Roofing Products · Synthetic Underlayment
Synthetic Roofing Underlayment Roof Protection
Synthetic underlayment is the full-deck protective layer installed beneath your shingles, helping support water management and secondary protection across the roof system.
It is not the visible finished roof, but it is one of the roof-system layers we care about because it helps protect the deck before the shingles, flashing, starter, and finishing details are installed.
Why This Product Is Listed Here
We use synthetic underlayment because the roof deck needs protection under the shingles.
Shingles are the primary weather-shedding surface, but the roof system underneath still matters. Synthetic underlayment helps create a cleaner, stronger, more consistent protective layer across the main roof deck before the finished roofing is installed.
It covers the main roof field
Synthetic underlayment is installed across the broader roof deck, working between the deck and shingles as a secondary protective layer.
It supports secondary water shedding
When installed with correct overlaps and roof details, underlayment helps manage incidental water beneath the finished shingle layer.
It gives the roof a better base
A good underlayment helps create a cleaner installation surface, reduces reliance on old felt-style materials, and supports a more modern roof assembly.
It works with the rest of the roof
Underlayment is not a standalone roof. It works with shingles, ice and water shield, starter, flashing, valley metal, ventilation, drip edge, and ridge details.
Preferred RoofNado Underlayment Products
The three underlayments we show here are AnchorDeck, StormTread XW, and Sahara.
This page is not a generic underlayment catalogue. These are the RoofNado underlayment products we choose from when we are building a roof system: AnchorDeck for dependable standard coverage, StormTread XW for a stronger mid-range upgrade, and Sahara when breathable moisture-management performance makes sense for the assembly.
Final product selection still depends on roof slope, roof design, shingle package, ventilation, site conditions, supplier availability, and manufacturer requirements. The point of this page is to show the products we actually use and why each one has a role.
Dependable standard underlayment
RoofNado AnchorDeck
AnchorDeck is the dependable underlayment choice that forms the foundation of the system. It provides consistent water resistance and a stable separation layer between the roof deck and shingles without overcomplicating the assembly.
Standard sloped asphalt shingle roof replacements where the roof needs a reliable full-deck synthetic underlayment layer beneath the shingles.
Mid-range durability upgrade
RoofNado StormTread XW
StormTread XW is the stronger mid-range upgrade we use when the roof system benefits from added durability. It is thicker and more tear-resistant than standard underlayments, giving the installation a tougher layer under long-term stress.
Projects where the homeowner wants an upgraded underlayment package with more toughness, better handling, and stronger durability than a basic synthetic layer.
Premium breathable underlayment
RoofNado Sahara
Sahara is the premium underlayment option for projects where heat and moisture management matter. In Okanagan conditions, the goal is to help trapped heat and moisture release from the roof system instead of building unnecessary long-term stress under the finished roof.
Hot, demanding roof assemblies, premium roof packages, and projects where breathable underlayment and moisture management are part of the roof-system conversation.
Where It Goes
Synthetic underlayment protects the main roof field.
Underlayment is installed before the shingles go on. Its job is to support the roof system beneath the finished surface, not to replace the stronger waterproofing details used at the most vulnerable areas.
Main roof planes
Synthetic underlayment is primarily used across the roof planes beneath the shingles, helping create a continuous roof-field layer over the deck.
Between high-risk membrane areas
Ice and water shield is used at eaves, valleys, and penetrations; synthetic underlayment fills out the remaining roof field around those protected zones.
Beneath shingles and roof accessories
Underlayment sits below the shingle courses, starter, vents, and flashing details as part of the layered roof assembly.
During roof dry-in
Underlayment also helps during the installation process by covering the deck before the finished shingle system is completed.
What It Does Not Replace
Underlayment matters, but it is not the whole roof system.
A better underlayment is valuable, but it cannot make up for missing flashing, poor ventilation, weak shingle installation, bad deck conditions, or incomplete waterproofing at vulnerable details.
Ice & water shield
Synthetic underlayment is not a substitute for self-adhered membrane at eaves, valleys, penetrations, skylights, walls, and other vulnerable roof areas.
Proper flashing
Step flashing, headwall flashing, backpans, counter flashing, valley metal, drip edge, and gutter apron still need to be handled correctly.
Ventilation and deck condition
Moisture problems from the attic side, poor airflow, damaged sheathing, or trapped condensation cannot be solved by underlayment alone.
Shingle installation quality
Correct shingle layout, nailing, starter, ridge cap, sealant use, and roof-detail workmanship still determine how the finished roof performs.
Product Page FAQ
Synthetic underlayment questions.
These answers explain how underlayment fits into the roof assembly and why product choice is only one part of a proper roof installation.
Which underlayment products are listed on this page?
This underlayment page is built around three RoofNado products only: AnchorDeck, StormTread XW, and Sahara. AnchorDeck is the dependable standard choice, StormTread XW is the stronger mid-range upgrade, and Sahara is the premium breathable option for heat and moisture-management discussions.
Is synthetic underlayment the same as ice and water shield?
No. Synthetic underlayment is normally used across the broader roof field. Ice and water shield is a self-adhered membrane used in higher-risk areas such as eaves, valleys, penetrations, skylights, walls, and transitions.
When does AnchorDeck make sense?
AnchorDeck makes sense when the roof needs a reliable standard synthetic underlayment layer across the main roof field beneath the shingles.
When does StormTread XW make sense?
StormTread XW makes sense when the homeowner wants a stronger underlayment upgrade with more durability, better tear resistance, improved handling, and more resilience built into the roof system.
When does Sahara make sense?
Sahara makes sense when a roof assembly benefits from breathable underlayment, heat-management discussion, or moisture-release performance in hot and demanding conditions.
Does synthetic underlayment make the roof waterproof?
No. It adds secondary protection beneath the shingles, but the finished roof still depends on shingle installation, flashing, valleys, penetrations, ventilation, roof slope, drainage, and deck condition.
Does the whole roof get synthetic underlayment?
On a typical sloped shingle roof, synthetic underlayment is used across the main roof field, while ice and water shield is used in the vulnerable areas that need stronger self-adhered protection.
Can underlayment be exposed before shingles go on?
Underlayment can help during dry-in, but exposure limits depend on the exact product and manufacturer instructions. That is why final product choice and installation timing should be confirmed for the project.
Is this page meant to sell a roof replacement?
No. This page supports the broader roofing products section by explaining the underlayment products we choose to use. Service and estimate information belongs on the roof replacement and estimate pages.
Underlayment is one layer in a complete roof system.
The underlayment matters, but so do the shingles, ice and water shield, starter, ventilation, flashing, valley metal, drip edge, gutter apron, and hip/ridge details around it.