What Height Should a Dry Riser Outlet Valve Be Installed

The height of dry riser outlet valves comes from a combination of building regulations, British Standards and fire service guidance.

Determining the correct installation height for a dry riser outlet valve is essential for ensuring compliance, usability and firefighting effectiveness within multi storey buildings. Under BS 9990:2015, landing valves must be positioned so they are readily accessible for firefighting and can be operated quickly during an emergency without obstruction or delay.

Standard installation practice requires the bottom of the valve to be positioned 750 mm from finished floor level, which provides a safe operating height for firefighters. If valves are installed too low, users may need to bend or kneel, slowing deployment and increasing fatigue. Valves installed too high can be difficult to reach, especially when carrying heavy equipment.

Consistency across all levels is critical because fire crews rely on appropriate positioning when moving quickly through a building. Dry riser outlet valves are typically installed in the stairwell or a protected lobby and inside dry riser outlet enclosures, which have clear signage located on every floor, ensuring no time is lost in the event of a fire emergency. Overall, correct valve height enhances accessibility, speeds us response times and contributes to safer, more effective firefighting efforts in multi-storey buildings.

Correct positioning involves more than just setting the valve height. The cabinet itself should be positioned so that its base sits approximately 400 mm to 600 mm above finished floor level, allowing the valve and hose connection to sit at the appropriate height. These cabinets must always remain free from obstruction, meaning they cannot be blocked by stored materials, furnishings.

In our experience at Dry Riser One, we have seen cases where dry riser installations and its valves that were originally installed correctly become non-compliant because flooring levels were raised, decorative wall finishes were added or cupboards were installed in front of the enclosures affecting the door swing. Situations like these can significantly delay firefighting operations and may result in further action if discovered during inspection.

Professional installation and ongoing maintenance are therefore vital to ensure dry riser outlet valves remain compliant and functional throughout the life of a building. Measurements must always be taken from finished floor level rather than structural slab level so that final positioning remains accurate after floor finishes are installed. Regular inspections should confirm that cabinets remain clearly visible, accessible and undamaged, and that valve heights still fall within the acceptable range specified by BS 9990:2015. By engaging competent specialists such as Dry Riser One to install, inspect and maintain systems, building owners can be confident that outlet valves are correctly positioned, fully compliant and ready for immediate use by emergency services whenever required.