Electricity prices are rising so install a green roof

Today I arrived home from work to a seasonably chilly house and a husband who's mood could only be described as icy....our electricity supplier has announced an 11% price hike and he's not happy.

So what does that have to do with green roofs?

Newly installed green roof just begging to
have PV panels added

Well, to start with, a green roof is a fantastic insulator, keeping a building warmer in winter and cooler in summer so savings there on the heating bills.  I speak here for the lucky souls who happen to have "greenable" roofs on their homes.  Our house was build long before electricity, let alone green roofs.  It has a steeply pitched, tiled roof and although it's strong enough to support a green roof buildup, the installation and maintenance would be a nightmare.  So, until we retire into something more suitable, there'll be no living roof on our house to help save electricity; 

So what about generating our own power with solar panels?  My friend Ginny and her husband Chris swear by them.  Chris installed PV panels on their roof in Essex and when they moved to the depths of deepest Norfolk, the solar panels came too.  Apparently the solar panels provide all the hot water they need in the summer months so the only fuel they use between late spring and mid-autumn is for cooking, boiling the kettle for tea and maybe watching a bit of telly.

Again, hubby says PV panels won't suit the look of our pretty house, BUT, being a farm, we do have outbuildings and so maybe he'll be persuaded to put use at least one of them to generate our own power and show the electricity company what he thinks of their pricing structure.

If however, he installs PV panels in conjunction with a living green roof, we'll be quids in.   Solar panels work best when the temperature is below 30 degrees celcius. Of course on a roof, in summer, temperatures can rise a lot higher than 30 degrees, thus rendering the PV panel less efficient; but if it's a green roof, the cooling effect of the plants will keep the temperature more comfortable and the PV panels will be more efficient.  PS...remember to design the roof so that panels are not casting shade over the sedum plants..they don't enjoy being kept in the dark

Research in Germany compared  PV cells over a green roof  with cells over Bitumen roofs. In over 5 years of recording, the panels over the green roof showed an average 6% increase in yields

I like it! So here I am, in my kitchen, log-fired Rayburn creating a nice warm fug around me.  Laundry is drying on the clothes horse in front of the fire, kettle is whistling and I'm wondering how I can persuade my dearly beloved to leave the comfort of the armchair to climb on the roof, install some Enviromat and wire in some PV panels before electricity prices go up in December.  I'll let you know how I get on.

Oh....if you fancy a green roof yourself, drop me a line and I'll send you a copy of our "how to" guide and a phone number for our installation man in case you'd rather sit by the Rayburn and let someone else do the work (like me)

Butterflies and bees on sedum mat

The Sedum spurium in Enviromat sedum matting always looks fantastic at this time of year and it's a great source of nectar for butterflies and bees. 

Here are some pictures I took outside our office this morning (18th September)

butterfly on S. spurium

bumble bee feeding on Sedum flower

sedum spurium - a popular flower with late summer butterflies

butterflies add extra colour to Enviromat sedum matting

bumble bees don't mind a slight drop in temperature so long as they have flowers to feed on

Meadows on Green Roofs

Peppa Pig World has a fabulous wild flower meadow growing on it's roof.  But how should wild flowers best be established on a smaller green roof and is Q Lawns' product Meadowmat the best way to go about it? 

This isn't Meadowmat on a roof but you can see that
a very grassy green roof could be difficult to manage

At first glance, you might think Meadowmat is a good green roofing material.  It has a great mix of native species, growing on to a matting system so it's easy to handle and gives instant coverage.  But, Q Lawns  also grow Enviromat sedum matting on our farm and we have a green roof maintenance service so we’ve had a little bit of experience with living roofs and in all honesty, Meadowmat isn’t ideal for several reasons

·         Meadowmat contains 34 species of native plants, all of which are found naturally in meadows, pastures etc.  Some of these plants are adapted to living in really poor soils so they’ve evolved vigorous root systems that can spread a long way to find the nutrients the plants need.  Vigorous root systems + green roofs could cause difficulties

·         The minimum depth of growing medium to establish Meadowmat into is 150mm.  That will weigh around 250Kg per square metre….an awful heavy load to put on a roof unless the building has been designed and built especially to carry that weight

·         50% by weight of the Meadowmat seed mix is grass.  A certain amount of native grasses are needed to supply food for insect larvae and shelter for amphibians and small furry creatures.  On a roof though, too much grass is a nuisance.  Meadows need careful maintenance to ensure that the grasses don’t predominate and crowd out less competitive flowering species.  That means taking a cut of hay in the summer….all of which needs to be brought down from the roof, and then mowing it a couple of times during the autumn and winter and again, removing all of the cuttings.  Unless you have really good access to the roof, the maintenance regime for Meadowmat just isn’t practical

·         Some of the plant species in Meadowmat can grow quite tall (I have Meadowmat in my garden which is currently at hip height) and in windy, blustery conditions, they blow over and all lay on the ground in a heap with the plants on the bottom of the heap being smothered out and killed.  On the roof, conditions tend to be more extreme than at ground level…hotter and drier in summer, colder in winter and windier all year round.  It’s best to stick to low growing plants that can cope better with the conditions

An Enviromat green roof is relatively lightweight and
has a long flowering period

Enviromat is the ideal vegetation blanket for creating a green roof……..it’s a relatively lightweight build-up and the plants, when in the wild, tend to be found on mountain tops, moors and heaths where they are adapted to living in exposed conditions.

If you are dead-set on growing wildflowers on your roof, be careful to select ones that are not too tall, can survive in exposed conditions, won’t need a huge amount of maintenance and give a nice long flowering period to provide nectar for butterflies and bees.  Also, avoid grass in the seedmix if you can….you’ll find that by sowing wildflower seed or planting wildflower plugs, grass will naturally establish itself in the spaces between flowering plants.

Green roof is a real eyecatcher

This shepherd's hut with a sedum roof attracted a lot of attention at the BALI Landscape Show at Stoneleigh on June 19th and 20th.   The roof was created using Enviromat sedum matting and took less than an hour to install.

First of all, Mark Pawsey, our Green Roof Manager, spread a layer of polyethene over the roof to protect the waterproofing from potential damage from roots and boots.

Next he added a layer of water retention matting...Mark's top tip:  always measure the roof and cut materials to size on the ground...that way you won't accidentally cut through the waterproofing.

Finally, the Eviromat sedum matting was lifted on to the roof and manouvred into position.  It took two people to lift each piece of Enviromat on to the roof, but Mark did all the fitting by himself, before watering the sedum plants thoroughly.

Minutes later, the roof recieved several visitors in the form of hungry bumble bees who found a feast of pollen and nectar from the sedum flowers.

Welcome

Welcome to the new blog from Enviromat green roof services.

Enviromat work closely with the UK’s leading green roof installation company; growing their sedum matting and helping to research and develop new ways of establishing plants on to green roofs of all shapes and sizes.

We also make Enviromat sedum matting available to builders and gardeners who want to create small scale green roofs on garden buildings, extensions and the like. We're also developing a native species mix for folks who want something a bit different.

This blog aims to provide as much information as possible on creating a living green roof, from loadings to plant choices, installation tips to aftercare advice.

Please use the comments box to ask as many questions as possible can and we will answer them as quickly as we can.

Our first post is about plant choices...click here to find out what to consider when you're choosing the plants for your green roof.