The Ultimate All-in-One Solution for Fire & Acoustic Rated Intertenancy Wall Systems
For over 25 years, KOROK has been a trusted provider of high-performance fire and acoustic walls for the multi-level construction market. Now, with the introduction of the KOROK KIR high-performance intertenancy apartment wall systems, KOROK offers comprehensive solutions for seamless floor plate transitions.
Our systems integrate lift cores, riser ducts, stair cores, hallways, and apartments into one streamlined package. Experience unparalleled fire, seismic, acoustic, and safety protection with KOROK – your all-in-one solution for modern construction needs.
Simplify with KOROK: Combining Performance and Safety
Experience the perfect blend of simplicity and performance with KOROK. Our range of IT wall solutions incorporates fire protection, seismic deflection, passive safety, and acoustic efficiency, all while eliminating complex build-ups. KOROK delivers unmatched performance, safety, and simplicity for your construction needs.
Scissor Stairs – Fire and Acoustic Rated Protection
KOROK® has 2-way fire-rated wall systems for fire separation of Scissor Stairs or any Stairs.
Our innovative KOROK® Scissor Stair wall systems are BRANZ-tested and Warringtonfire-assessed, ensuring compliance with New Zealand’s fire safety standards. These systems are rated up to a Fire Resistance Rating (FRR) of -/120/120, offering robust protection for critical building areas.
Key Benefits of KOROK® Scissor Stairs Fire-Rated Wall Systems:
Two-way fire protection: Rated up to FRR -/120/120 for comprehensive fire separation.
No height limitations: KOROK® walls can be installed without restrictions on wall height, in both horizontal and vertical configurations.
Structural simplicity: No additional structural support required beyond attachment to stair landings and stair stringers.
Fast, efficient installation: Lightweight interlocking panels make installation faster and more cost-effective compared to conventional systems.
KOROK® Scissor Stairs wall systems combine fire safety, acoustic performance, and cost efficiency, making them the ideal choice for builders and developers.
KOROK® Scissor Stairs Systems cater to most common scenarios requiring fire resistance in stair configurations. These walls are constructed using 78mm thick, horizontally and/or vertically oriented KOROK® panels, designed to fit seamlessly between two independent stair stringers in scissor stairs configurations.
The systems feature self-supporting, non-load-bearing walls that can be built using horizontally or vertically stacked panels, or a combination of both. This flexibility ensures adaptability to a wide range of building designs.
Compliance with the New Zealand Building Code
KOROK® Scissor Stair Systems meet the stringent requirements of Clause C of the New Zealand Building Code (NZBC). They comply with the normative requirements for fire resistance performance as outlined in New Zealand’s acceptable solutions.
Fire Resistance Ratings (FRR)
The fire resistance ratings of KOROK® Scissor Stair Systems reach up to FRR -/120/120, depending on the span of the panels and the components selected.
Horizontal Fire Resistance: Achieved by the quadrilateral fire-resistant section between the two independent stairs.
Vertical Fire Resistance: Provided by the wall-to-stair stringer angle at the boundary connections.
For detailed configurations, refer to the technical specifications in the KOROK® Scissor Stair Systems wall type tables.
When it comes to passive fire penetrations, KOROK® leads the way with innovative solutions that ensure fire safety without compromising functionality.
At KOROK®, we are committed to providing fire-rated wall systems that prioritize safety, durability, and performance. Our advanced KOROK® panels are specifically designed to allow seamless integration of passive fire penetrations, including service ducting and pipes, while maintaining the structural and fire integrity of the wall.
Passive fire penetrations are openings or pathways in fire-rated walls or floors that allow services such as plumbing, electrical cables, or ductwork to pass through. These penetrations are essential for building functionality but must be carefully designed to prevent the spread of fire and smoke. KOROK® panels are engineered to make the creation and sealing of these penetrations straightforward and effective, ensuring compliance with strict fire safety standards.
Why Choose KOROK® for Passive Fire Penetrations?
Easy Formations for Penetrations: KOROK® panels simplify the creation of openings for ducting and plumbing. The lightweight yet robust design makes it easy to form precise and efficient penetrations without compromising fire safety or wall integrity.
