Vertical slats for the staircase

Vertical slats to let the light come down the stairwell from the skylight and south facing window on the top floor.

I want the vertical slats going to the floor or the ceiling. So like this for at the bottom:

vertical wooden wall on the stairs

&

vertical wooden wall 08

The top / cap to the vertical slats to be capped with a hand rail, as shown below:

vertical wooden wall hand rail cap

The slats give a continually different view / aspect.

http://www.houzz.com/ideabooks/2576588/list?utm_source=Houzz&utm_campaign=u111&utm_medium=email&utm_content=gallery3

 

A nice post about Accoya wood

http://blog.emap.com/footprint/2011/08/08/accoya-used-to-build-bridge-in-the-netherlands/

I’ve since learnt that (unless it’s changed and the info is out of date or wrong) that Accoya wood is grown in NZ & treated in the Netherlands. So the transport carbon footprint isn’t great. It’s then consequently expensive.

http://www.gowercroft.co.uk/2013/03/what-is-accoya-timber/

“The downside to this material is that while the trees are grown in New Zealand and the acetylisation process occurs in The Netherlands, it will always be expensive. The raw timber costs three times as much as our standard hardwoods.”

The geographic growing and processing isn’t mentioned on the Accoya website that does cover a lot of other good environmental aspects of Accoya:

http://www.accoya.com/sustainability/

Polar bear inspired external wall heating system

Follow the bears

The biomimicry-based technology imitates the effect of fur on polar bears, the individual hairs on the polar bear being hollow and guiding sunlight directly to the skin. As the polar bear’s skin is black, it is able to absorb light efficiently, and convert it into heat which it transfers to the body.

http://www.building4change.com/page.jsp?id=1339

External wall insulation system (EWIS) specialist Sto has brought its StoSolar solid wall heating system concept from Germany to the UK market.

The system incorporates a translucent glass render finish covering tiny capillaries that guide sunlight to a black absorbent layer, which converts solar to thermal energy. The masonry stores this heat and releases it back into the building as radiant heat, reducing the internal heating requirement.

Low sun means high heat

The amount of heat generated by the system depends on the angle of the sun. In summer, when the sun is high in the sky, less radiant energy is absorbed by the capillaries, so the heat generated is greatly reduced. In the winter, the low angle leads to the maximum amount of sunshine being transmitted to the absorbent layer ensuring that most heat is produced during the cold months.

StoSolar integrates into a Sto EWIS and is suitable for new and existing buildings when fixed to a solid wall that is not internally insulated. It will generally use 10-30 percent of a façade’s insulating surface area and be delivered to the construction site as prefabricated units to be incorporated into an external wall system.

Recycled Foamed Glass Insulation

28 May 2012 Update:

I put a post on greenbuildingforum.co.uk and the consistent reply is that it’s more expensive than well used and well know Leca, which is usually used with a breathable Limecrete floor. I’m not sure if it’d work / work as well under a non breathing floor.

http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=9113&page=1#Comment_147104


I was at a Green Building show / expo / day at the Eden Project last week and there was a talk by a German sounding chap, who is part of the UK Epoc Europe Ltd team promoting / pushing their TECHNOpor (Recycled Foamed Glass).

The key points seemed to be:

  • uses 100% (or close to 100%) recycled materials (glass bottles etc.)
  • German factory is powered by HEP electricity.
  • light to transport on low emmisions trucks from Germany.
  • easy to work with.
  • good insulation values for under the floor, behind retaining walls.
  • can even be used for between floor and in ceilings insulation (as super light).

I’ve found 2 UK Websites related to this:

The German site for TECHNOpor is http://www.technopor.com/English/Granulat/

The Swiss site has a great idea of using bags for when you use the Recycled Foam Glass to insulate a wall. Given that there will be 2 retaining walls, this could be great.

From www.misapor.ch:

Window Efficiency Article

Houzz have this US biased article on Energy-Efficient Windows: Understand the Parts

Window Frames

All have their advantages and disadvantages, but the U.S. Department of Energy (DOE) recommends vinyl, wood, fiberglass or composite. (Aluminum is easily heated, so it isn’t a great insulator.) Wood has efficiency problems due to expansion and contraction, so consider aluminum- or vinyl-clad windows. But if you choose vinyl, consider an insulated version, depending on your climate and house requirements.

Window elements from http://www.energysavers.gov/your_home/windows_doors_skylights/index.cfm/mytopic=13370

Window Glazing

Different gas fills impact cost and efficiency.

The most common gasses used are argon, which is relatively less expensive, and krypton, which is more expensive but has a better ability at decreasing a window’s U-factor.

Tints and inner glass layers or spectrally sensitive coatings can impact the U-Value.

