Dry Riser Testing Requirements Explained

Summary

A dry riser is an empty vertical pipe built into a building specifically for the fire and rescue service — firefighters connect a pumping appliance to the ground-floor inlet and pump water up to a landing valve on the floor they're fighting a fire from, rather than dragging hose up multiple flights of stairs. It has no water in it under normal conditions (unlike a wet riser, which is permanently charged and pressurised, typically required above 50m). Because a dry riser only gets used in a genuine emergency, a fault — a seized valve, a corroded inlet, a leak that bleeds pressure away mid-fire — is invisible day-to-day and is only discovered when it's too late. Testing exists to catch that failure before it matters.

This matters to a wide range of trades and building professionals: block managing agents, facilities managers, fire risk assessors, and the plumbing/fire-protection contractors who actually carry out the pressure test and any remedial work. Landlords and freeholders of blocks of flats, and duty-holders for commercial buildings with a riser installed, are the ones who carry the legal responsibility — but it's common for the actual testing to be subcontracted to a specialist fire protection company, and for the responsible person to only find out there's a problem when the test report lands. A common misconception is that a dry riser "doesn't need maintaining because it's never used" — in fact the opposite is true: an unused system is exactly the kind that silently degrades (corrosion, dried-out valve seals, vandalism, debris) without anyone noticing.

Since the Grenfell Tower fire and the subsequent Fire Safety Act 2021 and Fire Safety (England) Regulations 2022, enforcement of basic fire-fighting equipment maintenance in residential blocks has tightened considerably, and dry riser testing records are now a standard item fire and rescue services and enforcing authorities ask to see during a building inspection.

Key Facts

• Governing standard — BS 9990:2015, Non-automatic fire-fighting systems in buildings — Code of practice. Covers design, installation, testing and maintenance of dry and wet risers.
• Six-monthly visual inspection — checks for vandalism, theft, corrosion, missing caps, obstructed access, and general condition of inlets, landing valves and drain valves. No pressure applied.
• Annual wet pressure test — the system is charged with water and pressure-tested to 12 bar, held for a minimum of 15 minutes, checking every inlet, outlet, valve and joint for leaks.
• Buildings requiring dry risers — typically buildings between 18m and 50m in height (Approved Document B), measured to the top floor. Below 18m a riser is not normally required; above 50m a wet riser is normally required instead because pump pressure alone cannot reliably reach the top of the building.
• Landing valve (outlet) — one provided at every floor level including the ground floor, conforming to BS 5041-2, with the lowest point fitted approximately 750mm above floor level.
• Inlet (breeching) — a two-way inlet for 100mm risers to BS 5041-3, mounted in an inlet box to BS 5041-5, sited between 400mm and 600mm above ground level for fire service pump access.
• Who tests it — a competent person, normally a specialist fire protection contractor; the standard does not require a specific certification scheme, but competence and documented experience are expected under BS 9990 and by enforcing authorities.
• Responsible person duty — under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must ensure fire-fighting facilities are subject to a suitable system of maintenance and are kept in efficient working order and good repair.
• Records — test certificates and inspection logs should be retained on site (or with the managing agent) and produced on request by the fire and rescue service or a fire risk assessor.
• Historical context — dry and wet riser provision was historically dealt with within the BS 5306 series (fire extinguishing installations and equipment); BS 9990:2015 consolidated design, installation and maintenance of non-automatic fire-fighting systems into a single standalone code of practice, while hose reels and portable equipment remain covered separately in BS 5306-1 and related parts.
• Post-Grenfell tightening — the Fire Safety Act 2021 and Fire Safety (England) Regulations 2022 clarified that external fire-fighting equipment, including risers, falls within the scope of a building's fire risk assessment and the responsible person's duties.
• Common test failures — seized or leaking landing valves, corroded inlet couplings, missing or damaged inlet box doors, debris/blockage in the pipe, failure to hold pressure over the 15-minute test (indicating a leak somewhere in the run), drain valve failure.
• Draining after test — the riser must be fully drained after the wet pressure test; residual water left in a "dry" riser can freeze in winter and split pipework, or promote internal corrosion over time.
• Access for testing — testing requires access to every landing valve on every floor, which means liaison with occupiers/tenants in advance — a common practical delay in occupied residential blocks.
• Combined systems — some buildings have a dry riser that also serves a sprinkler boost connection or is combined with a wet riser system on the lower floors and dry on the upper floors; these require the specific manufacturer/installer's maintenance schedule in addition to BS 9990.