Maintained Wall Integrity: Even with multiple passive fire penetrations, KOROK® panels ensure the overall wall system retains its fire rating. This is crucial for preventing fire and smoke from spreading across compartments in a building.
Versatile Applications: Whether your project involves commercial spaces, residential apartments, or industrial facilities, KOROK® passive fire penetrations provide a reliable and efficient solution tailored to meet your needs.
Compliance with Building Codes: KOROK® panels are rigorously tested and meet or exceed New Zealand’s building code requirements for passive fire protection. This gives architects, engineers, and builders confidence in the safety and performance of their projects.
The table below contains a basic selection of tested passive fire solutions, for quick reference. For additional solutions please contact the relevant passive fire companies:
CFS-C P 50/1.5" Fire Collar + CP606 Acrylic Sealant
-/120/60
Hilti
40mm ND uPVC Pipe. Refer to pages 28-30
40mm
uPVC
CFS-C P 50/1.5" Fire Collar + CP606 Acrylic Sealant + 13mm Plasterboard Patch
-/120/90
Hilti
50mm ND uPVC Pipe. Refer to pages 28-30
50mm
uPVC
CFS-C P 63/2.0" Fire Collar + CP606 Acrylic Sealant
-/120/90
Hilti
50mm ND uPVC Pipe. Refer to pages 28-30
50mm
uPVC
CFS-C P 63/2.0" Fire Collar + CP606 Acrylic Sealant + 13mm Plasterboard Patch
-/120/120
Hilti
65mm ND uPVC Pipe. Refer to pages 28-30
65mm
uPVC
CFS-C P 75/2.5" Fire Collar + CP606 Acrylic Sealant
-/120/90
Hilti
65mm ND uPVC Pipe. Refer to pages 28-30
65mm
uPVC
CFS-C P 75/2.5" Fire Collar + CP606 Acrylic Sealant + 13mm Plasterboard Patch
-/120/120
Hilti
80mm ND uPVC Pipe. Refer to pages 28-30
80mm
uPVC
CFS-C P 90/3" Fire Collar + CP606 Acrylic Sealant
-/120/90
Hilti
80mm ND uPVC Pipe. Refer to pages 28-30
80mm
uPVC
CFS-C P 90/3" Fire Collar + CP606 Acrylic Sealant + 13mm Plasterboard Patch
-/120/120
Hilti
Cable Bundle ≤ 36mm Dia. Any combination of Telecommunication cables, Cat5/6/7/8, Fiber Optic cables,RG6 Quad Shield Coax or TPS 2C+E up to 2.5mm2. Refer to pages 13-14
Max. 36mm
Cable
CP611a / CFS-IS Intumescent Sealant
-/120/60
Hilti
Cable Bundle ≤ 36mm Dia. Any combination of Telecommunication cables, Cat5/6/7/8, Fiber Optic cables,RG6 Quad Shield Coax or TPS 2C+E up to 2.5mm2. Refer to pages 13-14
Max. 36mm
Cable
CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
-/120/90
Hilti
Cable Tray up to 600mm Wide with 9 x 400mm2 XLPE/PVC or PVC/PVC Sheath/Insulated Single Core Copper or Aluminum Power Cables. Refer to pages 21-27
Cable
2 x Layers CP670 Coated Board + CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
-/60/60
Hilti
Cable Tray up to 600mm Wide with AS1530.4 Standard D1 XLPE/PVC or PVC/PVC Sheath/Insulated Power Cables Cable Sets. Refer to pages 21-27
Cable
2 x Layers CP670 Coated Board + CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
-/120/90
Hilti
Cable Tray up to 600mm Wide with AS1530.4 Standard D2 Telecommunication Cable Sets. Refer to pages 21-27
Cable
2 x Layers CP670 Coated Board + CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
-/90/60
Hilti
Up to 10 of Quad Shield Coax Cables. Refer to pages 13-14
Cable
CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
-/120/90
Hilti
Up to 16 of Telecommunication cables, Cat5/6/7/8 & Fiber Optic cables. Refer to pages 13-14
Cable
CP611a / CFS-IS Intumescent Sealant
-/120/90
Hilti
Up to 16 of Telecommunication cables, Cat5/6/7/8 & Fiber Optic cables. Refer to pages 13-14
Cable
CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
-/120/120
Hilti
Up to 8 of TPS 2C+E up to 2.5mm2. Refer to pages 13-14
CP611a / CFS-IS Intumescent Sealant
-/120/60
Hilti
Up to 8 of TPS 2C+E up to 2.5mm2. Refer to pages 13-14
CP611a / CFS-IS Intumescent Sealant + CFS-P BA Putty Bandage
The Pacifica – Elevating Auckland’s Skyline with KOROK
Standing at 178 meters and reshaping the Auckland skyline, The Pacifica is New Zealand’s tallest residential tower. This iconic 57-story structure, designed by Plus Architecture and developed by Hengyi, was brought to life by one of New Zealand’s largest construction firms, Icon. With 273 luxurious apartments ranging from one-bedroom units to super-penthouses, The Pacifica is not just a solution to Auckland’s residential housing shortage but also a cornerstone for the rapid gentrification of its district.
