--- title: Smith 1020 Roof Drain Specs & Options description: Find engineering specs and diagram for Smith's 1020 side outlet roof drains. --- Search our inventory of drains, drain parts, safety and roofing equipment, and accessories. [Shop Now](https://hy-techroof.com/products/). - [ About ](https://www.hy-techroof.com/about-hy-tech/) - [ Contact ](https://www.hy-techroof.com/contact-hy-tech/) - - [![Hy-Tech Roof Products](https://resources.hy-techroof.com/hubfs/Logos/Hy-Tech%20Logo_rgb_maroon_480.png) ](https://www.hy-techroof.com) [**](https://www.hy-techroof.com/login.php) [**](https://www.hy-techroof.com/cart.php) ** ** [![Hy-Tech Roof Products](https://resources.hy-techroof.com/hubfs/Logos/Hy-Tech%20Logo_rgb_maroon_480.png) ](https://www.hy-techroof.com) [**](https://www.hy-techroof.com/cart.php) - - # Smith 1020 Roof Drain Specs & Options *Dimensional data is subject to manufacturing tolerances and change without notice.* ### *[Download Specifications PDF](https://www.jrsmith.com/uploads/fileLibrary/d1010.pdf)* | **Outlet Size (A)** | **2 in.** | **3 in.** | **4 in.** | **5 in.** | **6 in.** | | --- | --- | --- | --- | --- | --- | | **B** | 6-7/8 | 6-3/8 | 5-7/8 | 5 | 4-1/2 | | **C** | 8-5/8 | 8-3/4 | 8-3/4 | 8-1/2 | 8-1/2 | | **G** | 4-3/4 | 4-3/4 | 4-3/4 | 6-1/4 | 6-1/4 | | **H** | 6 | 6 | 6 | 6-7/8 | 6-7/8 | | **J** | 7-3/4 | 7-3/4 | 7-3/4 | 7-3/4 | 7-3/4 | | **Free Area (sq. in.)** | 102.5 | 102.5 | 102.5 | 102.5 | 102.5 |   **Specifications: **The Smith 1020 roof drain is used in flat roof construction. Its large profile dome provides sufficient free area for quick rain water drainage while protecting the drain sump and connecting piping from debris. A wide clamping surface holds flashing and roofing materials without puncturing. This drain comes regularly furnished with a Duco cast iron body combined with a flashing clamp and gravel stop, and a polyethylene dome.  **Recommended Deck Openings** | **Outlet Size (in.)** | **With Sump** **Receiver (.in)** | **Without Sump** **Receiver (.in)** | | --- | --- | --- | | 2 - 6 in. | 17 dia. | 14 dia. |   *[![Find and Buy Smith Roof Drains](https://no-cache.hubspot.com/cta/default/10783/8114ace5-1719-482e-8b86-7f1517b618a7.png)](https://cta-redirect.hubspot.com/cta/redirect/10783/8114ace5-1719-482e-8b86-7f1517b618a7)* ## Outlet Types - Caulk Outlet - No-Hub Adaptor (Specify fig. 2646Y) - Threaded Outlet ## Variations - Extension (specify height) (-E) - "L" Shaped Underdeck Clamp (-CL) - Secondary Flashing Clamp (-C2) - Sump Receiver (-R) - Underdeck Clamp (-C) - Vandal Proof Dome (-U) ## Optional Materials - All Aluminum (-AA) - Aluminum Dome (-AD)* - Cast Iron Dome (-CID)* - Galvanized Cast Iron Dome (-CIDG)* - Galvanized Cast Iron Body & Collar (-G) - Rough Bronze Dome (-RBD)* - Stainless Steel (specify fig. 9780) ## *Optional Domes' Free Area | **Dome Material** | **2 - 6 ****Outlets** | | --- | --- | | Aluminum Dome  | 98 | | Cast Iron Dome  | 80 | | Bronze Dome | 95 |     - [Drains](https://www.hy-techroof.com/products/drains/) - [Zurn](https://www.hy-techroof.com/manufacturers/zurn/) - [Smith](https://www.hy-techroof.com/manufacturers/j-r-smith/) - [Josam](https://www.hy-techroof.com/manufacturers/josam/) - [Wade](https://www.hy-techroof.com/manufacturers/wade/) - [Marathon](https://www.hy-techroof.com/manufacturers/marathon/) - [Olympic](https://www.hy-techroof.com/manufacturers/olympic/) - [Equipment](https://www.hy-techroof.com/products/equipment) - [Garlock](https://www.hy-techroof.com/manufacturers/garlock/) - [Leister](https://www.hy-techroof.com/manufacturers/leister/) - [All Seasons / Grizzly](https://www.hy-techroof.com/manufacturers/all-seasons-equipment/) - [Hennes-Johnson](https://www.hy-techroof.com/manufacturers/hennes-johnson/) - [Gator](https://www.hy-techroof.com/manufacturers/gator-roofing-equipment/) - [Roofmaster](https://www.hy-techroof.com/manufacturers/roofmaster-products-company/) - [Safety](https://www.hy-techroof.com/products/safety) - [Leading Edge](https://www.hy-techroof.com/manufacturers/leading-edge-safety/) - [Tie Down Manufacturing Ingenuity](https://www.hy-techroof.com/manufacturers/tie-down-manufacturing-ingenuity/) - [Malta Dynamics](https://www.hy-techroof.com/manufacturers/malta-dynamics/) - [Resources](https://resources.hy-techroof.com) - [Account](https://www.hy-techroof.com/login.php) - [The Drain Wizard](https://resources.hy-techroof.com/ask-the-drain-wizard) - [FAQ](https://resources.hy-techroof.com/faq) - [Blog](https://resources.hy-techroof.com/blog) - [Roof Drain Specs](https://resources.hy-techroof.com/roof-drain-specs-and-diagrams) - [Video Library](https://resources.hy-techroof.com/video-library) - [About](https://www.hy-techroof.com/about-hy-tech/) - [Contact Us](https://www.hy-techroof.com/contact-hy-tech/) - [About Hy-Tech](https://www.hy-techroof.com/about-hy-tech/) - [Service and Repairs](https://www.hy-techroof.com/service-and-repairs/) [800-635-0384](tel:8006350384) **Hy-Tech Products **10035 Broadview Road, Broadview Heights, OH 44147 [info@hy-techroof.com](mailto:info@hy-techroof.com) [800-635-0384](tel:8006350384) **Hy-Tech Products **10035 Broadview Road, Broadview Heights, OH 44147 [info@hy-techroof.com](mailto:info@hy-techroof.com) © 2026 Hy-Tech Products, Inc. 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