HIGH-Rim, exclusive high R-value rimboard product of National Lumber Company of Mansfield, MA

National Lumber's new insulated rimboard product, HIGH-Rim, provides greater R-values than comparable products on the market, as well as time and cost savings.

HIGH-Rim Printable PDF

HIGH-Rim sample

R-11 Assembly

HIGH-Rim insulated rimboard consists of two OSB boards and polyurethane foam adhered to create a tightly sealed, high R-value barrier for the perimeter of the beltline.


• Pre-assembled 12 foot lengths

• 3-1/2″ thick

• In-stock depths: 9-½″, 11-7/8″, and 14″

Massachusetts Stretch Code Map


• R-11 assembly insulates a difficult area in floor construction in one step

• Meets APA PRR 401 for non-structural rimboard

• Helps your project meet Massachusetts Stretch Energy Code

MA Stretch Code Overview PDF

MA Stretch Code Map PDF

HIGH-Rim diagram cross section of structural materials

Cross Section Diagram

In our cross section diagram, you can see how the HIGH-Rim insulated rimboard sits on the pressure treated sill of the building.

HIGH-Rim can be purchased as part of our Rapid Frame® system, or separately.

This product is available exclusively from National Lumber. To learn more, speak to your salesman or call 1-800-370-WOOD. Ask about item numbers IR1012, IR1212 and IR1412.


Back to Top