# Roofing Ventilation Calculator > Attic ventilation calculation tool based on NFA 1/300 rule. (iPhone/iPad app by Compagnie de Saint-Gobain.) - Source: https://appshunter.io/ios/app/roofing-ventilation-calculator/id1035643148 (this page in markdown: same URL + `.md`) - Developer: [Compagnie de Saint-Gobain](https://appshunter.io/developer/543924473) - Category: Business, Utilities - Price: Free - Rating: 3.00/5 from 6 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 34 MB - Languages: English - Released: 2015-09-11 - Data updated: 2026-06-19 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/roofing-ventilation-calculator/id1035643148/reviews.md ## What is Roofing Ventilation Calculator? The Ventilation Calculator from CertainTeed is the ideal tool for quickly determining the amount of ventilation products needed to outfit an attic space with proper balanced ventilation. Simply enter the length and width of the attic space or the overall square footage of the space and the Ventilation Calculator produces results based upon the NFA 1/300 rule. ## Key features - Attic dimension input - Square footage input - NFA 1/300 rule calculation - Ventilation product quantity determination - Balanced ventilation planning ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/roofing-ventilation-calculator/id1035643148/reviews.md ### 1/5 — Useless *2026-04-22, version 2.1.19* This app only calculates the total attic ventilation requirement based on the 1/300 guideline - which doesn’t require an app to figure out. What the app should do Is calculate the ventilation obtained using specific soffit and ridge vent types, which is what you need. ### 1/5 — A multi-million dollar company and this poor excuse of an app *2026-01-07* I can’t help but laugh at this. Seriously? ### 1/5 — Doesn’t work *2022-06-02, version 2.1.2* Typical of these kinds of businesses, they never follow through with software tools for contractors. So we have to find other alternatives. ### 1/5 — Roofing calculator *2020-08-30, version 2.1.2* The app doe not open on iPhone and does not calculate on iPad. Completely worthless app ## Frequently asked questions about Roofing Ventilation Calculator ### What is the Roofing Ventilation Calculator based on? The Roofing Ventilation Calculator bases its results on the NFA 1/300 rule, a standard for determining proper balanced attic ventilation. ### How accurate is the Roofing Ventilation Calculator? The app provides calculations based on established industry rules. User ratings indicate an average of 3.4 stars from 5 ratings, suggesting mixed but generally functional performance. ### Is the Roofing Ventilation Calculator free to use? Yes, the Roofing Ventilation Calculator is available for free. There are no in-app purchases or subscription fees required to use its features. ### What devices support the Roofing Ventilation Calculator? The Roofing Ventilation Calculator is supported on iPhone, iPad, and iPod devices. ### How often is the Roofing Ventilation Calculator updated? The latest version is 2.1.19, and the app was last updated on September 5, 2025. This indicates recent development and maintenance. ### What is the age rating for the Roofing Ventilation Calculator? The Roofing Ventilation Calculator has an age rating of 4+, making it suitable for a wide range of users. ### Does the Roofing Ventilation Calculator have ads? No, the Roofing Ventilation Calculator does not contain advertisements. It is a completely ad-free experience. ### Who developed the Roofing Ventilation Calculator? The Roofing Ventilation Calculator was developed by Saint-Gobain, a well-known company in the building materials industry. ## Version history (last 5 releases) ### 2.1.20 — 2026-06-03 Bug Fix ### 2.1.19 — 2025-09-05 App update ### 2.1.17 — 2024-08-01 Bug fixes ### 2.1.15 — 2024-07-10 Bug fix ### 2.1.14 — 2024-04-02 Bug fix ## Apps similar to Roofing Ventilation Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Record Phone Calls: EZTape](https://appshunter.io/ios/app/record-phone-calls-eztape/id1512476140) | 4.3 (319) | Free | Business | | [外卖邦](https://appshunter.io/ios/app/id1516223800) | — | Free | Business | | [Spectrum Spatial Connect](https://appshunter.io/ios/app/spectrum-spatial-connect/id1516839580) | — | Free | Business | | [EagleView Drone](https://appshunter.io/ios/app/eagleview-drone/id1490288599) | 4.9 (9) | Free | Business | | [Scope Technologies](https://appshunter.io/ios/app/scope-technologies/id1608618967) | 4.3 (12) | Free | Business | | [Contractors Cloud](https://appshunter.io/ios/app/contractors-cloud/id6467678873) | 5.0 (3) | Free | Business | ## More apps by Compagnie de Saint-Gobain - [Cálculo del Factor de Forma](https://appshunter.io/ios/app/calculo-del-factor-de-forma/id493882662) - [NORTON iGRIND](https://appshunter.io/ios/app/norton-igrind/id550147080) - [Glass dBstation](https://appshunter.io/ios/app/glass-dbstation/id570784006) - [Soluciones de Aislamiento ISOVER](https://appshunter.io/ios/app/soluciones-de-aislamiento-isover/id786331079) - [Saint-Gobain SHAREHOLDER](https://appshunter.io/ios/app/saint-gobain-shareholder/id884182089) - [BD](https://appshunter.io/ios/app/bd/id890889320) All apps by Compagnie de Saint-Gobain: https://appshunter.io/developer/543924473 ## Related topics [roofing ventilation calculator](https://appshunter.io/ios/topics/roofing-ventilation-calculator) · [ventilation](https://appshunter.io/ios/topics/ventilation) · [certainteed](https://appshunter.io/ios/topics/certainteed) · [roof ventilator](https://appshunter.io/ios/topics/roof-ventilator) · [gaf vent](https://appshunter.io/ios/topics/gaf-vent) · [fresh ventilation](https://appshunter.io/ios/topics/fresh-ventilation) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-19.*