FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing
- Saves energy and resists moisture with limited lifetime warranty
- Reduce gaps and eliminate drafts with film faced uniform surface
- Folded hinge at 24' intervals to ease application at job site
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Product Details
A Home is a Fortress
It keeps comfort and safety in - and the other stuff out. Help create the year-round protection every home deserves with proven solutions that work where and when you need them most.
Owens Corning FOAMULAR XPS
FOAMULAR is a rigid insulation board made of extruded polystyrene. XPS for short. Compared to EPS products, FOAMULAR XPS has 25% more insulating power and is 10 times more water resistant.
Choose Above- and Below-Grade Protection
FOAMULAR provides continuous insulating power around the entire home from the foundation to the roofline and all kinds of spaces in between.
Insulating Basement Walls
FOAMULAR is the easy-to-install insulating solution for basement walls. Get added comfort with PINK Fiberglas insulation and finish with drywall board.
Insulating Foundation Walls
FOAMULAR is ideal for insulating exterior foundation walls. Extremely durable, it can withstand up to 15-25 psi and resists common acid soils and decay.
Insulating Under Exterior Siding
FOAMULAR provides a higher R-value per inch than other materials commonly used for exterior wall sheathing.
Also Available in Fanfold
FOAMULAR Fanfold is generally intended for use as a backer board for residing applications and comes in 50-foot sections for a faster install.
Superior Moisture Resistance
Virtually impervious to moisture. FOAMULAR has up to 10X more resistance to water than EPS insulation.
Durable, Yet Flexible
A wide range of compressive strengths –up to 100 psi – to handle heavy loads.
Easy to Cut, Form and Fit
Easy to handle, score, cut and install; no special tools needed.
Outstanding Insulating Properties
High, stable R-value (5 per inch of product thickness) - more than wood fiber, plywood or 1/2” gypsum board.
Sustainable
Foamular is certified to meet indoor air quality standards under the stringent GREENGUARD Gold Certification Program.
Lifetime Guarantee
The only XPS with a limited lifetime warranty that guarantees a minimum 90% of R-value for the life of the product.
- Dimensions: 1/4 in. x 4 ft. x 50 ft.
- Insulation Application: backer board for under new or replacement siding
- Closed cell light weight foam board
- Thermal performance of R1
- Click here to shop Loctite foamboard adhesive
- FOAMULAR 150 and 250 are available in various thicknesses and R-values, the difference is the compressive strength, FOAMULAR 150 has a compressive strength of 15 psi and FOAMULAR 250 is 25 psi
- FOAMULAR is not rated for STC (sound transmission) and does not have any soundproofing properties. Owens Corning fiberglass batts and rolls are great options for acoustic applications.
- When using FOAMULAR or any low perm insulation, always verify the moisture vapor flow and dew point characteristics of the wall system, please check your local building codes for vapor retarder/barrier information
- Being used in an interior construction application, painting the FOAMULAR is not recommended as FOAMULAR cannot be left exposed and will need to be covered by a 15-minute thermal barrier such as drywall
- If being used for crafts, acrylic or latex based paints can be used with FOAMULAR products
- If you're looking to insulate your garage door, Owens Corning Garage Door Insulation Kit is an easy, fast and affordable way to keep your garage warm in winter and cool in the summer.
- If you're looking to ventilate your attic rafters, Owens Corning Raft-R-Mate is a XPS foam vent designed to assure unrestricted airflow from the soffit to the ridge vent.
- FOAMULAR is available in two edge configurations:
- Square edge - designed to fit flush next to adjoining boards
- Scored Square Edge - comes with 3 factory scores, so that you can take a 4' sheet, break it in two and have two, 2' wide sheets (middle score) or you can break it into three 16" wide pieces by snapping at the left and right score.
- Click here to shop Owens Corning Foam Board Insulation styles
- Click here to shop Loctite foamboard adhesive
- Click here to learn more about Eco Options and Energy Efficiency
- Click here to learn more about Insulation R-Values
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Compare Similar Foam Board Insulation
|  |  |  | |
| Brand | Owens Corning | Owens Corning | STYRO Industries | SilveRboard |
| Name | FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing | FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Unfaced Squared Edge Insulation Sheathing | 19 in. x 150 ft. Sticky Mesh Heavy Duty | 1 in. x 2 ft. x 48 in. R5 Radiant Acoustic Insulation Kit - STC 19 (12 sheets) - 96 sq. ft. |
| Price | $5698 | $6000 | $11112 | $13748 |
| Ratings | (134) | (17) | (62) | (287) |
| Product Thickness (in.) | 0.25 in | 2 in | 0.08 in | 1 in |
| Insulation R-Value | R1 | R10 | R5 | |
| Insulation Location | Re-Siding | Basement | Basement,Ceiling Insulation,Exterior Sheathing,Exterior Wall,Exterior Wall Foundation,Interior Ceiling,Interior Wall,Wood Siding | 2x4 Wall,2x6 Wall,2x8 Wall,Attic,Basement,Ceiling Insulation,Exterior Sheathing,Garage,Interior Wall,Metal Building,Re-Siding |
| Insulation Features | Formaldehyde Free | Formaldehyde Free | Mold Resistant | Formaldehyde Free,Vapor Retardant |
| Faced or Unfaced | Unfaced | Unfaced | Unfaced | Faced |
| Sheathing Type | XPS | XPS | EPS | EPS |
| Pack Size | 1 | 4 | 1 | 12 |
| View Product | View Product | View Product | View Product |
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