Description
Product Description
The new Buildera CRACKMON 4020A is a heavy-duty, patent-pending, building-foundation crack monitor to measure displacement in foundations, concrete, stucco, masonry, plaster, wood and steel structures. Ideal for restoration, seismic retrofitting, or forensic analysis of differential settlement, the CRACKMON 4020A is an indispensable tool for structural, civil and geotechnical engineers, building contractors, trades professionals, commercial property owners, building inspectors, or homeowners. Buildera precision manufactures each CRACKMON 4020A in the USA using premium-quality materials and workmanship for superior engineering accuracy and traceability.
Individual units sealed in a heavy-duty polybag. Includes installation instructions and crack progress chart. Mounting hardware or epoxy sold separately. Also available in bulk for resellers and volume end-users. Contact us for volume pricing.
Features and Benefits
- Unique serial IDs yield unprecedented engineering traceability in a crack monitor
- Extreme durability—50% thicker proprietary polymer compared to classic model (4.5 mm vs 3 mm)
- New 2D+ polar magnitude and X-Y displacement measurement grid with precision TickPoints™ improve measurement accuracy
- Vibrant rich-black and red printing on opaque white background doubles the contrast and legibility
- Integrated GeoQR™ technology for online instructions, ordering, and geolocation tagging*
- Flexible mounting arrangement optimized for #8(M4) or #6(M3.5) tamper-resistant fasteners and epoxy
- Available tamper-resistant Torx Plus® stainless-steel screws and anchors made in USA
- Optional impact-absorbing thermoplastic drilling guide aligns hole centers while hammer-drilling concrete
- Co-branding and custom mobile-response options and sizes available—consult Buildera for program details
Civil, Geotechnical & Structural Forensics
- Airports, bridges, dams, highways, hydroelectric plants
- Commercial and residential buildings, historic monuments
- Foundations, basements, seismic retrofits, preservation
- Industrial plants, petroleum rigs, ships
- Power grid, transmission towers, nuclear reactors
Applications
- Airports, bridges, dams, highways, power plants
- Basements, beams, foundations, retaining walls
- Commercial and residential structures, historic monuments
- Seismic retrofits
- Unreinforced masonry (URM/URB)
Engineering Specifications
MECHANICAL
- Dimensions: 30 mm x 152 mm x 9 mm (1.20″ x 6.00″ x 0.35″)
- Range: 40 mm x 20 mm (scale divided as ±20 mm x ±10 mm)
- Discrimination: ±0.5 mm, typ.
- Mounting Holes: (4) Per side
- Material: Proprietary polymer
- Tensile Strength: 11,000 psi (ASTM D-638)
- Flexural Strength: 117 MPa (17,000 psi), ASTM D-790
- Tensile Impact Strength: 20 ft-lb/in^2
- Rockwell Hardness: M-95 (ASTM D-758)
- Hole Dimensions: #8/M4 Fasteners: .60″ x .20″ and #6/M3.5 Fasterns: .20 x .16″
- Recommended Fasteners: #8 Torx®-Plus Pan Head Security Sheet-metal Screw, Stainless Steel (18-8 alloy) and washers. (Note the use of washers during mounting it essential to securing the crack monitor and to distribute load across the mounting surface area. Tighten by hand. Do not over-torque).
PHYSICAL
- Specific Gravity / Relative Density: 1.19
- Light Transmission-Total: 92%
- Water Absorption: 0.4% by weight (ASTM D-570)
THERMAL
- Thermal Expansion (ASTM D696, -30C to +30C): 54 µm/(m-°C), 30 µin/(in-°F )
- Maximum Recommended Continuous Service Temperature: < 85°C (185°F)
- Deflection Temperature @ 264 psi (1.8 MPa): 95°C (203°F)
- Melting Temperature: 150°C (300°F)
- Self Ignition Temperature: 445°C (833°F)
- Flammability: B2
- Flame Spread Index: 115 (ASTM E-84)
- Smoke Density Rating: 3.4% (ASTM D-2843)
