SKU: 51850998603

Atlas ACFoam-II 1 in. x 4 ft. x 4 ft. Grade-III (25 psi) Polyiso Roof Insulation Board

$461.90 $513.22
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Description

Atlas ACFoam-II 1 in. x 4 ft. x 4 ft. Grade-III (25 psi) Polyiso Roof Insulation Board1" Polyiso Roof Insulation Board, Grade III (25 psi) Closed cell polyisocyanurate roof insulation with fiber reinforced organic felt facers for durable thermal performance. This 1 inch, 4x4 board delivers long term thermal resistance (LTTR) and is designed for commercial and residential roofing systems. Key Features: Durable Construction: Closed cell polyiso core bonded to non asphaltic, fiber reinforced felt facers Grade III Compressive Strength: 25

1" Polyiso Roof Insulation Board, Grade-III (25 psi)

Closed-cell polyisocyanurate roof insulation with fiber-reinforced organic felt facers for durable thermal performance. This 1-inch, 4x4 board delivers long-term thermal resistance (LTTR) and is designed for commercial and residential roofing systems.

Key Features:

  • Durable Construction: Closed-cell polyiso core bonded to non-asphaltic, fiber-reinforced felt facers
  • Grade-III Compressive Strength: 25 psi rating for robust roof assemblies
  • Consistent Thermal Performance: Offers long-term thermal resistance (LTTR) across thickness options
  • Standard Board Size: 1 in. thickness, 4 ft. x 4 ft. dimensions for easy layout and handling
  • Industry Approvals: Meets ASTM C1289 and multiple UL, FM, IBC/NBC, Miami-Dade, and Florida standards

Specifications Table:

Specification Details
Thickness 1" (25.4 mm)
Length 4' (1220 mm)
Width 4' (1220 mm)
Material Closed-cell polyisocyanurate (polyiso) foam core
Facers Non-asphaltic, fiber-reinforced organic felt facers
Compressive Strength Grade-III, 25 psi
Certifications/Approvals ASTM C1289; CAN/ULC-S704; CCMC No. 12464-L; UL Certified for Canada; UL 1256; UL 790 (ASTM E108); UL 263 (ASTM E119); UL 1897; FM 4450/4470; IBC Chapter 26 & NBC; Miami-Dade County Approved; Florida Product Approved; UL Greenguard Gold Certified; RCI Approved; AIA Approved; USGBC Member; NRCA
Unit Area 768 sq. ft. per unit
Style Polyiso
Manufacturer Number AC2_25PSI_00
Product Number ATL1ISO4G3

Frequently Asked Questions (FAQ):

Q: Can this board be used over metal or concrete decks?
A: Yes, it is approved under multiple UL and FM standards for a variety of roof deck types; follow the specific assembly requirements in the product data sheet.

Q: What is the compressive strength rating?
A: Grade-III boards are rated at 25 psi.

Q: Does it contribute to indoor air quality certifications?
A: Yes, it is UL Greenguard Gold Certified.

Q: How is it fastened?
A: Use the manufacturer’s Fastening Pattern Guide for appropriate mechanical attachment or adhesive application per roof system design.

Q: What are the board dimensions?
A: 1 inch thick, 4 feet by 4 feet.

Sleek Thermal Armor for Modern Roofscapes

This streamlined insulation board brings quiet sophistication to the roofline while delivering steadfast thermal performance. Its fiber-reinforced facers create a refined, uniform surface that supports clean, contemporary assemblies. Pair with a high-contrast membrane and precision metal edging for a crisp architectural profile. A smart essential for luxurious, energy-conscious envelopes.

Upgrade your roof assembly with Atlas ACFoam-II Grade-III polyiso for dependable strength and long-term thermal efficiency.

Warranty

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 51850998603

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4.3 ★★★★★
Based on 29 reviews
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Product Reviews
G
Verified Purchase
grog
Belleville, US
★★★★★ 5
If pump doesn't seem to work
Size: For 85-300 HP, Size: For 85-300 HP
Hi....I apologize it took me a while to get back to you with my results. Here is what I discovered about the pump and will also apply to some of the other comments I read in the reviews with people not getting the pump to work: 1.) I removed the pump to check the proper direction of the impeller and it was correct as can be seen in the photo. 2.) I built a pump shaft attachement so that I could operate the pump with a power drill. 3.) I attached the water muff to the unit and tried to pump water.....it wouldn't do so. What I did see however was that even at high hose discharge and small leakage at the muff I could not fill the water cavity in the housing. 4.) I installed a strap around the muff and tightened it very tight and THEN at high hose pressure I was able to get the cavity to fill with water. 5.) At that point I activated the drill and was able to get the pump to actually pump water. I then removed the pump housing and removed the O-Ring that resides on top of the impeller, reassembled and it would not pump water. Since the O-Ring sits higher than the original does I wanted to make sure that it was necessary to have it in the pump. 6.) I reassembled the engine and kept the tight strap on the bottom and finally it pumped water into the engine. My conclusion that you can reply to other buyers if they have a problem: Do NOT underestimate 2 things....1.)the lack of ability of the pump to draw water up AND 2.)the fact that if the muff leaks it will NOT fill the cavity when common sense says it should. This was a 120hp Johnson. The engine bottom must be immersed fully or the muff must be very tight on the lower unit for the pump to function. Please feel free to post this if you wish.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 12, 2024
M
Verified Purchase
Monchita
Lexington, US
★★★★★ 5
Exelente
Size: For 85-300 HP
Exelente
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
D
Verified Purchase
Dave Murray
Draper, US
★★★★★ 5
Good as new
Size: Package Dimensions ‎6.02 x 4.02 x 2.05 inches
Fitment was great and works as it should. Good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2025
K
Verified Purchase
Kenny
Pawtucket, US
★★★★★ 3
Incorrect motor listed. Far smaller impeller than what's in the 6 horse johnson.
Size: For 5.5HP 6HP 7.5HP
It seems to be of good quality. However it does not fit a 6 horse johnson as it states. Therefore it will not pump water or function for my purposes. It was a waste of money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2025
S
Verified Purchase
Sylvia E.
Massapequa, US
★★★★★ 5
OE Quality Part
Worked perfectly. Everything needed is there.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026

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