Tag Archives: SuDS

Green roof in Wood Green

This is one I did last year that has been growing really well. The roof was on a new extension so the clients were able to design in extra big joists so we could support a good depth of soil on the green roof.

They managed to get a 5m extension so we had a good size to work with even with the skylights. It was waterproofed by the contractor ready for installation.

Roof before adding the greenery
Roof cleaned and prepared for installation

The team and myself laid out a protection fleece made from recycled material on the roof, then we added a drainage layer and put a filter fleece on the top to stop roots growing into it. Then we added the substrate, a special mixture of soil, lightweight aggregates, brick chippings etc, this is designed to keep the weight down, drain easily and also stop the plants growing too tall and need maintenance.

The team lay out the substrate

We put a gravel barrier round the edge of the roof and the skylights to assist drainage and add a firebreak. We also put extra gravel under the downpipe from the main roof of the house so the roof can absorb all the water from the roof rather than have it fill up the drains.

Moving materials is always a problem in London and we had to carry all the green roof substrate through the house and up on to the roof. Luckily Ecoalex has some good strong assistants so I didn’t have to do too much lifting. Once we had put out all the green roof substrate at varying depths we were ready to plant.

Planting, workers grass
Roof ready to be planted

For this roof I had a mixture of mature plants and seeds. I included some Stipa tenuissima (the grassy stuff in the foreground) for the first time to see how it would grow and although it browns a bit in the dry periods it seems to be thriving. We also put in a few varieties of sedum to get some ground coverage including house leeks. Other plants included sea burnet and Sempervivum. I picked up all these plants at New Covent Garden Flower market in the morning a great place to pick up plants in London. But these are just to start the roof, the main coverage will develop over the next three years with all the green roof seeds we have planted I used a couple of mixes of native wildflowers including this one from Scotland that has 20 wildflowers and 3 grass species in the mix . Not all these will thrive initially but over time they should each find their own niche on the roof and grow nicely. Gary Grant likes to describe these seed mixes as an orchestra with all the instruments waiting for the conductor to call them in at the appropriate time in the green roof’s own symphony. Below are some pictures of the roof planted and how it has developed this year. More will be added over time.

Low impact green roof in Marlow

Lots of green roofs going in recently and I need to spend more time documenting them. This one in Marlow on a garage was a new design that I am quite pleased with.

I have been working for a while to reduce further the plastics going into a green roof. I used to work with SUDS (Sustainable Urban Drainage Systems) a lot in the past and one thing I always noticed was the number of pipe manufacturers trying to shoehorn more plastic into natural drainage systems. Roofs obviously need to be waterproof so I can’t change that bit and we need something to protect it from sharp objects etc. Then comes the drainage layer which is lots of plastic sheets, this is important to hold a bit of moisture but also to makes sure it drains effectively. So drainage is important for weight but maybe we can make it of something else. For this roof we used aerated clay balls wrapped in a filter sheet that is held in place with some extra large cobbles. So the plastic is at a minimum.

The cobbles add a really nice touch to the edge of the roof and enhance the appearance considerably especially on a roof like this where there is no parapet. The soil is also held in place by the cobbles and I guess some of it may wash between them but not off the edge of the roof.

The roof has been planted with about 15 different plants, some sedum and ornamental, seeded with 30 different wildflowers and also bulbs planted to come up later in the year. I am monitoring progress and plan to pick up some crocus bulbs in autumn to plant.

Finished roof

If you like the look of this, drop me a line or give me a call 020 8133 0190 and I can see what we can do for you.

Extension in Kennington with green roof

I went to visit an extension in Kennington which has the biggest domestic green roof I have built. There are some very big skylights so it isn’t all green but it looks great. This first picture shows the rear extension with some rather fine timber cladding, you can see the plants poking over the top of the coping stones:

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The combination of rain and sunshine we have seen this summer has been really good for the plants, even if people haven’t been so happy. I missed the peak flowering of this roof but there were still plenty in bloom on Monday. The clients daughter has a bedroom window looking out onto the roof and has been enjoying the developing scene.

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The skylights really bring light into the house and the kitchen looks even bigger than the space the extension added on. You can see some of the plants waving in the breeze around the sides when you are having dinner.

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Reclaimed materials in side return extension in Hackney

A side return infill extension with an industrial style. Extensive use of reclaimed materials, high standards of insulation and a wildflower green roof.

We completed this project late on last year working with Clements Design as the architects.

The project aimed to turn a cramped kitchen into a spacious area for cooking, eating and socialising. There is an industrial and sustainability theme to the project, the materials used are often from or designed for factories. Electrics are contained in galvanised metal conduit and the floor is concrete. Walls are exposed brick, both reclaimed glazed brick and the existing London stock bricks revealed to the world. The large glass panels to the roof draw in light to what was once a dark area and bring out the rich colours in the reclaimed wood cladding.

