Close-up view of the top of a dark ribbed or grooved surface, resembling industrial or architectural materials, with repeated patterns extending out of focus in the background—like an AccuVent attic ventilation system.

AccuBlock® Attic System

AccuBlock is designed for unventilated attic spaces, providing a seal between the top plate and roof sheathing where attic insulation is most vulnerable. It offers a quick and inexpensive solution for architects, builders, and renovators to ensure proper insulation performance for better energy efficiency and indoor air quality.

The AccuBlock system provides an efficient spray template at the top plate and is adaptable for any roof pitch or truss size. It installs quickly and easily with just a few staples and is manufactured from 100% recycled, flame-retardant PVC.

A close-up of a roofing installation showcases AccuBlock, with a black, grid-patterned underlayment being applied to a wooden roof structure. Metal brackets are visible, securing the wooden beams together and ensuring proper assembly for an efficient roof ventilation system.
Unvented Applications
Specially designed for use with spray foam
Ideal substrate for new projects
Conforms to ENERGY STAR®, LEED®, & EPA Indoor airPLUS best practices
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Features

a graphic demonstrating the superior insulation performance of the AccuBlock Roof Ventilation System
Superior Insulation Performance

By seamlessly connecting the top plate to the roof sheathing for a clean, tight soffit edge, AccuBlock eliminates the need to create a time-consuming “soft wall” and ensures insulation effectiveness.

A person wearing a red shirt is installing an AccuBlock roof ventilation system on the underside of the roof in an unfinished attic. The roof structure is visible, including wooden beams and insulation material.
Quick & Easy Installation

AccuBlock is the preferred choice for insulation contractors looking to improve installation speed and efficiency. Since it is unaffected by the chemical and thermal properties of spray foam, it provides an ideal spray template at the top plate.

a graphic demonstrating the design flexibility in the accublock roof ventilation system
Design Flexibility

AccuBlock resists moisture and wind, allowing it to be utilized in both traditional and cathedral ceiling applications.

an image showing a close up of the self-extinguishing material used on the AccuBlock Roof Ventilation System
Self-Extinguishing Material

Made from rigid PVC, AccuBlock has been designed with safety in mind as the material is flame retardant and self-extinguishing.

AccuVent & AccuBlock Specifications

ProductDiagramPart NumberDimensions Depth X Width X Length (inches )Airflow (sq/in)
Original AccuVent
ACBP11739
1.5 x 22.5 x 41 (24 OC)
25.7
Original AccuVent
ACBP11754
1.5 x 14.5 x 41 (16 OC)
15.5
High Energy
AccuVent
ACBP18415
1.5 x 22.5 x 50 (24 OC)
25.7
High Energy
AccuVent
ACBP18429
1.5 x 14.5 x 50 (16 OC)
15.5
AccuVent Cathedral
Ceiling
ACBP18426
Starter Strip 1 x 14.5 x 48 (16 OC)
13.1
AccuVent Cathedral
Ceiling
ACBP18446
Starter Strip 1 x 22.5 x 48 (24 OC)
20.3
AccuVent Cathedral
Ceiling
ACBP18425
Extension 1 x 15 x 48 (16 OC)
13.1
AccuVent Cathedral
Ceiling
ACBP18445
Extension 1 x 22.5 x 48 (24 OC)
20.3
AccuBlock
ACBP18601
Starter Strip 1 x 22.5 x 24.5 (24 OC)
N/A
AccuBlock
ACBP18445
Extension 1 x 22.5 x 48 (24 OC)
N/A
AccuBlock
ACBP18600
Starter Strip 1 x 14.5 x 24.5 (16 OC)
N/A
AccuBlock
ACBP18425
Extension 1 x 15 x 48 (16 OC)
N/A
Specifications table not found.

Articles & Literature

AccuVent Installation
AccuVent: Frequently Asked Questions
Why do I need AccuVent? AccuVent acts as an all-in-one wind-wash barrier and vent. Without a wind-wash barrier, air enters the attic freely and flows above the insulation in the […]
Read Article
Literature
AccuVent - How It Stacks Up AccuVent Product Application
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