target.
Important: No DERFLEX-specific reflectance, thermal-emittance, SRI, CRRC listing or energy-saving percentage is claimed here without verified data for the exact white membrane grade. A CRRC rating describes measured radiative properties; it does not by itself certify an entire roof assembly.
03 / APPLICATION-TO-SPECIFICATION
Selecting by roof conditions
Match the white membrane to the building—not just the color swatch.
Different roofs place different demands on membrane thickness, seam layout, walking exposure and supporting documents. Use this matrix to frame the project enquiry; final selection remains subject to the qualified roof-system designer and local requirements.
Warehouse & logistics rooftops
Priority: reflective coverage over a large, exposed roof with manageable installation logistics. Review sheet width, roll handling, wind-zone design and documented radiative values.
Ask: Will wider rolls reduce seams without overloading the handling plan?
Factories & industrial buildings
Priority: roof penetrations, rooftop services, maintenance traffic and exposure conditions. Review membrane reinforcement, cover board and protection walkways where necessary.
Ask: How is traffic protection incorporated into the approved assembly?
Commercial roof replacement
Priority: existing deck, moisture condition, insulation condition and compatible recovery method. Confirm tear-off or recover feasibility with the design professional before fixing the membrane construction.
Ask: Is the proposed backing / attachment approved for the existing roof?
Retail, institutions & public facilities
Priority: fire and wind requirements, installation disruption, temperature conditions and submission quality. Request project-specific assembly documents rather than generic marketing certificates.
Ask: Which full-system approvals and submittals must be supplied?
Warm and cooling-dominated climates
A reflective white roof may reduce absorbed solar energy, but savings depend on insulation, weather, HVAC demand, maintenance and the roof's actual tested radiative properties.
Cold or heating-dominated climates
Reflectivity can introduce a winter heating trade-off. Compare expected annual building energy performance instead of assuming that the whitest roof always provides the lowest energy bill.
04 / PRODUCT SPECIFICATION
Technical purchasing reference
White TPO membrane specification checklist
The following are published DERFLEX supply directions or procurement fields—not a promise that every thickness, width and length combination is stocked or certified. Confirm the offered grade and technical data before issuing a purchase order.
| Specification | Published / proposed direction | What a buyer should verify |
|---|---|---|
| Material | Thermoplastic polyolefin (TPO), exposed single-ply roof membrane | Exact formulation and intended roofing application |
| Color | White roof-facing surface | Approved color sample and measured initial / aged radiative data if required |
| Nominal thickness | 1.2, 1.5, 1.8, 2.0 mm: DERFLEX published TPO directions | Exact grade, nominal versus minimum thickness, tolerances and method of measurement |
| Reinforcement | Reinforced TPO direction; project-specific alternative constructions require review | Scrim design, coating thickness above reinforcement, intended attachment system |
| Roll width | 2 m, 3 m, 4 m: published supply directions | Grade-specific production width and site lifting / handling limits |
| Roll length | 20 m, 30 m, 50 m: published planning directions | Roll area, finished mass, core, packaging and number of rolls per pallet |
| Field seams | Hot-air weldable TPO | Lap geometry, weld procedure, equipment, test-weld checks and inspection plan |
| Attachment | Mechanically attached / adhered or other suitable designed TPO assembly | Deck, insulation, adhesives or fasteners, perimeter, wind and fire approval |
| Testing / standards | ASTM D6878/D6878M may be relevant for reinforced exposed TPO sheets | Current required edition, exact grade test report and local tender criteria |
| OEM & export | Roll labels, packaging and distributor requirements for review | Batch marks, pallet plan, destination, required documents and order quantity |
Thickness caution: 60 mil is 1.524 mm by unit conversion; that does not automatically make any 1.5 mm product a tested or approved 60 mil specification. If the tender requires a particular imperial thickness class, specify the governing designation, tolerances and thickness-over-scrim requirements. See DERFLEX's 60 mil TPO purchasing guide.
05 / ROOF CONSTRUCTION
Material and assembly compatibility
The white surface is only the uppermost layer of the decision.
Why reinforcement matters
For common commercial field membranes, the TPO sheet includes reinforcing fabric or scrim. That reinforcement contributes to dimensional stability and handling strength. The exposed upper ply, scrim position and thickness above scrim may be evaluated independently of nominal overall sheet thickness.
Where a project cites ASTM D6878/D6878M, note that the standard covers reinforced TPO roofing sheets. It does not approve the entire assembled roof against fire, wind uplift, substrate compatibility or field-welding requirements. Review DERFLEX's reinforced TPO roofing membrane details when specifying a scrim-reinforced material.
Welding is a process, not a product adjectiveQualify welding temperature, travel speed, pressure, weather conditions, trial welds and inspection procedure for the offered sheet.
Flashing and field membrane are different tasksPenetrations and corners may require dedicated detail materials, prefabricated accessories and compatible protection systems.
Approvals belong to the entire constructionFire classification and wind resistance depend on the tested configuration, deck, insulation, adhesives, fasteners and details.
WHITE TPO MEMBRANE · reflective exposed surface
REINFORCING SCRIM · within selected membrane
COMPATIBLE COVER BOARD / SUPPORT LAYER
THERMAL INSULATION · as specified
ROOF DECK · designed substrate
Diagram is an explanatory simplification. Scrim is incorporated inside the membrane and is not a separate field-installed layer. The actual assembly may include attachment components and vapor-control layers and must follow project-approved drawings.