Though the materials could be seen as austere they are softened by the contents of the room that reflect family life, there is space for a large wooden toy stove, a comfy sofa and a gorgeous oak dining table with mismatched chairs.

The large rear doors mean the garden can be seen and accessed easily from the house, the doors can be flung open in the summer for barbecues. The green roof will develop over time but already has wildflowers peeking over the parapet and they can be seen swaying through the glass roof.

The project was also designed in conjunction with the neighbours and they share the party wall and the box gutter.

Sustainability was a key part of the client’s aim for the project. Reclaimed materials were used wherever possible. All the bricks removed in the demolition stage were cleaned and re-used onsite to build the new structure. Internally there are two walls of glazed bricks reclaimed from a lift shaft in Kensington. The other walls are the original brick exposed and insulated on the outside where appropriate. The bi-fold doors are triple glazed with a u-value of 1.09 are factory finished for long life and are made from environmentally sourced timber from sustainable forests. The heating is underfloor and utilises the existing condensing boiler, three Nest controls were added to the system to control this and create two new heating zones in the house.

The wood (for drawer fronts, shelves and cladding) is from a reclaimed wood specialist in Guiseley, Leeds, called Machells and is cut down from Yorkshire Victorian mill joists.

The large pendant lamps are reclaimed from a 1950’s factory in the Stoke area.

The table was made in Leeds from British oak 35 years ago.

All the shelf brackets and drawer handles were made in England in foundries using all traditional methods.

All lighting is LED, even filament style traditional bulbs are actually LED.

The green roof is part plug planted and part seeded with a mixture of wildflowers, meadow plants and some sedums. The roof will flower through most of the year and provide habitat for insects and foraging for birds amongst other biodiversity benefits.

Nine months in and this green roof has been thriving

I went to see the roof I built in Kennington last month and took some photos I thought I would share. I wrote about this one last year showing the build up process to a green roof. I was particularly pleased that the insulation we put on as an added extra has made a real difference to the householders, the side return was previously a no-go area in the cold winter months but has now become habitable with the added warmth.

Anyway here are a few photos to illustrate how well the roof has been growing over the last nine months:

The flowers are growing well including the grape hyacinth
The flowers are growing well

A really good selection of wildflowers has sprung up
A really good selection of wildflowers has sprung up

Maybe I should have made the middle access a little narrower
Maybe I should have made the middle access a little narrower

Overall I am delighted with the roof and the clients are really pleased too. The roof has already developed really well and should develop further over the next few years. The roof should reach maturity after three years but different plants will dominate in different years and seasons.

If you want your own green roof give me a ring on 020 8133 0190 or drop me an email alex@ecoalex.com

 

 

Will making my house green save me from the zombie apocalypse?

I was pleased to see lots of discussion of the zombie apocalypse on twitter the other day, all sparked by this blog from the US Centre for Disease Control http://blogs.cdc.gov/publichealthmatters/2011/05/preparedness-101-zombie-apocalypse/ So I was thinking about how the zombie apocalypse might affect my business of eco retrofitting, pretty badly I think and I am not sure a bicycle is the right mode of transport to escape from zombies. However I did realise that many of the measures you take to improve the environmental performance of your house would also help you come the zompocalypse.

Draught proofing and insulation are essential to cut noise that would reveal your presence to any lurking zombies and also help reduce the chances of any airborne infections. Traditional methods of keeping your house warm, heavy curtains, shutters etc will stop any tell tale flickers of light from your zombie hideaway.

Evading zombies is dirty work so coming home to solar thermal water heating means you can wash the smell of fear right off, providing you can get a safe source of water that is. Perhaps a pond on your green roof could help with this? Of course a green roof could also provide some much needed fresh veg to supplement your diet of looted cans and dried food.

Assuming the zombies have knocked out the sewer and drainage facilities things will be getting pretty smelly so a SUDS system with plenty of reed beds will be an excellent way of processing your waste while reducing possible flooding issues in your neighbourhood.

I also guess that the zombies will have taken out the power network so you will need some way to power your SOS signals for help. Photovoltaics on the roof should solve this as well as providing some power for low energy lighting to illuminate your weapon stripping.

Not sure what happens in the winter, it always seems to be hot in zombie films but I am guessing that even if the zombies do die out power and fuel will still be scarce so ground source heat pumps would be a good way of heating your hideout. If you meet with others and develop a compound you can start to add other measures: a combined heat and power plant would maximise what fuel you have and perhaps a wind turbine wouldn’t attract interest from the zombie hordes.

In summary therefore, going green will help when the zombies come! Next up ‘The rise of the machines, will biodiversity help us fight back?’