The Pacifica – Elevating Auckland’s Skyline with KOROK
Standing at 178 meters and reshaping the Auckland skyline, The Pacifica is New Zealand’s tallest residential tower. This iconic 57-story structure, designed by Plus Architecture and developed by Hengyi, was brought to life by one of New Zealand’s largest construction firms, Icon. With 273 luxurious apartments ranging from one-bedroom units to super-penthouses, The Pacifica is not just a solution to Auckland’s residential housing shortage but also a cornerstone for the rapid gentrification of its district.
The Pacifica – Elevating Auckland’s Skyline with KOROK
Standing at 178 meters and reshaping the Auckland skyline, The Pacifica is New Zealand’s tallest residential tower. This iconic 57-story structure, designed by Plus Architecture and developed by Hengyi, was brought to life by one of New Zealand’s largest construction firms, Icon. With 273 luxurious apartments ranging from one-bedroom units to super-penthouses, The Pacifica is not just a solution to Auckland’s residential housing shortage but also a cornerstone for the rapid gentrification of its district.
Architectural Vision
The Pacifica’s design, inspired by Auckland’s network of laneways and expansive blue skies, features a unique transition from a darker, intricate lower half to a lighter, open upper half. Plus Architecture’s creative lead, Ian Briggs, highlights the meticulous attention to detail, particularly in the glasswork that transitions from granular at the lower levels to more serene as it reaches the skyline. The building not only harmonizes with the street-level environment but also establishes a distinct presence in Auckland’s evolving cityscape.
KOROK’s Contribution
KOROK played a crucial role in ensuring The Pacifica’s safety and sound insulation by supplying all the fire and acoustic rated panels used in the lift shafts, risers, and ducts
Awards and Recognition
The Pacifica has garnered significant acclaim, including:
2023 Concrete NZ Awards – Nauhria Premier Concrete Award – Winner
2022 New Zealand Commercial Project Awards – Residential – Gold
2021 International Property Awards: Asia Pacific – Best Apartment/Condominium New Zealand Award – Winner
2021 Property Council New Zealand Rider Levett Bucknall Property Industry Awards – Multi-Unit Residential Property Award – Winner
Architectural Highlights
The Pacifica integrates luxury and functionality across its 273 apartments. Upper-level units feature winter gardens that provide a buffer between residents and the outside environment, echoing the sense of a traditional front garden. The interiors reflect contemporary New Zealand design with natural materials and darker timbers, creating a warm, sheltering atmosphere.
The Pacifica stands as a testament to modern residential architecture, combining luxury living with practical urban solutions. KOROK’s fire and acoustic rated panels played an essential role in this landmark project, reflecting our commitment to delivering high-performance building solutions. This project underscores our dedication to enhancing safety, efficiency, and comfort in luxury residential construction.
KOROK Systems used in this project
Lift Shafts, Risers, Ducts
For lift shafts and duct walls, KOROK® offers significant advantages over traditional construction. As panels can be installed from one side only, there is no requirement to construct scaffolding inside the shaft, greatly reducing construction time and costs.
BNZ Place: A Testament to Innovation and Sustainability
After nearly four years of design and construction, BNZ Place at 1 Whitmore Street in Wellington is officially open. This 12-storey, 17,000m² building, a collaborative effort between Studio Pacific Architecture and Jasmax, epitomizes practical and purposeful workplace design, combining sustainability, wellbeing, and functionality.