Quick Reference Table

Detailed Guidance

Who is legally responsible

Under the Regulatory Reform (Fire Safety) Order 2005 (the "RRO" or Fire Safety Order), the "responsible person" — usually the employer in a workplace, or the person(s) with control of common parts in a block of flats (landlord, freeholder, or managing agent acting on their behalf) — has a general duty to take reasonable fire precautions and to ensure that any facility provided for the safety of relevant persons, including a dry riser, is maintained in an efficient state, in efficient working order, and in good repair. Critically, this duty exists whether or not the responsible person personally understands fire protection systems — it's a duty to arrange competent maintenance, not to carry it out personally. In a residential block, the managing agent typically arranges the contract with a fire protection company; the freeholder or Right to Manage company remains legally accountable if it isn't done.

The six-monthly visual inspection

This is a walk-round check, not a pressure test. A competent inspector opens each inlet box and landing valve cupboard and checks:

• Inlet box door present, closing correctly, not obstructed by parked vehicles or bins
• Breeching inlet caps in place, threads undamaged, no signs of tampering
• Landing valve cap present and undamaged at every floor
• No visible corrosion, leaks, or damage to visible pipework
• Signage present and legible (riser location signage is a common defect)
• Access route to the inlet clear for fire and rescue service pumping appliances

Any defect found should be logged and rectified before the next annual pressure test, not left to accumulate.

The annual wet pressure test

This is the substantive test and the one most likely to reveal a genuine safety-critical fault. The process typically runs:

1. Isolate and prepare — confirm riser is out of use, notify building
   occupiers of works and any noise/access disruption
2. Connect test pump to ground-floor inlet
3. Charge the riser with water, bleeding air from the highest landing
   valve first
4. Pressurise to 12 bar
5. Hold for a minimum of 15 minutes
6. Check every joint, valve, and coupling on every floor for leaks
   while under pressure
7. Record pressure drop (if any) — any drop indicates a leak requiring
   investigation and repair, then a re-test
8. Fully drain the system after the test — no residual water left
   in the "dry" pipework
9. Reinstate signage, caps, and inlet box, issue test certificate

A pressure drop during the hold period is the key pass/fail indicator. Even a small, slow drop means there's a leak path somewhere in the system that will reduce the pressure and flow available to firefighters in a real incident — this must be traced and repaired, then the section retested, before the certificate can be signed off as a pass.

Buildings that require a dry riser

Approved Document B (Fire Safety) sets the height thresholds that trigger a requirement for fire mains. As a rule of thumb: buildings with a top floor between roughly 18m and 50m above the fire service vehicle access level need a dry riser (because a pumping appliance can reliably push water up to about 50m); buildings above roughly 50m normally need a wet riser instead (permanently charged and pressurised, because relying on pump pressure alone from ground level becomes unreliable at that height). The exact trigger height, riser type, and number of risers depend on the building's specific layout, travel distances, and fire strategy — this is a fire engineer/Building Control decision at design stage, not something to assume from height alone. Refurbishment or change-of-use projects that push a building's effective height should always trigger a fresh check against current Approved Document B guidance.

What a contractor needs on site to carry out the test

• A calibrated test pump capable of reaching and holding 12 bar
• Test certificates/log book template (or digital system) recording pressure, hold time, and any defects found by floor
• Access to every landing valve — this normally means prior notice to residents/occupiers of every floor, not just the ground floor inlet
• Spares for common wear items — landing valve washers, inlet cap seals — to fix minor defects on the same visit rather than requiring a return trip

Consequences of neglecting testing

If a dry riser fails during a real fire — because pressure was lost through an undetected leak, a valve was seized, or the pipe was obstructed — the consequence is firefighters losing their primary means of getting water to height quickly, at exactly the moment it matters most. Beyond the direct safety consequence, an enforcing authority (the local fire and rescue service acting under the RRO) can serve an enforcement notice or prosecute the responsible person for failing to maintain fire-fighting facilities, and a fire risk assessment that identifies an untested or faulty riser as an outstanding "significant finding" left unaddressed materially increases both regulatory and insurance exposure for the building owner.

