DensDeck® ProFast™ Prime Roof Board

Innovative lightweight design, approximately 20% lighter than 1/2″ DensDeck^®Prime Roof Board, for easier handling and installation.¹
Enhanced maneuverability reduces transport and installation challenges without sacrificing strength or durability.
Can help reduce fasteners by 25-75%.²
Specifically engineered for mechanically attached roofing assemblies.

Submittal Request a Sample

Product Details

DensDeck^® ProFast™ Prime Roof Board is an innovative, lightweight roofing solution designed to enhance performance, efficiency and cost savings in roofing applications. Approximately 20% lighter than the 1/2” DensDeck^®Prime Roof Board, it offers enhanced maneuverability, making it easier to transport, handle and install without compromising strength, durability or dimensional stability when installed in a properly designed roof assembly. Specifically engineered for mechanically attached roofing systems, as well as partially adhered assemblies, DensDeck^® ProFast™ Prime Roof Board offers exceptional resistance to fire, wind uplift, punctures and hail. By reducing the number of fasteners needed by change to 25-75%¹, it can significantly lowers material expenses and installation labor, contributing to optimized project timelines and budgets.

FEATURES AND BENEFITS

Lighter Board: Easier to handle, transport and install. Helps Reduce physical strain and could speed up installation processes.
Reduce Project Costs: Helps reduce material consumption and installation labor costs, helping to optimize project budgets and lower overall expenses.
Reduced Fasteners: Can reduce the number of fasteners by 25% to 75%³
Truck Load Optimization: Can fit up to 25% more on a truck².

Product Specifications

PERFORMANCE ATTRIBUTES

R Value⁷	ft2•°F•hr/BTU (m2•K/W): 0.33
ASTM Type	ASTM C1177
Surfacing	Fiberglass mat with non-asphaltic coating
Mold Resistance¹⁰	10 (highest possible)
Flexural Strength⁴ parallel, lbf. min. (N)	parallel, lbf. min. (N): ≥100 (444)
Flute Spanability⁵	5″ (127 mm)
Permeance⁶, Perms (ng/Pa•S•m2 )	>30 (>1710)
Linear Variation with Change in Temp., in/in/°F (mm/mm/°C)	8.5 x 10⁶ (15.3 x 10⁶)
Linear Variation with Change in Moisture	6.25 x 10⁶
Water Absorption⁸, % max	5
Compressive Strength, psi nominal	880
Surface Water Absorption, grams, nominal	1

PHYSICAL ATTRIBUTES

Thickness	nominal: 3/8″ (9.5 mm) ± 1/32″ (.8 mm)
Width	standard: 4′ (1219 mm) ± 1/8″ (3 mm)
Length	standard: 8″ (2438 mm) ± 1/4″ (6.4 mm)
Weight	nominal (lbs./sq. ft. (Kg/m2): 1.64 (8)

CERTIFICATIONS

^1.Based on FM testing with multiple roofing assemblies using #15 fasteners and 3” metal flat-bottom plates in April 2025.

^2. Compared to 1/2” DensDeck® Prime Roof Board.

^3. Compared to assemblies using 1/2” DensDeck® Prime Roof Board, specifically when the cover board is mechanically attached. The 25-75% reduction in fasteners is based on FM testing with multiple roofing assemblies.

^4. Tested in accordance with ASTM C473 method B.

^5. Tested in accordance with ASTM E661.

^6. Tested in accordance with ASTM E96 (dry cup method).

^7.Tested in accordance with ASTM C518 (heat flow meter).

^8. Specified values per ASTM C1177.

^9. Tested in accordance with ASTM C473.

^10. When tested, as manufactured, in accordance with ASTM D3273, DensDeck Roof Boards have scored a 10, the highest level of performance for mold resistance under the ASTM D3273 test method. The score of 10, in the ASTM D3273 test, indicates no mold growth in a 4-week controlled laboratory test. The mold resistance of any building product when used in actual job site conditions may not produce the same results as were achieved in the controlled, laboratory setting. No material can be considered mold proof. For additional information, go to www.buildgp.com/safetyinfo.

Certifications may vary by production location, please contact local representative for more information.