BNZ Place is one of the most seismically resilient buildings in New Zealand, featuring base isolation to protect against significant structural damage during earthquakes. Raised on a plinth to minimize flood risks and supported by piles extending 60 meters below ground, the building exceeds seismic strength requirements with an NBS rating above 180%.
Innovative Features and Sustainability
Targeting a 5 Green Star As-Built rating, BNZ Place incorporates high-performance solar control glass, energy-efficient systems, and a structural steel diagrid. Efficient floorplates, a double-height entry lobby, inter-floor stairs, and a rooftop courtyard contribute to its state-of-the-art design.
KOROK’s Contribution
KOROK played a crucial role in the construction of BNZ Place by supplying fire and acoustic walls for lift shafts, risers, and ducts. KOROK panels offer significant advantages over traditional construction, as they can be installed from one side only, eliminating the need for scaffolding inside shafts and reducing construction time and costs. Additionally, KOROK panels can be installed before the structure is watertight, preventing water ingress through open shafts.
A Collaborative Effort
The project involved collaboration with various stakeholders, including Newcrest LP, the developer behind the building. CEO Dan Huggins emphasized BNZ’s commitment to Wellington and its future. “BNZ Place reflects our commitment to the city and our vision for the future. We are thrilled to share this vibrant and innovative space with our customers, colleagues, and the people of Wellington,” he said.
BNZ Place at 1 Whitmore Street symbolizes resilience, innovation, and sustainability. With its doors now open, it stands as a testament to collaboration, forward-thinking design, and a commitment to a better future for Wellington.
KOROK Systems used in this project
Lift Shafts, Risers, Ducts
For lift shafts and duct walls, KOROK® offers significant advantages over traditional construction. As panels can be installed from one side only, there is no requirement to construct scaffolding inside the shaft, greatly reducing construction time and costs.
Situated directly across from the New Zealand Museum, Te Papa, Tākina is a modern facility spread across three floors. The upper levels offer extensive conference spaces accommodating up to 1600 delegates, while the ground floor is dedicated to international and domestic exhibitions. Built to a 5-Star Greenstar standard, Tākina exemplifies sustainable building practices in New Zealand. We commend LT McGuinness Ltd for their exceptional leadership and execution throughout the Tākina project. Their focus on quality, safety, and innovation ensured that Tākina achieved high standards in fire safety, acoustic control, and construction efficiency.
Situated directly across from the New Zealand Museum, Te Papa, Tākina is a modern facility spread across three floors. The upper levels offer extensive conference spaces accommodating up to 1600 delegates, while the ground floor is dedicated to international and domestic exhibitions. Built to a 5-Star Greenstar standard, Tākina exemplifies sustainable building practices in New Zealand.
We commend LT McGuinness Ltd for their exceptional leadership and execution throughout the Tākina project. Their focus on quality, safety, and innovation ensured that Tākina achieved high standards in fire safety, acoustic control, and construction efficiency. Their collaborative approach and dedication to sustainable building practices have significantly benefited the project, and we are pleased to have been part of their team.
Project Highlights:
Earthquake Protection: Tākina’s structural resilience is ensured by 32 base isolators, allowing for movement up to 750mm in any direction.
Innovative Design: The building features an expansive curtain wall, curved entries, and large stud heights, which posed unique construction challenges that were successfully managed.
Health and Safety: Despite the complexities, the project saw no major accidents, highlighting the effectiveness of rigorous health and safety protocols.
Budget and Timeline: With a transparent tender model and precise planning, the project was completed within budget and on schedule, despite market fluctuations.
KOROK Contribution
Product Supplied: 78mm Panels Gen 2
Service Provided: Lift Shafts, Risers, Ducts Fire and Acoustic Rated Protection
KOROK is proud to have supplied our 78mm Panels Gen 2 for the Wellington Convention and Exhibition Centre. Our participation in this project enabled us to enhance the efficiency of both the design and construction phases.
Key Features and Benefits of KOROK Panels:
Single-Side Installation: Panels can be installed from one side only, eliminating the need for scaffolding inside the shaft, which reduces construction time and costs.
Early Installation: KOROK panels can be installed before the structure is fully watertight, helping to prevent water from entering the building through open shafts.
