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Description
Soprema DensDeck Prime Roof Board, 1/4 inch, 4 ft x 4 ftDensDeck Prime 1 4" Roof Board (4' x 4') Durable gypsum based roof substrate engineered for commercial roofing systems. Designed to resist fire, foot traffic, and hail while delivering superior dimensional stability and compressive strength for long service life. Key Features: Versatile Compatibility: Suitable for hot bitumen, cold applied (COLPLY), self adhesive, and heat weldable membranes Enhanced Durability: Superior compressive strength supports
DensDeck Prime 1/4" Roof Board (4' x 4')
Durable gypsum-based roof substrate engineered for commercial roofing systems. Designed to resist fire, foot traffic, and hail while delivering superior dimensional stability and compressive strength for long service life.
Key Features:
- Versatile Compatibility: Suitable for hot-bitumen, cold-applied (COLPLY), self-adhesive, and heat-weldable membranes
- Enhanced Durability: Superior compressive strength supports installation equipment and post-construction foot traffic
- Fire and Impact Resistance: Helps mitigate risks from fire and hail to extend roof lifespan
- Stable Performance: Low thermal and hygrometric expansion reduces movement; cover boards do not require gapping
- Commercial Grade: Trusted substrate for virtually any commercial roofing system
Specifications Table:
| Specification | Details |
|---|---|
| Product Name | DensDeck Prime |
| Brand | Soprema |
| Style | Roofing Insulation |
| Thickness | 1/4" |
| Dimensions | 4' x 4' |
| Unit of Measure | SQ | PC |
| Item Weight | 19.7 lb |
| Applicable Standards | ASTM C1177; Florida Building Code Approved; Miami-Dade County Approved; ASTM E84; ASTM C473 Method B; ASTM E661; ASTM E96; ASTM C518; ASTM C473; UL 790 Classified; UL 1256 Classified; FM Class 1 Approved |
| Product Number | SOP25DDP4 |
| Florida Product Approval Resource | https://www.floridabuilding.org/upload/PR_Tech_Docs/FL3915_R39_AE_2025_04_07_FINAL_NER-SOP-004.A.R3_FL3915-R39.pdf |
Frequently Asked Questions (FAQ):
Q: What types of roofing membranes are compatible?
A: Compatible with hot-bitumen bonded, COLPLY cold-adhesive bonded, self-adhesive, and heat-weldable membranes.
Q: Do the panels need to be gapped during installation?
A: No, DensDeck panels used as cover boards do not need to be gapped.
Q: What standards and approvals does it meet?
A: Meets ASTM C1177, E84, C473 (incl. Method B), E661, E96, C518; UL 790 and UL 1256 Classified; FM Class 1 Approved; Florida Building Code and Miami-Dade County Approved.
Q: What is the board size and thickness?
A: This variant is 4 ft x 4 ft with a 1/4 inch thickness.
Q: How heavy is each board?
A: Approximate item weight is 19.7 lb per piece.
A resilient foundation for refined rooftops
DensDeck Prime brings a sleek, purposeful layer to the roofscape—quiet strength with a cultivated edge. Its prime surface and steadfast core deliver stability underfoot and poise beneath high-performance membranes. Pair it with minimalist parapet detailing and a uniform membrane to create a crisp, architectural silhouette. For elevated projects, this board is the discreet essential that anchors luxurious durability.
Choose DensDeck Prime to fortify your roofing system with stable, code-approved performance that lasts.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.1 ★★★★★
Based on 687 reviews
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Product Reviews
★★★★★ 5
Great Product
Size: 6 Pairs / 12 pcs
These banana plugs have worked perfectly, no matter what gauge I have run in them, they work great. Easy assembly and great quality.
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Reviewed in the United States on May 8, 2026
★★★★★ 4
The most legit banana plugs I could find on Amazon
Size: 6 Pairs / 12 pcs, Size: 6 Pairs / 12 pcs
NEW PREFACE:: I am kind of glad I first bought the horribly magnetic, horribly made and GOLD PAINTED Sewell crimp on plugs (some reviewers say that Sewell are better and easier to use than the FosPower, which is true in design, but in quality of materials FosPower beats them hands down!!) ... Changing from those to these FosPower plugs plus the Monoprice 90° plugs, I am flabbergasted at the difference they make in sound quality. I have heard people say that they can hear the difference and even as an audiophile I was skeptical..... but my skepticism has been completely erased by what I am hearing with my own ears. I waited a few days to make sure I wasn’t just tripping before updating this review 🤣....but it has become clear to me how much a difference plugs made from the right materials actually make!!! I am 100% serious that the bass coming out of my Polk Signature Series tower speakers has at least doubled at the same volume. I can also now turn the volume up Way past my max volume before, without any distortion and much more clarity and less harsh highs. Everything just sounds warmer in general now which is amazing!!!! This is dangerous info for me... because now I’m thinking about making some really nice custom wires to see how much of a difference that makes 🙄🙄🤣 OK onto the review of the actual plugs here~~
These seem like decent connectors. I can’t tell if they are brass or copper, but they only have a slight hint of a magnetic property when testing them with a very powerful magnet. I was easily able to fit x2 - 14ga wires into it for bi-wiring purposes, including screwing on the collar. (As seen in my example pic) The gold plating on the tips seems legit and not painted like some of the plugs from Sewell... I have tested and tried quite a few plugs from Amazon and most seem to be crap. These however hold up better than most! These and the Monoprice 90° banana plugs with the black and red rubber sleeves. The latter are gold plated copper and have zero magnetic properties. (if you need 90° banana plugs)
UPDATE: still the best plugs I have found, but upon full install found two issues. One is a defect where a set of the plug threads for the barrel cover body weren’t cut right. The body’s do not tighten and stay loose because of that. Obvious issue for vibration with metal on metal...
