Harmer Rainwater Outlets
Harmer Detail Roof Outlets are designed to cover all the awkward detailing situations that occur in building design and refurbishment. The range includes balcony, gulley and car park outlets and two way outlets for use where the roof surface abuts a wall or parapet.
Harmer Roof AV Vertical rainwater outlets are designed for use with flat roof structures using either insitu cast concrete, timber or lightweight metal deck construction. Harmer Roof outlets are ideal for connection to continuous waterproofing systems using single ply membranes, mastic asphalt, high performance built-up felt, hot melt systems and wet-applied systems.
Frequently Asked Questions
Which roof constructions can use Harmer AV outlets?
Harmer AV vertical outlets are intended for flat roofs formed on in-situ concrete, timber or lightweight metal decks. The outlet body, extension, connection and support detail must match the roof construction and insulation depth.
Which waterproofing systems can connect to Harmer outlets?
Harmer publishes options for continuous waterproofing systems including single-ply membranes, high-performance built-up felt, mastic asphalt and liquid-applied waterproofing. The correct clamping, flange or bonding arrangement must be selected for the membrane.
When is a Harmer Detail outlet required?
Detail outlets address balconies, gullies, car parks, parapet abutments, two-way drainage and other locations where a standard vertical outlet may not suit the geometry. The designer should select the outlet from the actual drainage and interface detail.
Why are many Harmer outlets made from aluminium?
Harmer uses cast aluminium to provide a lightweight, durable and corrosion-resistant outlet body. Published life expectancy varies with rural, industrial and marine exposure, and compatible gunmetal options may be required where copper or lead is present.
How is the correct outlet size selected?
Outlet size and quantity should be calculated from the design rainfall intensity, effective roof area, permitted head of water, outlet performance and emergency-overflow strategy. Product compatibility alone does not confirm compliance with the drainage design.