Cost and Time Efficiency: The innovative design of KOROK panels streamlines the construction process, resulting in faster program times and overall cost savings.
The Wellington Convention and Exhibition Centre showcases modern architectural design and the performance of KOROK products. By choosing KOROK, LT McGuinness Ltd ensured that Tākina met high standards of fire safety, acoustic control, and construction efficiency. We are pleased to have contributed to this significant project, enhancing Wellington’s skyline and setting a benchmark in sustainable construction. For more information on how KOROK can enhance your next project, please contact us.
KOROK Systems used in this project
Lift Shafts, Risers, Ducts
For lift shafts and duct walls, KOROK® offers significant advantages over traditional construction. As panels can be installed from one side only, there is no requirement to construct scaffolding inside the shaft, greatly reducing construction time and costs.
KOROK® was involved in the construction of a dual-branded hotel in Auckland’s Central Business Precinct. Located at the corner of Albert and Wyndham Streets, this project, led by Icon NZ, began in 2019 and was completed in December 2021. The VOCO-HIE development is a 38-story building, standing approximately 135 meters tall, making it one of New Zealand’s tallest structures. The building offers expansive views across Waitemata Harbour and Mount Eden, featuring a modern design.
A 4-story glazed podium with separate entries for both hotels.
Guest services such as an all-day restaurant, bar, fitness center, and retail spaces.
294 Holiday Inn Express rooms on the lower floors.
200 VOCO Hotel rooms on the upper floors.
The VOCO brand, chosen by global hotel operator IHG, emphasizes sustainability through initiatives like recycling plastic bottles for bedding and using honey from onsite bees. The Auckland VOCO hotel continues these practices, alongside the ‘Me Time’ concept focusing on premium beds, superior showers, user-friendly technology, and innovative lighting.
KOROK®’s Contribution
KOROK® provided high-performance fire and acoustic wall systems for the VOCO-HIE development. Key highlights include:
Fire Protection: KOROK® systems offer up to a 2-hour fire rating, ensuring strong fire safety.
Acoustic Performance: The systems exceed the minimum STC 55 rating for hotels, achieving an STC 63 rating, ideal for ensuring a quiet environment for guests.
Design and Installation: KOROK®’s interlocking panels simplified and sped up installation, reducing labor costs and construction time. The panels’ clip-together design allowed for easy installation by a small crew, with comprehensive installation guides and on-site training provided.
Space Efficiency: The small footprint of KOROK® panels maximized usable floor space, offering developers greater flexibility in building design and planning.
Environmental Commitment
KOROK® panels were manufactured in New Zealand from locally sourced materials and were custom-made to minimize waste. They are fully recyclable and reusable, aligning with the sustainable ethos of the VOCO brand.
Collaboration and Innovation
KOROK® and Icon NZ collaborated closely to devise solutions for lift shafts and staircases, reflecting a commitment to quality and innovation in construction.
KOROK® was proud to contribute to the VOCO-HIE dual-branded hotel project, providing high-performance fire and acoustic wall systems that supported the building’s design and sustainability goals. This project showcased KOROK®’s dedication to quality and innovative building solutions.
KOROK Systems used in this project
Intertenancy Apartment Systems
At KOROK® we have developed a new series of KIR KOROK® Intertenancy Residential Walls that remove the need for linings in the ceiling plenum whilst maintaining fire resistance and acoustic control performance.
Wellington Airport welcomed a new state-of-the-art air traffic control tower in August 2018, designed to handle the airport’s demanding operations with over 97,000 flights annually. Standing 32 metres tall, the tower provides panoramic views across the airfield, ensuring air traffic controllers have optimal visibility to manage air traffic safely and efficiently.
This iconic structure is one of New Zealand’s safest buildings, meeting 100% of the building code for its importance level. The tower’s base includes 13 advanced base isolators to deliver superior earthquake resilience, a critical feature in Wellington’s seismic environment.
KOROK® was proud to contribute to this project, supplying 78mm fire-rated acoustic panels for the lift shafts, risers, and ducts. Our systems are specifically designed to streamline construction and improve safety on site. By allowing installation from just one side, scaffolding inside the shaft is not required, reducing both construction time and costs.
