Rmax
High R-Value Wall and Roof Insulation Board
13524 Welch Road
Dallas, Texas 75244-5291
Toll Free: 800-527-0890
Phone: 972-387-4500
Fax: 972-387-4673
Email: rmax@rmaxinc.com
Web: www.rmaxinc.com
Rmax Multi-Vent Nailable Base-3 produces maximum air movement between the polyiso foam and the nailing surface allowing for 92% air movement. Effective on roofs that have hips or valleys where complete ventilation is difficult without a system that lets the air move in multiple directions. Ensures ventilation in all areas of the roof to comply with shingle manufacturer requirements
Rmax Multi-Vent Nailable Base-3 features multiple wood blocks that allow airflow in all directions. The standard product has 3/4" thick wood blocks and a 7/16" OSB nailing surface. Also available with other thicknesses of OSB, common plywoods, or 1.0" vented air space.
Call 1-800-527-0890 or email rmax@rmaxinc.com for samples.
Product Description
Multi-Vent Nailable Base-3 roofing insulation is composed of an HCFC-free polyisocyanurate foam insulation and an OSB nailing surface with 3/4" thick vent blocks attached. The insulation portion of this product is Rmax's rigid closed cell polyisocyanurate foam with glass fiber/organic mat facers laminated to the top and bottom surfaces. The nailing surface is a 7/16" OSB wood panel (APA Rated) with factory-applied vent blocks. The solid wood vent blocks are aligned so that they are no more than 12" apart in any direction. The vent block pattern allows 92% free air movement. Also available with 5/8" OSB or 1" vented air space.
The insulation is laid on the roof deck with staggered joints leaving a 1/16" space between boards to allow for expansion of the OSB.
Follow recommendations of the shingle supplier for application of underlayment felts and other details as required for roof pitches of less than 3" in 12" per foot slope. Rmax recommends that a layer of roofing felt be installed over the wood roof decks prior to installing Multi-Vent Nailable Base-3 roofing insulation.
Applications
Rmax's Multi-Vent Nailable Base-3 Polyiso Roofing Insulation is superior for use in residential or commercial roofing applications where a vented assembly is desired. Multi-Vent Nailable Base-3 roofing insulation is applied to the roof structure in order to provide a layer of thermal insulation and a suitable substrate for the application of a variety of shingles. Refer to specs sheet for specifications on securing Multi-Vent Nailable Base-3 Polyiso Roofing Insulation to roof structure.
Compliances
Product Specification – ASTM 1289 Type V
Nailing substrate APA rated
International Building Code (ICC)
Standard Sizes and Packaging
Width: 48"
Length: 96"
Nominal Thickness* |
LTTR Thermal R-Value
Foam Only |
2.2" |
6.0 |
2.7" |
9.0 |
3.2" |
12.1 |
3.7" |
15.3 |
4.2" |
18.5 |
4.7" |
21.7 |
5.2" |
25.0 |
*Includes 7/16" OSB and 3/4" air space
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