Gorgeous Green House

The Renovation Journey of a 1940’s ‘Traditional’ to 2015 ‘Contemporary, Green & Gorgeous’


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Architects Come to Visit: photo competition

Chen Sagnelli

Chen Sagnelli

We recently hosted a group of enthusiastic architects from Sagnelli Associate Architects.  They were challenged by Chen Sagnelli to take photos of any elements of the project they were inspired by. These they then presented to the team.

Ian Rall was the winner and its easy to see why. His images are beautiful and arty and the Gorgeous Green House looks incredible.  There were lots of lovely pics so I’ve included a cross section of some of the others.  It was really fun having them and hopefully they will be inspired to discuss with their clients the opportunities in going green without compromising on aesthetics in any way. Enjoy!

IMG_2296 (Copy)

Ian Rall

Ian Rall

Ian Rall

Ian Rall

Ian Rall

Ian Rall

Ian Rall

Ian Rall

 

Chantal Robertson

Chantal Robertson

Dhiagan Chetty

Dhiagan Chetty

IMG_1892 (Copy)

Dhiagan Chetty

Chen Sagnelli

Chen Sagnelli

Chen Sagnelli

Chen Sagnelli

Chen Sagnelli

Chen Sagnelli

Chantal Robertson

Chantal Robertson

Chantal Robertson

Chantal Robertson

Chantal Robertson

Chantal Robertson

image (9) (Copy)

Chantal Robertson

Chantal Robertson

Chantal Robertson

Chantal Robertson

Chantal Robertson

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Photo Update

The build seems to have accelerated, or maybe its just because we are starting to get to the best bits.  The most exciting installation, so far, is the vertical garden.  I’m going to be really mean though, and not show you a single picture yet because it is so magnificent, and the landscape artist James Halle is so talented, it has to have its very own post with lots of elaboration.  Watch this space!

Floating staircase

Floating staircase

The shuttering has come off the ‘floating’ staircase, and although this is not a green aspect of the build it is so beautiful I just need to show it off!

The interior painting has commenced.  There are loads of eco-friendly paints on the market these days.  They are much lower in volatile organic compounds (VOC’s) which basically means toxic stuff our bodies don’t like.  Confirm this with your paint supplier though because you won’t automatically get a low

Low VOC paint primer

Low VOC paint primer

VOC paint as there are still mixed perceptions about its efficacy.  Rest assured, they are equally effective and no more expensive than traditional.

veggie box

Mesh lining veggie box

The veggie garden now has 3/5 veggie boxes installed.  We are using a plastic timber product. These recycled planks are now widely available.  They are 100% recycled plastic so get great green points.  We lined the base with chicken mesh too keep out the moles.  Galvanized rods secure the sides from bowing out. This stuff will last forever, looks attractive, is easy to install and cheaper than recycled brick options which we had considered

3/5 Veggies Boxes Installed

3/5 Veggies Boxes Installed

Trichocladus crinatus

Trichocladus crinatus

I was really excited to see my Trichocladus crinitus (Black Witch-hazel) in flower. This small indigenous tree is quite rare and the petal form delicate and unusual.

Insualation Made From Recycled Plastic Bottles

Insualation Made From Recycled Plastic Bottles

There are lots of eco-friendly options for insulation these days.  We’ve gone with a product made from recycled plastic bottles.  The recycled newspaper product was a close contender.  The team on site report that the green stuff is really great to work with as it doesn’t shed prickly bits like the more traditional pink products.

 

Off Shutter Concrete

Off Shutter Concrete

The off-shutter concrete wall has had its first of two buffs and polishes.  It looks fabulous. I love the industrial /contemporary aesthetic and the honesty of the material.  Its a great ‘hard’ contrast to the green abundance of the garden.  Very happy with how its turned out.

Erythrina humeana

Erythrina humeana

The Erythrina humeana (Dwarf Coral Tree) are exquisite at the moment.  A really showy splash of red at the bottom of the garden.    

The pool has a new rectangular shape and fits snugly into the space of the old.  The reed beds are almost complete. It’s going to be great fun planting them up.  I’ll be sharing much more information on how to install an eco pool.  Suffice to say at this stage that the plants will do all the filtering of the water and no harsh chemicals will be required.  The plants and water provide the foundation for the wetland eco-system and we look forward to the

New Rectangular shape to pool

New Rectangular shape to pool

Reed beds constructed

Reed beds constructed

bird, amphibian and insect life we will be attracting.

Next to the veggie garden we have two of the Baunia’s in flower at the same time.  Gorgeous!

Bauhinia natalensis

Bauhinia natalensis

Bauhinia tomentosa

Bauhinia tomentosa

The whirly gigs are on site. Prith and Eamonn are finding them quite amusing.  Definitely a first for them as they are usually found in industrial builds.  We are putting them in to draw and pull up the cool air that will pass over the pond outside and into the hallway.  The best way to reduce the need for air conditioning in this space.