Our panels offer superior fire resistance, acoustic performance, and seismic resilience, making them the ideal solution for high-importance structures like the Wellington Airport control tower.
Why KOROK®?
Efficient Installation: No need for internal scaffolding, speeding up project timelines.
Superior Fire Protection: KOROK® systems ensure compliance with fire safety regulations.
Acoustic Performance: Helps to minimize noise pollution in critical areas like lift shafts and risers.
Seismic Resilience: Engineered for enhanced stability in earthquake-prone zones.
The Wellington Airport control tower is a landmark project, showcasing KOROK®’s capabilities in delivering advanced, resilient building systems for critical infrastructure.
KOROK Systems used in this project
Lift Shafts, Risers, Ducts
For lift shafts and duct walls, KOROK® offers significant advantages over traditional construction. As panels can be installed from one side only, there is no requirement to construct scaffolding inside the shaft, greatly reducing construction time and costs.
KOROK Fire and Acoustic Wall Systems at Tūranga Library, Christchurch
KOROK proudly contributed to the Tūranga Library project in Christchurch, New Zealand, which opened its doors in October 2018. As a replacement for the Christchurch Central Library, which was damaged during the 2011 Christchurch earthquake, Tūranga stands as a modern architectural masterpiece. Designed by New Zealand firm Architectus in collaboration with the award-winning Danish firm Schmidt Hammer Lassen, the library’s striking design reflects the golden hues of Christchurch’s Port Hills. KOROK’s fire wall and acoustic wall systems were installed in the building’s lift shafts, risers, and ducts, providing superior fire protection and sound insulation to support the library’s functional and safety needs.
For lift shafts and duct walls, KOROK® offers significant advantages over traditional construction. As panels can be installed from one side only, there is no requirement to construct scaffolding inside the shaft, greatly reducing construction time and costs.
Lift Shafts, Risers, Ducts – Fire and Acoustic Rated Protection
KOROK® fire and acoustic rated wall systems offer superior solutions for lift shafts, risers, and ducts. With our innovative panel design, you can install from one side only, eliminating the need for internal scaffolding and significantly reducing construction time and costs.
Key Advantages:
Single-side installation: No scaffolding required inside the shaft, speeding up the construction process.
Pre-weather installation: KOROK® panels can be installed before the building is watertight, protecting against water ingress through open shafts and risers.
For more information or technical support on KOROK® fire and acoustic solutions for lift shafts, risers, and ducts, contact us today. We’re here to assist with any questions or specific project requirements.
The internal side lined with 1 layer 19mm GIB Fyreline® or acceptable GIB® alternatives or 2 layers 10mm GIB Fyreline® or acceptable GIB® alternatives.
Longrun profiled steel cladding system as selected.
The internal side lined with 1 layer 19mm GIB Fyreline® or acceptable GIB® alternatives or 2 layers 10mm GIB Fyreline® or acceptable GIB® alternatives. Longrun profiled steel cladding system as selected
1 layer 10mm GIB® Standard plasterboard or equivalent each side
Acoustic insulation must be either Autex GreenStuf SW90 or Pink Batts R 2.2 each side.
KOROK® metal fire flashing is installed to the top C-track.
KOROK® metal KIT flashing is installed to horizontal joints.
90mm steel or timber frame each side
86mm overall. Framing not to touch KOROK® panel or fire flashing
KOROK® metal fire flashing is installed to the top C-track. KOROK® metal KIT flashing is installed to horizontal joints.
1 layer 10mm GIB® Standard plasterboard or equivalent each side
Acoustic insulation must be either Autex GreenStuf SW90 or Pink Batts R 2.2 each side.
KOROK® metal fire flashing is installed to the top C-track.
KOROK® metal KIT flashing is installed to horizontal joints.
90mm steel or timber frame each side
80mm overall. Framing not to touch KOROK® panel or fire flashing
KOROK® metal fire flashing is installed to the top C-track. KOROK® metal KIT flashing is installed to horizontal joints.
KOROK® metal fire flashing is installed to the top C-track
OR
13 mm GIB Fyreline® or acceptable GIB® alternatives x 120 mm strip with
sealant is fixed at 250 mm centres top and bottom, using 6g x 32 mm
drywall screws.
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