0

Green Roofs (Flat)


Knowledge of green roof construction methods and the benefits of incorporating them in building design is steadily becoming more widespread in the UK.

Unlike pitched green roofs, flat green roofs can either take the form of extensive (consisting of a thin layer of turf or sedum matting), or intensive (characterised by a greater soil depth that can even accommodate shrubs and trees).

How to Build a Flat Green Roof

Rooftop gardens are types of flat green roofs that provide valuable secluded green space in urban settings.

The build-up of a flat green roof will vary depending upon the intended use. Please contact our technical department on 01403 210204 or submit an enquiry for more information.

A standard roofing membrane and insulation layer is laid onto the underlying roof structure, then a studded, perforated drainage membrane such as Oldroyd Xv 20 GreenXtra is used in addition to provide a drainage layer with reservoir capability. A filtrating drainage layer is laid down before adding the required soil loading and plantings, as shown in the diagram above.

In situations where the roofing membrane does not offer adequate root resistance, a Safeguard Root Barrier layer may need to be included between the roofing membrane and the Oldroyd Xv 20 GreenXtra drainage layer.

Other examples of typical green roof build-ups can be found in our library of CAD drawings.

For rooftop gardens, concrete decking is often used to provide a suitable load-bearing construction, whereas substantial reinforcement is not usually required for a lightweight flat turf roof.

Biodiverse Roofs

Biodiverse roofs are flat green roofs which have been specifically designed with particular biodiversity objectives in mind – see our biodiverse roofs page for details.

Fixing Guide

Download the Oldroyd Flat Green Roof Application Guidelines

A guide to installing flat green roofs can be downloaded free of charge in PDF format by clicking on the image to the right.

The guide shows how Oldroyd Xv 20 GreenXtra can be used in conjunction with a primary waterproofing system to create a flat green roof.

Technical Support

If you would like more information on designing or specifying green roofs, please call our technical department on 01403 210204 or submit an enquiry.

Get it Done

Oldroyd Xv Green Pitched Green Roof Membrane (2m x 15m Roll) Drainage membrane specifically developed in Norway for use as a drainage layer for Scandinavian-style pitched green roofs.
£173.89
£{* exTotalPrice *} £{* totalPrice *}
All Articles
Advice
Case Studies
News
Case Study
Domestic Property Basement Renovation Part 1 – Drybase Tanking System

With Tibby Singh and YDC Basements, Safeguard waterproofed a basement at an end of terrace home in Leeds using Drybase Tanking System.

Read more
Drybase TS PLUS News Card Image News
Out Now: Drybase TS-PLUS

A durable and easy to apply layer for domestic and commercial applications on concrete and brick surfaces.

Read more
Case Study
1940s Concrete Pillbox, West Sussex — High-Performance Waterproofing with Stormdry Masonry Protection Cream

Built in Summer 1940, the Type 26 pillbox is a 6 ft by 6 ft cube just big enough to house 4 soldiers and their guns. The 1 m thick concrete walls were built to withstand a direct hit from a naval warship. 98 tons of concrete went into creating the pillbox. In the 1980s, the whole exterior was covered…

Read more
Different stages of Stormdry Masonry Protection Cream soaking in the wall. Advice
Masonry Sealants

Water is one of the main causes of structural damages to buildings. Moisture ingress caused by climatic influences, groundwater or condensation can lead to cracks and frost damage, as well as algae, fungus and moss growth. Over the years, salt and lime efflorescence can occur and severely disfigure masonry. In addition penetrating rain can introduce dirt into masonry and result…

Read more
New NOPE! Products Card (cropped) News
Out Now: New NOPE! Range

Fix fleas as well as other crawling and flying insects with new NOPE! Flea Killer Powder and NOPE! Insect Killer Smoke Bombs.

Read more
A flea on a fingertip Advice
How to Get Rid of Fleas

Most people worry about their pets when you mention fleas.  But a flea infestation is notoriously difficult to shift and can harm everyone in the home.  Find out how to get rid of fleas with this handy reference guide.

Read more
Case Study
Domestic Bungalow, Swindon - Cleaning and Preventing Mould

When Emerald Damp Specialists stepped inside a severely damp bungalow in Swindon, they knew they had to help. Along with 70 other companies and over 150 volunteers who donated their time and expertise, Emerald Damp Specialists resolved the extreme damp and mould problems at the property free-of-charge. For this project, ensuring that a valued member of the community had a…

Read more
Advice
Traumatic Damp

Penetrating damp, rising damp and damp caused by condensation are well recognised and documented within the building industry. The government guidance on damp and mould brought another form of dampness to light - one that is well-known but not often thought about in its own category. This new term for dampness caused by a leak or environmental flooding is 'traumatic…

Read more
Join our newsletter

Subscribe to get information about products and offers.