The other issue is that even though these say they can fit different gauge wires, they seem to be geared more towards 12 or 10 gauge. I am using semi solid strand 14 gauge and find that unless I fold the wire over to make it double thick, the bolts use up all the thread and seem to become kind of loose inside the body. They won’t fully seat and keep spinning no matter how much you tighten. They seem to stay secure still but I just wonder about longevity over time with vibrations. So I just doubled up the wire and they seated fine! Not the worst issue in the world, but just kind of a pain since you have to strip the wire longer than you normally would so you can fold it over.
ANOTHER UPDATE: I had to remove these plugs from the wire to connect them to a crappy spring terminal amp while my better amp was in the shop. The issue I wrote about with the set screws "bottoming out" on smaller gauge wire became a more pronounced issue! I could not unscrew the set screws anymore and just had to cut the wires... So that means I will need to purchase more of these to replace the ones I cannot get wire back into. Not the best design, but still one of the best plugs I have found on Amazon.
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Reviewed in the United States on March 26, 2021
★★★★★ 5
Sturdy. Tight fit. No wobble
Size: 2 Pairs / 4 pcs
These are the best ones I’ve found. This order will connect one wire. Luckily that’s what I needed. If you’re doing more than one wire…
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Superior Design!
Size: 6 Pairs / 12 pcs
Delivery was lightning fast.
I tried a pack of two pairs of these banana jacks as a sample to see if these would meet my needs. The design of these plugs is superior. The design was exactly what I wanted because the speaker wire is secured with TWO set screws. Then I ordered an additional six pairs of plugs to hook up my subwoofer to my amp and speakers.
(I feed the audio output from the amp to the sub. The sub has a crossover that keeps the low frequencies and sends the mid and treble frequencies to my bookshelf speakers.)
I love the security of two set screws on each plug and love the barrel that screws on AFTER the wire is secured by the set screws. Most banana plugs have a hole through the shaft of the plug that receives the stripped wire. Then the barrel cover is screwed down to secure the wire in the plug. This design compresses the speaker wire but eventually the cap loses it grip and allows the connection between the wire and the plug to become loose. Then the transfer of the audio signal becomes poor and the speakers sound bad. Every month or two I needed to check all the banana plugs and re-tighten many of them for the best performance. The two set screws eliminate this problem. The set screws are quite small and take a little extra care in installation. You will need a small flat blade screwdriver to tighten them. I used the 1/8" flat blade driver from a set of jewelers screwdrivers.
These well made plugs are a bit pricier that many of the banana plugs available but certainly not the priciest plugs available. For me, the slightly higher price was more than offset by the security of the wire within the plug.
I'm not thrilled with the extra tight fit of the tip on the plugs into the jacks. It took a lot of effort to insert the in the jack. Actually I "greased" the pins (very sparingly) with with non-corrosion, conductive paste (Ox-Gard, No-Corrode, etc. Do NOT use any other grease.) Next time I'll use pliers to compress the pin.
My only quibbles are that the spring pins that go into the jack are very tight and that the plugs are only sold in quantities of two pairs or 12 pairs.
I recommend these banana plugs for all who are using the banana plugs and jacks for hooking up your speakers. It's a very convenient way of connecting speakers if your speakers and amplifier have the banana jack as part of the binding post. Further, it's much safer to use banana plugs since the possibility of shorting your amplifier with a stray strand of wire is practically zero. Easy Five Stars.
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Reviewed in the United States on April 13, 2018
★★★★★ 5
Top banana
Size: 5 Pairs / 10 pcs
Theses banana plugs are hight quality non magnetic. Banana plugs easy to usexand very high quality sound different because of the better connection and quality.
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Reviewed in the United States on May 24, 2026
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