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roof ventilation

The Techni-Flo® Engineered Roof Ventilation System is the leading steep-slope roof ventilation solution. This state-of-the-art roofing ventilation system is engineered to ensure maximum airflow performance by balancing the intake and exhaust of steep-slope roofing applications. Roof ventilation of steep-sloped buildings is essential to maintain roof system durability and thermal performance. The Techni-Flo® engineered ventilation system provides balanced airflow to maximize building performance and exhaust the threat of moisture. Proper ventilation will help preserve the life of your roof.

Roof Ventilation Components

Atlas Roofing Corporation manufactures a full line of engineered roofing solutions that are an integral part of the Atlas complete roofing system. The Techni-Flo® Engineered Roof Ventilation System consists of 4 parts: Techni-Flo® EV, ACFoam® CrossVent®, Atlas Nail Base Fastener and Techni-Flo® RV.

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Techni-Flo Ridge Vents

The Techni-FloTechni-Flo® RV (ridge vent) exhaust ventilation is engineered to ensure a perfect fit and optimum performance for every roof condition. Featuring an easy to install snap on cover, this all-metal ridge vent can withstand heavy snow-loads and wind-driven rain. Techni-Flo® RV features slotted fastening holes for easy installation and proper fastener placement.

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CrossVent Nailable Insulation

Atlas ACFoam® CrossVent® combines the performance of a cross-ventilating air space, nailable roof substrate and thermally efficient polyiso insulation.  ACFoam® CrossVent® consists of ACFoam®-II or ACFoam®-III polyisocyanurate (polyiso) insulation board and a min. 7/16” APA/TECO rated OSB or min. 19/32” CDX plywood separated with and bonded to 5 individual 1.0”, 1.5” or 2.0” vent spacer strips.
ACFoam® CrossVent® is available with an FSC® Certified wood layer upon request.

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Atlas Nail Base Fastener

Atlas Nail Base Fasteners are specially engineered for attaching Atlas ACFoam® CrossVent® and ACFoam® Nail Base Roof Insulation to an approved substrate. Featuring a large, pancake style head with a 6-lobe drive, Atlas Nail Base Fasteners drive quickly and smoothly, and secure panels without the need of a washer. Atlas Nail Base Fasteners are available in three styles for use in wood, corrugated steel and steel members without pre-drilling.

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Techni-Flo Eave Vents

Techni-Flo® EV is engineered for individual jobs to provide a prescribed roof ventilation capacity. This allows air to flow through the ACFoam® CrossVent® panel to the eave, heat and moisture to evacuate, and temperatures of the roof covering to be moderated. This, combined with proper eave ventilation, leads to a longer life for the roof. It also features slotted fastening holes for proper thermal movement and correct fastener placement.

Techni-Flo® EV is not intended for attachment to open ended metal truss or metal bar joist applications.

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The Benefits of Roof Ventilation

Techni-Flo  Diagram

In many cases, the airflow through ventilating nail base products is minimized because the eave and ridge vents do not match their roof ventilation capacity. Only Techni-Flo™’s Engineered Roof Ventilation system ensures airflow through the ventilation space because the eave, ridge, and insulation venting capacity are designed as a system. The chart below gives a comprehensive look at what the Techni-Flo™ Engineered Roof Ventilation System offers over other roof systems.

Generally roof ventilation systems contain products from several different manufacturers, and therefore compatibility and performance are hard to ensure. The benefits of those roof systems are hard to ascertain. Installing the Techni-Flo™ Engineered Roof System is the surest way to maximize roof ventilation, moderate roof cover temperatures, and promote durability.

  Standard Ventilating
Nail Base Product
Techni-Flo™ Ventilation
System with CrossVent®
Airflow through the nailable
roof insulation

Contains products that meet
FSC® Chain of Custody Certification requirements

Pre-assembled products that allow for fast installation and low labor costs

Products custom manufactured
for individual projects
Designed as a system for consis tent intake and exhaust airflow underneath roof    Techni-Flo
Designed to work as a system
to ensure maximum airflow
20 year limited warranty covering:
ventilation, wind, thermal, and finish

Resources To Help You Calculate Airflow

Ventilated Roof System Calculator
Net Free Area Calculator