
Siding
Shadow Line+
The Envello Shadow Line+ siding board is molded from real oak masters and designed to perfectly replicate smooth timber with a flat grained finish, giving a clean authentic look. The increased width of the Shadow Line+ board compared to standard wooden boards means there is larger grain detail. This gives an enhanced visual impact, without risk of the board twisting or warping over time.
Shadow Line+ siding boards are certified for use in WUI zones, per CalFire. They have been tested to ASTM E84, and have a Class A flame spread rating*
This product is part of our Composite Siding collections.




Siding
Shadow Line+
The Envello Shadow Line+ siding board is molded from real oak masters and designed to perfectly replicate smooth timber with a flat grained finish, giving a clean authentic look. The increased width of the Shadow Line+ board compared to standard wooden boards means there is larger grain detail. This gives an enhanced visual impact, without risk of the board twisting or warping over time.
Shadow Line+ siding boards are certified for use in WUI zones, per CalFire. They have been tested to ASTM E84, and have a Class A flame spread rating*
This product is part of our Composite Siding collections.
Golden Oak
Increased thermal performance
The unique composition enhances thermal performance.

Hand molded & colored
Skilfully hand-crafted to ensure a high quality, premium product.
Natural wood look
Molded from selected oak for an organic, realistic wood-grain appearance.
Recycled materials
Recycled materials and renewable biopolymers are used within our boards.
Integrated UV stabilizers
UV stabilized for better performance and fade resistance over time.

Wood free
Wood free composition prevents rot, warping and insect infestation.
Low maintenance
No staining or oiling needed. Only seasonal cleaning required.
Mold resistant
Unlike wood, it is actively resistant to mold and fungus.
Impact & weather resistant
Elastomeric surface ensures increased resilience against natural weathering.
Easy to install
Can be cut and installed easily when following product guides.
Moisture resistant
Due to the non-porous composition, no sealing is required.
Maximum durability
Fiber reinforced core provides strength and durability whilst reducing weight.
WUI Certified
Suitable for use in wildland urban interfaces areas, when installed in accordance with the install guide.
DOWNLOADS
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Look Book US
Look Book US -
Envello Shadow Line Plus DWG
Envello Shadow Line Plus DWG -
Envello Shadow Line Plus PDF
Envello Shadow Line Plus PDF -
Shadow Line+ ASTM E84
Shadow Line+ ASTM E84 -
Millboard Envello Siding WUI
Millboard Envello Siding WUI -
NFPA 268 Millboard Shadow Line+
NFPA 268 Millboard Shadow Line+ -
Reveal Board R-Value Thermal Resistance - ISO 8301 EN 12664
Reveal Board R-Value Thermal Resistance - ISO 8301 EN 12664 -
DrJ Report - Millboard Company Ltd - Millboard Composite Siding Products - 2304-117
DrJ Report - Millboard Company Ltd - Millboard Composite Siding Products - 2304-117 -
Shadow Line+ R-Value Thermal Resistance - ISO 8301 EN 12664
Shadow Line+ R-Value Thermal Resistance - ISO 8301 EN 12664 -
Shadow Line+ Horizontal Install Guide_US
Shadow Line+ Horizontal Install Guide_US -
Shadow Line Plus Vertical Install Guide_US
Shadow Line Plus Vertical Install Guide_US -
Shadow Line+ Spec Sheet_US
Shadow Line+ Spec Sheet_US
Frequently asked questions
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