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Unirac Stronghold SHBUTYLM2 Butyl Attachment Kit Including Rail Clamp Mill

Unirac Stronghold SHBUTYLM2 Butyl Attachment Kit Including Rail Clamp Mill

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UniRac NXT STRONGHOLD Butyl Attachment Kit — Mill Finish

MPN SHBUTYLM2 | Complete Kit: (1) Butyl Base with Pre-Applied Butyl Patch + (2) #14 Screws with Sealing Washers + (1) NXT Rail Clamp | Mill Finish Aluminum | Rafter & Deck Mount | Florida NOA Approved

Flashless
No Metal Flashing Required
Peel & Place
One-Step Butyl Install
Dual Mount
Rafter or Direct-to-Deck
NOA Listed
Florida HVHZ Approved

Product Overview

The UniRac NXT STRONGHOLD Butyl Attachment Kit (MPN: SHBUTYLM2) is a complete, single-unit roof attachment kit for UniRac's NXT UMOUNT flush-mount solar racking system — delivering a fully flashless, sealant-free roof penetration solution that installs in a single step with no pre-drilling, no separate metal flashing, and no roofing sealant required. Each kit contains everything needed for one complete attachment point: one (1) mill-finish aluminum butyl base with factory-applied butyl patch pre-installed on the underside, two (2) #14 screws with sealing washers for rafter installation, and one (1) NXT rail clamp for direct rail connection. The pre-applied polybutylene (butyl) pad — a material trusted in the roofing industry for over 50 years — conforms to the roof surface and screw shanks under compression to form a self-sealing, watertight bond without any additional sealant or flashing components. The STRONGHOLD Butyl supports both rafter-mount (2 screws) and direct-to-deck installation (6 screws, 4 additional sold separately), integrates with UniRac's open-channel NXT UMOUNT rail system via the included rail clamp, and carries Florida Building Code approval for the High Velocity Hurricane Zone (HVHZ), NOA No. 24-0129.06 — the most demanding wind-uplift code standard in the U.S. residential solar market.

What's in the Kit

🔩
(1) Butyl Attachment Base
Mill finish aluminum L-foot base with factory-applied butyl pad pre-installed on underside. Peel liner, press to roof, fasten.
🔧
(2) #14 Screws + Sealing Washers
For rafter installation. Neoprene sealing washers compress against the attachment foot to seal each screw penetration. For deck mount, 4 additional screws required (sold separately).
🔗
(1) NXT Rail Clamp
Connects the butyl base directly to the NXT UMOUNT open-channel rail — enabling wire management through the rail channel and completing the attachment-to-rail assembly.

Key Benefits

Flashless Installation — No Flashing, No Sealant, No Pre-Drilling: Traditional lag-bolt roof attachments require lifting or cutting shingles, positioning a metal flashing plate underneath, driving a lag bolt through the flashing into the rafter, and applying roofing sealant around the penetration — a multi-step process that introduces multiple opportunities for misalignment, incomplete sealing, and future leak paths. The STRONGHOLD Butyl eliminates every one of these steps: the pre-applied butyl pad seals the roof surface contact area before the screws are driven, and the sealing washers on the #14 screws seal each individual penetration as the screw is tightened — requiring no lifting of shingles, no flashing plate positioning, no sealant application, and no waiting for sealant to cure.

Polybutylene Butyl Pad — 50+ Years of Proven Roofing Reliability: The factory-applied butyl pad uses polybutylene (butyl) rubber — the same material used in roofing underlayments, EPDM membrane seam tape, and flashing butyl for over five decades. Butyl's key property for roof applications is its viscoelastic flow behavior: under compression it conforms to irregular surface textures, shingle granules, screw threads, and minor surface imperfections — filling every void in the contact area and creating a self-sealing bond that performs better over time as the material continues to flow and conform under the weight of the attachment. Unlike silicone or urethane sealants that cure rigid and can crack at the sealant-to-substrate bond line, butyl remains permanently flexible and self-healing throughout the roof system's service life.

Rafter Mount or Direct-to-Deck — Built-In Miss Recovery: For rafter installation, two of the six available screw holes are used — positioned to hit the rafter centerline. If the rafter is missed on the first two holes, the installer simply shifts to the next pair of holes and tries again; if the rafter is missed again, all six holes are used for a direct-to-deck attachment that is structurally rated and fully sealed without any exposed unfilled holes requiring remediation. This built-in miss-recovery workflow means no exposed penetrations ever need to be patched or sealed after the fact — eliminating the most common source of installer rework and latent leak callbacks on rafter-mount attachment systems.