Whirly gig

Whirly gig

So overall fantastic progress!  And still so many of the best bits to come:

  • Vertical Garden (as promised)
  • Roof Garden
  • Rainwater harvesting
  • Eco Pool
  • Veggie garden
  • Chickens
  • Bees
  • Worm farming
  • Grey water recycling
  • Solar system
  • Induction geysers
  • plus…plus… plus

Gorgeous Green Architectural Design

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Several years ago when I started talking about my dream of building a ‘green house’ a friend said “oh I saw one of those … a kind of hobbit house…really ugly”  So the first misconception to clear up is that green design has nothing to do with the aesthetics of the house!  Whatever your taste (hobbit-like or otherwise) one can incorporate green design principles.  Essentially it means building in harmony with the natural environment and cooperating instead of fighting with the regional climate.  Green building takes a passive approach which requires less energy to run once the building is erected. It’s also know as bioclimatic design, eco-design, eco-friendly architecture, earth-friendly architecture, environmental architecture and natural architecture.

This post will focus on the design of the building itself, not the technology or specific materials to be used.  I will cover those aspects separately.

My house is in Durban South Africa.  We have an average of 320 days of sunshine a year. Temperatures range from 16 to 25º C in winter and  23 to 33º C in summer.  However, before you consider relocating, the warm Mozambique current flowing along our coast and summer rainfall means we also experience high humidity which can be quite debilitating from December to March.  So here is what we have briefed the architect to design into the house:

WINDOWS

We want light (lots of) but not direct sunlight which would heat up the house and require us to put in energy guzzling air-conditioners so one of the easiest things to do is install tinted windowsCross ventilation is also a vital consideration.  Windows were planned so that each room would have opening windows on opposite sides of the room.  The most challenging areas were the downstairs bedrooms which open onto the passage .  Tricky to get cross ventilation as you can see from the drawing below.

Bedrooms tricky for cross ventilation. Pond has low opening windows to draw in cool air

We did three things; firstly designed opening windows above the doors and small high windows (second floor not in view) that open up into the passage.  The passage windows slide sideways rather than level in our out so there are no unattractive or dangerous protrusions in to the passage.

Whirlybird

Secondly we have put whirly birds into the roof of the passageway to draw the warm air up and out of the house. These are fantastic low tech gadgets that are used a lot in factories but surprisingly not in residential properties.  The third thing we did was put opening windows at ground level next to the pond to draw in the cool air as it crosses the water.  Thanks for this great tip Greg Seymour greg@go-green-consult.com

OVERHANGS, EYEBROWS, FIXED LOUVRES AND TREES

Sun pouring into a building is a costly thing to mitigate. Passive solar cooling eliminates the need for air conditioning. The image at the top of the  page shows the house as it faces North.  In Durban this is the hottest elevation.  Fixed louvres will cut the sun’s strength considerably without blocking light.  The verandahs are wide so that even in winter when the sun is lower  it won’t penetrate into the house.  Elsewhere on the building are ‘eyebrows’ to shade windows.  Best of all (though not strictly a design feature) are trees and shrubs next to the building.  Many are deciduous so in summer they are full of leaves when most shade is wanted and in winter the drop their leaves when a bit more warmth is welcome.

CONCRETE AND ROOF GARDEN

Example of roof garden with plants I will also use

A study undertaken by Canadian researchers found that green roof habitats were very effective in reducing a building’s energy demands.   The results show that a conventional roof absorbs solar radiation during the day, creating a high daily energy demand for cooling internal air spaces. In  contrast, the growing medium and plants of a green roof habitat reduce the heat flow through  the roof by providing shading, insulation, and evaporative cooling (shown in green below). It was found that the green roof habitat reduced the daily energy demand for cooling by a whopping 95%!!  (If you’re interested in the tech stuff that’s from 19.3  kWh or 7,080 British Thermal Unit (BTU) per m2 for a building under a conventional roof to 0.9 kWh or 324 BTU per m2 for a building under a green roof habitat). Thermal mass is the term given to material (usually concrete or stone) which will absorb heat and prevent its entry into the home.  Although there are eco-negatives associated with concrete because  of it production processes judicious use can swing its rating into a green category.  In our house concrete (a lot)  has been required to build the base for the roof garden.  Its payoff though is immense at  many levels.  More to follow on the wider range of green roof benefits and how to actually construct your own.

ROOF DESIGN FOR SOLAR PANELS

Albizia shading area of roof originally allocated for roof panel

Ensure you plan carefully for the location of your solar panels.  We were quite ignorant of how many we needed (24!) and initially made provision for only 8 on a section that also gets much shade from an ancient and huge Albizia adianthifolia.  Our main roof was pitched – but the wrong way – which has led to delays with approval of plans as we’ve had to switch the pitch direction to accommodate the panels.  In Durban one cannot make changes during the build without the risk of inspectors shutting down construction while you wade through approval bureaucracy so best to get it right up front.  We’ve had expert help from Trevor Wheeler of  http://www.solarsunsa.co.za/  and I strongly advise you get your solar needs properly specified from a specialist before you submit your plans.  More posts to follow on the process of determining what your solar needs are.

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