FREQUENTLY 
ASKED QUESTIONS.

JKH designs, manufactures and delivers specialist precast concrete drainage solutions—including headwalls, inspection chambers, gratings/steelwork and memorial bases—with both standard and bespoke options produced in-house.

Nationwide delivery of stock items is typically 1–2 weeks, supported by our FORS Silver-accredited fleet, with crane/forklift offloading support available on request. For smaller stock items dispatched via pallet courier, delivery is typically 2–3 days from order.

Yes. ECO 1 is JKH’s standard low-carbon concrete blend (optional ECO 1 ULTRA), reducing cement by 46–70% and CO₂e by 12–49%, while remaining fully compliant with BS 8500-2:2023.

Certificates (e.g., BS EN 1090, BS EN 15258, ISO 9001, ISO 14001, FORS Silver) Can be found in our Knowledge Hub to download

For enhanced spec data and BIM files, you can request access to our design portal here: 

JKH’s UKCA marking is supported by compliance with BS EN 1090 (steelwork execution) and BS EN 15258:2008 (precast concrete retaining wall elements), per the UK Construction Products Regulations.

Yes. JKH holds UKCA Certificate No. 0086 CPR 650448 (BSI Approved Body 0086) for precast concrete products aligned to BS EN 15258:2008.

Yes: When specified, JKH can supply precast solutions using CARES-accredited reinforcement for enhanced traceability and assurance in safety-critical applications.

ECO 1 is JKH’s proprietary low-carbon concrete blend that reduces cement content by ≈46% (and ECO 1 ULTRA by ≈70%), typically saving 12–49% CO₂e vs. traditional CEM I, while maintaining CEM I-equivalent performance.

Yes—ECO 1 and ECO 1 ULTRA are fully compliant with BS 8500-2:2023 and achieve Design Chemical Class 4 and Design Sulphate Class 4 for durability in aggressive environments.

ECO 1 is the standard mix for 100% of JKH products; ECO 1 ULTRA is available on request for further carbon reductions.

ECO 1 helps project teams reduce embodied carbon without compromising strength (typical >75 N/mm² at 28 days)—supporting corporate and public-sector net-zero frameworks.

Headwalls protect outfalls and watercourse banks by reducing erosion/scour at discharge points and safeguarding pipework from hydraulic damage—critical for long-term drainage performance.

JKH provides 300, 600, 1000, 2000, 2800 series plus GRC and specialised variants (e.g., Water Control Headwall), accommodating pipes up to Ø100–2000mm depending on model

Yes—steel gratings, handrails, flap valves, penstocks and other flow control devices can be factory-fitted; coloured concrete and powder-coated steelwork are available for sensitive sites

Product pages include installation advice, and designers can register for the design portal to access extensive BIM/CAD technical drawings.

Off-site manufactured precast headwalls accelerate installation, cut labour, aid environmental compliance, and reduce contamination risk—ideal for large developments and civil engineering works.

Chambers are typically installed at changes of direction, as rodding points, and for lateral connections at depth; they can also tumble flow on steep sites.

JKH manufactures a range of precast chambers, including V Chambers (square design up to D400 loading) and soakaway chambers up to 14,400 L, alongside GRC and Big J variants.

The V Chamber’s square geometry preserves structural integrity with large openings, reduces joint sealing length, speeds two-piece installation to 3 m depth, and minimises excavation/backfill.

Standard and special gratings (galvanised/stainless) including bespoke catwalks and access hatches, handrails, aluminium stoplogs assemblies, vermin gates (hinged, for Ø 60–300mm pipes), and orifice plates.

Steelwork is manufactured under BS EN 1090, supporting UKCA compliance for structural steel items.

Yes—powder-coated steelwork is available in RAL colours, and coloured concrete options help installations blend into landscapes.

Foundation slabs and related memorial bases are manufactured to BS 8415:2018, aligned with BRAMM/NAMM guidance

Standard 3″ thick slabs (with 1–3 vase holes) and made-to-order 2″/3″ slabs; saddles for memorials and war grave saddles (e.g., 35″ × 15″ × 6″) supplied typically in pallet quantities.

Yes—JKH’s fleet provides nationwide delivery, with FORS Silver compliance and crane/forklift offloading available when requested.

Register via product pages (e.g., headwalls) for access to JKH’s design portal, offering extensive BIM/CAD files and technical drawings.

Yes—JKH partners with NBS Source, where specifiers can browse products, case studies and third-party certifications in NBS standardised formats.

Design (SolidWorks/AutoCAD), steel fabrication, concrete casting across a 250,000 sq ft facility—with more than 150,000 headwalls produced to date.

JKH operates ISO 9001 and ISO 14001 management systems.

Stock items: 2–3 days dispatch; made-to-order products typically 2–4 weeks (check product page for current availability).

Yes—crane/offloading support is available on request; many vehicles are equipped for forklift offloading.