06 / PROCUREMENT RISK CONTROL
What to verify before approval
Six details that prevent expensive white TPO roofing mistakes.
White color without radiative data
Do instead: Specify whether you need initial and aged solar reflectance, thermal emittance, SRI or a particular rating. Confirm the exact grade rather than relying on the appearance of a sample.
Nominal thickness mistaken for minimum thickness
Do instead: Record the governing mm or mil designation, tolerance and the requirement for thickness over reinforcement; compare like-for-like test reports.
Product data confused with roof-system approval
Do instead: Separate sheet-level testing from project fire, wind and installation requirements. Refer to the ASTM D6878 reinforced TPO specification guide when drafting a technical request.
Oversized rolls added without a lifting plan
Do instead: Balance nominal seam reduction against roll mass, rooftop access, wind handling and installation labor. Consult the TPO roll width, length and weight guide.
Surface reflectance assumed to remain unchanged
Do instead: Evaluate aged ratings, site dirt exposure, drainage and a safe maintenance plan. Soiling and weathering can change roof-surface radiative performance.
Installation method selected after procurement
Do instead: Confirm the attachment concept, substrate, seam detailing, compatible accessories and design responsibilities before finalizing the white membrane purchase.
07 / ENGINEERING & COMMERCIAL SUPPLY
A clear route from specification to shipment
Build a repeatable sourcing program around a defined roof membrane grade.
Define roof conditions
Record climate, building type, area, roof assembly and required energy, wind or fire documentation.
Approve material direction
Review white sample, thickness, reinforcement, radiative evidence and the exact product description.
Confirm logistics
Agree roll format, total volume, palletization, labels and destination requirements.
Release against documents
Verify any specified test reports, acceptance conditions, batch identifiers and export documents.
Manufacturing-focused support
Why project buyers approach DERFLEX
DERFLEX's existing TPO portfolio covers different membrane thicknesses, reinforced material directions, roll formats and project-oriented procurement. For importers, contractors and roofing-material distributors, this provides a basis for discussing a precise product specification rather than simply ordering “white TPO”.
- Material discussion: membrane construction, thickness and reinforcement selection.
- Commercial coordination: roll width, length, quantity and export packaging.
- OEM discussion: label, markings and repeat-order packaging requirements.
- Document review: buyer-specified test methods, reports and approvals for the exact offered grade.
- Transparent confirmation: project MOQ, lead time, stock and certifications to be agreed in the quotation, not assumed.
Project quotation
Specify your roof. Request the matching white TPO membrane.
Send enough information to make the first quotation technically meaningful. Our team can review your requested white membrane construction, roll format and procurement documents before discussing supply.
Quotation opens the existing DERFLEX request page. No non-functional form is embedded here.
08 / BUYER QUESTIONS
Frequently asked questions
White TPO roofing: answers before you place an order.
Is white TPO roofing more reflective than gray or tan TPO?
White TPO is commonly selected when maximizing roof-surface reflectance is the primary color objective. Exact performance varies by product formulation and aging, however. Compare product-specific initial and aged solar reflectance, thermal emittance and SRI rather than assuming that all white membranes perform equally. The broader comparison is covered in DERFLEX's TPO roofing color and reflectivity guide.
Does white TPO roofing automatically satisfy cool-roof codes?
No. Building codes and procurement standards may require measured values, aged performance or a specified rating. A white appearance by itself does not establish compliance. Check the jurisdiction, exact product and applicable test or rating documentation.
What thickness of white TPO membrane should I specify?
Choose thickness according to the project specification, approved roof assembly, traffic exposure and relevant test requirements. DERFLEX publishes 1.2, 1.5, 1.8 and 2.0 mm TPO directions, subject to exact-grade confirmation. For a 60 mil tender, specify the governing thickness definition and tolerance rather than substituting a nominal 1.5 mm figure without review.
Can white TPO membrane be heat welded?
Yes. Commercial TPO roofing sheets are designed for compatible heat-welded field seams. Good results depend on membrane grade, surface condition, equipment settings, site temperature, overlap details, trial welds and inspection. Follow the roof-system manufacturer's approved installation instructions.
Is white TPO suitable for low-slope commercial roofs?
White TPO membrane is widely used for exposed, low-slope commercial roof systems. Suitability depends on slope and drainage, attachment, insulation, deck compatibility, flashing details, local codes and project-specific system approvals. The sheet alone cannot establish whole-roof suitability.
Will the white surface stay equally reflective over time?
Not necessarily. Dirt, biological growth, local atmospheric deposits and weathering can affect reflectance. Review aged radiative data where specified and plan maintenance based on the roof-system provider's approved procedures.
Does ASTM D6878 compliance prove wind or fire approval?
No. ASTM D6878/D6878M addresses reinforced TPO sheet material properties. Roof-system wind resistance, fire classification and installation compatibility require separate assembly-level evaluation and applicable approvals.
Can DERFLEX supply custom white TPO rolls for wholesale orders?
DERFLEX publishes TPO membrane directions covering multiple thicknesses, widths and lengths and discusses OEM or project-specific supply. Share the required construction, grade, roll format, quantity, market and document package to confirm manufacturing feasibility, MOQ, timing and final pricing.