Passivhaus Consultant and Designer, Bristol.  Very Low Energy Buildings.  Domestic and non-domestic.  New build and refurbishment. 

07502 425158

Bristol, UK



International Panel Products Association Symposium

Piers has been invited and have agreed to speak at the Internation Panel Products Symposium in Llandudno in on 12/13 October on carbon sequestration by building materials.  This follows on from his MSc Dissertation and subsequent work funded by DECC and the ASBP.


Green Deal news

Yet again bad news on the Green Deal (  No one has actually implemented measures under the scheme - that's Zero houses upgraded since the scheme started.  The reaosns:

- flawed ideas about the economics (see my previous comment on Green Deal finances and graph to the right showing Golden Rule not met). 

- high interest rates

- the mechanism for the loan which attaches the repayments to your electricity bill.

This was all entirely predictable.  Perhaps the government will start listening now.

The only positive element is that money is being pumped into refurbishment through the ECO (Energy Company Obligation).  Most of this money is being spent on social housing, but it is also aimed at tackling fuel poverty in the wider housing stock and difficult to treat housing.  The ECO needs to be joined up seemlessly with the Green Deal as a top up funding stream that makes the economics attractive.  Combine this with lower interest rates and a simpler loan scheme and perhaps it will gain some traction. Perhaps in time energy efficiency measures will become cheaper and fuel prices will go up and eventually the top up funding won't be needed, but that's not where we are now.


Carbon sequestration by buildings

The Alliance for Sustainable Building Products (ASBP) have recently been publicising work we did for them last year where we estimated the potential for sequestering CO2 in the UK building stock.  We estimated that up to 22MtCO2 per year could be sequestered by 2050 if policy was directed towards use of biogenic materials.  Follow link for sequestered carbon report.

ASBP have discussed the figure with DECC who are interested in the clear potential of carbon sequestration by buildings.



Could this be about to become the lowest energy home in Bristol?

We hope so.  We'd be interested to hear from other candidate homes.

This project is the complete energy refurbishment of a 1930s detached house.  

The refurbishment works design was led by Piers Sadler Consulting working alongside S2 Design Architects.  The house belongs to Jenny and Ceri Richards and their two children. 

The refurbishment is based on Passivhaus principles with high levels of insulation (U values <0.15W/m2K), thermally bridge free construction, airtight detailing and mechanical ventilation with heat recovery (MVHR) and Internorm triple glazed windows.  The space heating and hot water will be provided by a small gas boiler with weather compensation controls.

Key details were modelled for thermal bridging using THERM software to ensure that the treatment of thermal bridging was acceptable and the whole design was modelled using the Passivhaius spreadsheet PHPP. 

Due to orientation, espcially the large areas of north facing windows, the designs don't quite meet the Passivhaus refurbishment standard 'EnerPHit'.  The annual space heating energy usage calculated using PHPP was 34kWhr/m2/yr.  The airtightness test is yet to be done.

Construction work began in February 2013 being undertaken by Woodgate Builders.  

The photo shows the Intello+ airtightness membrane and vapour check below the joists with Kingspan K5 insulation between.  The membrane will be taped at all joints.  A further 100mm of K5 will go above the joists/rafters and 120mm of K5 external wall insulation will be applied.  

Attention to detail is critical to meet the project aims.



Expert Witness Groundwater Pollution

Piers was appointed in April 2013 to act as an expert witness for the defendant in criminal proceedings involving alleged sewage pollution of surface water and groundwater funded by legal aid.  The site is complex with several potential sources of pollution.  The work involved detailed scrutiny of evidence and witness statements produced by the Environment Agency and drafting of an expert witness statement.  The case continues.