Frequently Asked Questions

How is a dry riser different from a wet riser, and does that change the testing regime?

A dry riser is empty until the fire service pumps water into it during an incident; a wet riser is permanently filled and pressurised, usually with a fire pump set maintaining pressure automatically. Both are covered by BS 9990:2015, but a wet riser's automatic pump set and pressure-maintenance equipment require additional routine servicing (weekly pump run tests, for example) on top of the six-monthly and annual riser-specific checks — wet riser maintenance is a more involved, more frequent regime than dry riser maintenance.

Can the six-monthly inspection be combined with other planned maintenance visits?

Yes, and in practice it usually is — many managing agents bundle the dry riser's six-monthly visual inspection into a wider fire safety inspection round covering fire doors, extinguishers, and emergency lighting, carried out by the same contractor on the same visit. The annual pressure test is normally a dedicated visit because it requires the test pump and takes longer per floor.

Who pays for dry riser testing in a block of flats?

The cost is normally recovered through the service charge, as part of the building's general fire safety and common parts maintenance budget, since the riser serves the whole building rather than any individual flat. Leaseholders can reasonably expect to see the test certificate and any remedial cost referenced in the service charge accounts.

What happens if a defect is found during testing?

The defect is logged, and remedial works (valve replacement, re-sealing a joint, clearing an obstruction) should be carried out and then the affected section re-tested before the system is signed off as compliant. A responsible person should not leave a known defect unaddressed between test cycles — under the RRO, a known fault in a fire-fighting facility is a significant finding that needs acting on, not filing away until the next annual test.

Do dry risers in new buildings need commissioning testing separate from BS 9990?

Yes — a newly installed dry riser is commissioned and pressure-tested as part of the installation sign-off (also to the pressures and durations set out in BS 9990:2015), witnessed by Building Control or the fire engineer as part of the completion certificate process, before the ongoing six-monthly/annual maintenance regime begins.

Regulations & Standards

• BS 9990:2015 — Non-automatic fire-fighting systems in buildings, code of practice: design, installation, testing and maintenance of dry and wet risers

• BS 5041 series (Parts 1–5) — fire hydrant system equipment, including landing valves (BS 5041-2), inlet breechings (BS 5041-3), and inlet boxes (BS 5041-5)

• BS 5306-1 — fire extinguishing installations and equipment on premises: hose reels and foam inlets (remains relevant alongside BS 9990:2015, which does not cover hose reels)

• Approved Document B (Fire Safety), Volume 2 — sets out the building height thresholds and design requirements that determine whether a dry or wet riser is required

• Regulatory Reform (Fire Safety) Order 2005 — places the duty to maintain fire-fighting facilities, including dry risers, on the "responsible person"

• Fire Safety Act 2021 — clarifies that external walls, flat entrance doors, and fire-fighting equipment fall within scope of the fire risk assessment

• Fire Safety (England) Regulations 2022 — additional duties on responsible persons for higher-risk residential buildings, including record-keeping

• BSI — BS 9990:2015 Non-automatic fire-fighting systems in buildings — the governing code of practice

• GOV.UK — Regulatory Reform (Fire Safety) Order 2005 guidance — responsible person duties

• GOV.UK — Approved Document B: Fire Safety — building height thresholds for dry/wet risers

• British Automatic Fire Sprinkler Association (BAFSA) — Wet & Dry Riser guidance to BS 9990 — technical background on riser design and testing

• GOV.UK — Fire Safety Act 2021 — scope clarification for fire risk assessments

• fire risk assessment — when a fire risk assessment is required and how riser maintenance fits into it

• fire safety order — full detail on the Regulatory Reform (Fire Safety) Order 2005 and responsible person duties

• sprinkler systems — automatic fire-fighting systems compared to non-automatic risers

• passive fire protection — how active systems like risers fit alongside passive compartmentation measures