Florida HVHZ Approved — NOA No. 24-0129.06: The STRONGHOLD Butyl carries a Notice of Acceptance (NOA) for the Florida Building Code's High Velocity Hurricane Zone — the most stringent wind uplift code standard applied to residential solar installations in the United States, covering Miami-Dade and Broward Counties where sustained hurricane-force winds regularly exceed 150+ mph design wind speeds. NOA approval requires independent testing laboratory validation of the complete attachment system's wind uplift resistance under FBC testing protocols — making the SHBUTYLM2 one of the very few flashless solar attachments approved for use in the most demanding U.S. wind climate zone.

Integrated NXT Rail Clamp — Complete Kit, One SKU Per Attachment Point: By including the NXT rail clamp in every kit, UniRac ensures that one SHBUTYLM2 unit represents one complete attachment point — eliminating the need to track and order the rail clamp as a separate line item, reduces the risk of under-ordering clamps relative to bases, and ensures the rail clamp used at every attachment point is the correct UL 2703 listed clamp for the NXT UMOUNT system's integrated grounding path. The open-slot NXT rail clamp design also enables wire management routing through the NXT UMOUNT rail channel at every attachment point without additional wire clips.

How It Works — Installation Steps

The STRONGHOLD Butyl installs in three steps — no pre-drilling, no flashing, no sealant application required.

Step 1
Peel & Position
Locate the rafter using a stud finder or knock test. Peel the protective liner from the butyl pad on the underside of the attachment base. Position the base flat on the shingle surface with the foot centered over the rafter — ensuring the base does not straddle a shingle gap or overlap. If a shingle edge is unavoidable, add a butyl patch beneath (sold separately) to bridge the gap and provide a flat bearing surface.
Step 2
Press & Fasten
Press the base firmly onto the roof surface to ensure full butyl pad contact. Drive the two included #14 screws with sealing washers through the rafter-alignment holes into the rafter until the sealing washer seats flat against the attachment foot — snug but not overtightened (overtightening can deform the neoprene washer). If the rafter is missed, shift to the next hole pair; if missed again, drive all six screws for a fully rated direct-to-deck installation (4 additional screws required).
Step 3
Attach Rail Clamp
Attach the included NXT rail clamp to the butyl base's upright L-foot. Slide the NXT UMOUNT rail into the clamp's open channel slot and tighten to secure. The open-channel rail design enables wire management routing through the rail at each attachment point without separate wire clips. The clamp-to-rail contact completes the UL 2703 integrated bonding path from module to structure.

Note — Deck Mount Configuration: For direct-to-deck installation (e.g., when rafter location cannot be confirmed), four additional #14 screws are required beyond the two included in the kit. Additional screws and butyl patches are sold separately by UniRac. The deck-mount configuration is fully structural-rated and sealed — not a fallback method, but an equally valid primary installation approach for applicable roof structures per UniRac's NXT UMOUNT Design & Engineering Guide.

Technical Specifications

Manufacturer UniRac
MPN SHBUTYLM2
Product Type Flashless Butyl Roof Attachment Kit — NXT UMOUNT System
Kit Contents (1) Butyl Base with Pre-Applied Butyl Patch | (2) #14 Screws with Sealing Washers | (1) NXT Rail Clamp
Attachment Material Mill Finish Extruded Aluminum
Seal Material Polybutylene (Butyl) Rubber — Factory Pre-Applied
Finish Mill (Clear Anodized Aluminum)
Screw Size #14 with Neoprene Sealing Washer
Installation Method Rafter Mount (2 Screws Included) | Direct-to-Deck (6 Screws — 4 Additional Sold Separately)
Flashing Required No — Fully Flashless System
Sealant Required No — Butyl Pad & Sealing Washers Provide Complete Seal
Compatible Racking System UniRac NXT UMOUNT Flush-Mount Rail System
Compatible Roof Types Composition Asphalt Shingle | OSB Deck
Kit Weight 0.6 lbs
Kit Dimensions 16" × 5" × 5" (L × W × H)
Wind Code Approval Florida Building Code — High Velocity Hurricane Zone (HVHZ) | NOA No. 24-0129.06
Also Available In Black Finish — MPN SHBUTYLD2

Certifications & Compliance

Wind Uplift: Florida Building Code — High Velocity Hurricane Zone (HVHZ) Approved | NOA No. 24-0129.06
Grounding / Bonding: UL 2703 — Integrated Module Bonding & Grounding via NXT UMOUNT Rail Clamp
NEC Compliance: NEC 2020 §690.43 — Module Bonding | §690.47 — Grounding Electrode System
Building Codes: IBC | IRC — Via NXT UMOUNT Pre-Stamped Engineering Letters (Most U.S. States)
Seal Material: Polybutylene (Butyl) Rubber — 50+ Year Proven Roofing Industry Standard
Additional Accessories: Extra Butyl Patches and #14 Screws Available Separately from UniRac

Documentation

● Available | Contact us for lead time and pricing

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Customer Success Stories

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

Coll A

Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

Coll A

Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

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Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

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