Project fit
Review roof covering, deck, slope, ventilation and applicable local requirements.
LAYVEX RB · ROOFING UNDERLAYMENT
Mechanically attached reflective roofing underlayment.
A reflective roofing underlayment for suitable new-roof and re-roof projects, supplied in 450 sq ft rolls.
MECHANICALLY ATTACHED FORMAT
Reflective roofing underlayment for your crew.
LAYVEX RB is a mechanically attached reflective roofing underlayment. Evaluate its reflective surface and roofing-underlayment role using current product-specific documentation.
Plan fastener selection, lap details and installation around the current RB instructions and project requirements.
- Roll format
- 4.5 ft × 100 ft
- Gross roll area
- 450 sq ft / 4.5 squares
- Attachment
- Mechanically attached
Gross roll area is not net installed coverage. Allow for required overlaps and project details.
PRODUCT-SPECIFIC TECHNICAL INFORMATION
LAYVEX RB testing references.
The following summarizes the supplied RB specification sheet.
| Test reference | Reported product information |
|---|---|
| ASTM D226/D226M-17 | Breaking strength: pass. Reported averages: 83.84 lbf machine direction and 61.85 lbf cross-machine direction. |
| ASTM D226/D226M-17 | Pliability: no rupture reported in machine and cross-machine directions. |
| ASTM D5147/D5147M-17 | Unrolling: pass. |
| ASTM D774 | Mullen burst: 130 psi. |
| ASTM C1136 | Reported tensile strength: 65 lb/in in both directions. |
| ASTM E84 | Reported surface-burning results: Class A flame spread and Class 1 smoke developed. |
| ASTM E96, Procedure A | Reported permeance: 0.0 perm. |
ASTM E84 surface-burning results are not a Class A roof-assembly fire rating. Listed references and results do not establish approval for every roof assembly or jurisdiction.
BEFORE YOU SPECIFY
Confirm the complete roof assembly.
Installation details
Use current product instructions for laps, attachment, penetrations and exposure limits.
Performance context
Reflective performance depends on assembly and air spaces. Surface properties alone do not establish installed-system performance or energy savings.
BEFORE YOU GET STARTED
Questions business owners ask.
What is the difference between LAYVEX RB and SA?
RB is mechanically attached reflective roofing underlayment. SA is self-adhered reflective roofing underlayment and an ice and water shield. Select the product for the intended roof assembly using current project-specific documentation.
How much material is on each roll?
RB is 4.5 ft × 100 ft, or 450 sq ft (4.5 squares) per roll. SA is 4 ft × 60 ft, or 240 sq ft (2.4 squares) per roll. These are gross roll areas. Installed coverage is reduced by required overlaps and project details.
Is LAYVEX the same as ELEVATE attic insulation?
No. LAYVEX is roofing underlayment for suitable roofing projects. AttiicELEVATE™ is Advanced Multi-Layer Reflective Insulation designed for residential attic applications. They have different applications and installation requirements.
Does a reflective surface guarantee energy savings?
No. Thermal performance depends on the roof assembly, air spaces, ventilation, climate and installation. Surface properties alone do not establish installed-system performance or energy savings.
What should be considered for a roofing project?
Consider the roof covering, substrate, slope and local requirements. Follow current product-specific installation instructions.
GROW WITH THE ATTIIC ECOSYSTEM
Expand What Your Business Can Offer.
Connect your business with products, distribution infrastructure, sales resources and MLIVE technology.