Low-E coatings. These coatings increase a window’s cost by 10 to 15 percent, the DOE says, but they can reduce energy loss by about 30 to 50 percent.

For keeping heat inside the house in the winter, the coating should be on the inside of the glass.

 

Carbon negative bricks !

Carbon negative bricks showcased prior to market launch

From: http://www.building4change.com/page.jsp?id=1276

Encos uses recovered aggregates and vegetable oil to make sustainable bricks

Encos’ carbon negative bricks and brick slips are set to come to market soon and are on display this week at the Greenbuild Expo 2012 show, which takes place on 9 and 10 May in Manchester.

The bricks and brick slips are made from a combination of recovered aggregates and vegetable-oil-based binders. They are manufactured using a patented method based on research carried out at the department of civil engineering at the University of Leeds by Dr John Forth into the use of alternative binders in construction materials. The process consumes no water, and produces no waste.

Encobricks and Encoslips will be the first Encos products to come onto the market. Prototype products manufactured at the company’s pilot plant have been subjected to comprehensive testing at BRE and have met the standards for fire resistance, freeze-thaw and compressive strength. The products have already been used successfully in the construction of test walls.

Environmental impact

Encos says its bricks use 80 percent less energy to make than clay bricks, and as a result produce only 30 kg CO2e per ton of product. In addition, the plants that produce the vegetable oils used in the Encos binder take in CO2.For every ton of Encos product, 70 kg of CO2 is sequestered within the binder.

But looking at their site, these aren’t yet in commercial production 🙁

“A scale production plant is now fully designed with production planned for mid 2013.”
http://encosltd.com/products/production/

Saving energy and water :: Pipework

An interesting GreenBuildingForum.co.uk thread.

Long +/or copper pipes mean that the amount of water that needs to flow to a tap, before you have a hot tap can be a lot. Shorter plastic (that don’t absorb the heat, until they heat up) pipes will have a big impact on reducing the amount house users will run a tap in order to get their hot water needs / desires.

Also discussed is having thinner diameter pipework. If you have enough pressure, this means there is less water sitting in the pipes between times the hot water is requested. Suggestion is 12mm pipework.

Construction (embodied) Energy Vs Operational Energy

My Summary / Conclusion

  • In 2007, 16% of CO2 equiv impact is construction of a building, 84% is operational / in-use.
  • Today the split is roughly 20% embodied and 80% operational.
  • The modelling shows that we are moving to a CO2eq (CO2 equivalent) of 38/62% for masonry construction, and 35/65% for timber-frame construction.
  • No significant differences emerged between masonry and timber construction in terms of overall CO2 impact over the 60- and 120-year study periods. The largest difference observed between comparable masonry and timber constructions was 4%.
  • No clear / significant impact of thermal mass.
  • Emissions are cumulative, so 1 tonne of CO2 equiv at the point of construction roughly equals a tonne of CO2 equiv during the 60 year life of a building.

Which aspects of a dwelling are responsible for the largest CO2 impact?

  • Space and water heating have the largest CO2 impact in dwellings.
  • Appliances also have a large operational CO2 impact.
  • In both masonry and timber constructions, the impact of foundations and ground floors dominates the embodied CO2eq impact.
  • In masonry construction, the external walls also have a major impact.
  • Other elements, such as windows/doors and floor finishes, have a relatively large impact because they are repeatedly replaced throughout the life of the dwelling.
    • Waste water heat recovery systems have a 60 year assumed life span (windows and doors – 40, MVHR 15, flooring 10 ….)
  • The embodied impact of services was found to be approximately 5% of impact at 60 years and 7% at 120 years.

Construction Vs Operational Energy

I’ve come across some interesting figures and links to research in an article in the Green Building Magazine (by www.greenbuildingpress.co.uk).

  • Embodied Energy – a ticking time bomb (Spring 2012)

In 2007, around 16% of the CO2 equivalence impact was constructing a building.
– This covers the manufacture of materials and components, transport and construction.

84% of the CO2 equivalence impact of a building was down in use emissions.

This data is from http://www.bis.gov.uk/assets/biscore/business-sectors/docs/l/10-671-low-carbon-construction-igt-emerging-findings.pdf

That is why policy to date has been biased to making buildings more operationally efficient.

The article then makes the point that raises the importance of embodied (construction) emissions. Namely that since emissions are cumulative, 1 tonne of CO2 equivalence impact occurs for every year this “CO2” is in the atmosphere. So 1 tonne of CO2 at the start of a buildings 60 year life will have twice the impact of 1 tonne emitted during the building’s life.

The longer a tonne of CO2 hangs around in the atmosphere, the more damage it can do.

So it’s potentially dangerous to focus on carbon-intensive solutions that are installed at the point of construction, so that they reduce the operational emissions.

So, it is best to look for principles, materials, solutions etc. that will reduce both the construction (embodied) and operational energy of a building. So, as it’s often said, the general advice is still to optomise the fabric efficiency of a building before other measures.

October 2011 Update

The October 2011 report by the NHBC Foundation (“Housing Research in partnership with BRE Trust”) – Operational and embodied carbon in new build housing – A reappraisal:

Until now, focus has been almost entirely on the carbon emissions resulting from using homes, but clearly the balance between those operational carbon emissions and emissions from producing and installing the materials – the embodied carbon – needs to be considered.

This publication explores a subject which has to date lacked a strong and accessible evidence base. It looks at a range of carbon reduction scenarios as delivered through typical house types and estimates the likely impact both in terms of operational and embodied carbon – providing an insight into the contribution of different technical responses to the low carbon agenda, including the balance between operational and embodied carbon.

Evaluated Scenarios:

Twenty-four scenarios were appraised, using SAP software to determine operational CO2 emissions and BRE Global’s Environmental Profile methodology to analyse embodied CO2eq emissions.

The research considered the following variables:

  • two built forms (detached and mid-terraced)
  • two construction weights (masonry and timber frame)
  • three operational CO2 performance levels (25, 31 and 40% reductions over Part L1A 2010)
  • two dwelling lifespans (60- and 120-year study periods)
  • varying grid electricity CO2 intensity (to account for the expected impacts of grid decarbonisation).

Extracts from the report:

  • The modelling showed a typical percentage split between operational and embodied CO2eq (CO2 equivalent) of 62/38% for masonry construction, and 65/35% for timber-frame construction. These are averaged figures.
  • No significant differences emerged between masonry and timber construction in terms of overall CO2 impact over the 60- and 120-year study periods. The largest difference observed between comparable masonry and timber constructions was 4%.
  • The modelling showed that space and water heating, along with foundations, ground floors, windows/doors and floor coverings, were the largest contributors to overall lifetime CO2 impact. Appliances were also a significant contributor, but building designers have limited opportunity to reduce these emissions via their designs.
  • The typical split between operational and embodied CO2eq in new build housing has been taken as 80% operational, 20% embodied, a position largely confirmed by recent studies[1]. However, within the context of future Building Regulations requirements – which are expected to tighten to the point that new homes will be significantly lower in CO2 from 2016[2] – operational CO2 emissions are set to fall radically. This means that embodied CO2eq emissions will become increasingly significant in terms of the percentage they contribute to the overall CO2 impact of new build dwellings. In addition, typically the more energy efficient a given house type becomes, the greater the quantity of additional materials required to construct it (eg additional insulation, more services). There is also potential that such additional materials (eg renewable generation installations) may have particularly high embodied CO2eq levels. Both these considerations suggest that, as operational CO2 emissions reduce, embodied CO2eq emissions will increase.
  • The replacement of services and other building components has a direct bearing on both operational and embodied CO2eq emissions across the 60- and 120-year study periods.

Assumed lifespan of construction elements:

  • The proportion of embodied CO2eq in masonry construction was found to be higher than that in timber construction. However, this difference was relatively marginal, the maximum difference being 4%. This is because, other than the walls, the majority of building elements were similar in both the masonry and timber constructions modelled.

Which aspects of the dwelling are responsible for the largest CO2 impact?

  • Space and water heating have the largest CO2 impact in dwellings; this remains significant in all scenarios despite diminishing slightly as designs move from 25 to 40% CO2 reduction.
  • Appliances also have a large operational CO2 impact, although dwelling designers have limited ability to help achieve reductions in this area.
  • In both masonry and timber constructions, the impact of foundations and ground floors dominates the embodied CO2eq impact.
  • In masonry construction, the external walls also have a major impact.
  • Because both of these areas will last the lifetime of the dwelling, they should be considered at the design stage when seeking to reduce the overall dwelling CO2 impact.
  • Other elements, such as windows/doors and floor finishes, have a relatively large impact because they are repeatedly replaced throughout the life of the dwelling.
  • The embodied impact of services was found to be approximately 5% of impact at 60 years and 7% at 120 years. However, these results should be treated with caution as some aspects, such as controls, had to be omitted due to lack of available data, and the services were not studied in depth during this project.

Did the varying thermal mass levels have a significant impact on cooling?

  • No clear trend was identified from the modelling carried out, with minimal impact from space cooling in both masonry and timber designs.

Nice look & feel :: Fire, kitchen, stairs

Some nice ideas, look & feel vibe etc. from Houzz.

Nice enclosed fire, with fire side storage and seating:
Nice look and feel to kitchen and stairs:

Bamboo “wood” stairs:

Which could be on just the horizontal sections like for: