National plan for increasing the number of nearly zero-energy buildings as required by Directive 2010/31/EU on the Energy Performance of Buildings (EPBD recast) - Bulgaria

Article 2 of the EPBD recast defines a nearly zero-energy building as “a building that has a very high energy performance, as determined in accordance with Annex I [of the Directive]. The nearly zero or very low amount of energy required should be covered to a very significant extent by energy from renewable sources, including energy from renewable sources produced on-site or nearby”.

Air Permeability of Building Board Material

This presentation discusses the air permeability of building board materials used in the airtight layer of timber structures. The laboratory test was performed of different samples: plasterboard, oriented strand board, cross laminated timber and surface coating participle board. The methodology of this laboratory test is described in the standard STN EN 12114. The significance of this work consists in determining values of air permeability of different building board materials. The plasterboard and cross laminated timber samples met requirement of air permeability q50< 0.1 m3/ (m2.h).

UK draught proofing guide

Which?, a UK website for testing household products and more, has developed a draught proofing guide that includes varied information such as:

  • What is draught proofing?
  • Draught proofing costs and savings
  • How to draught proof your house
  • Draught proofing sash windows
  • Stop draught with a draught excluder
  • Draught proof your loft hatch
  • Protect pipework from draughts
  • Other draught trouble spots


The 35th AIVC conference : 'Ventilation and airtightness in transforming the building stock to high performance' - Call for abstracts deadline 15 March 2014

A second announcement has been made for the 35th AIVC conference : 'Ventilation and airtightness in transforming the building stock to high performance' which takes place in Poznań, Poland together with the 4th TightVent and the 2nd venticool conferences September 24-25, 2014.

Important dates:


  • Abstract Submission Deadline: 15 March 2014


  • Confirmation of acceptance: 1 May 2014


  • Submission of papers: 30 June 2014


Overview of 2012-2013 webinars on building and ductwork airtightness

An overview of the TightVent - AIVC- Air Infiltration and Ventilation Centre webinars held in 2012-2013 on building and ductwork airtightness.


  • Airtightness testing: Status and trends in competent tester schemes in the UK, Belgium, Germany, the Czech Republic and France


  • Building Airtightness Solutions


  • BUILD UP webinar: Building and Ductwork Airtightness: Legislative Drivers, New Concerns and New Approaches


  • The need for structured air leakage databases


34th AIVC conference, 2013 - Summary of the airtightness track

Over 160 people attended the joint 34th AIVC, 3rd TightVent, 1st venticool and 2nd Cool Roofs Conference held in Athens, Greece on 25-26 September, 2013. The conference focused on research, technologies, policies and market transformation which optimally employ proper mitigation and adaptation techniques with the aim to reduce the energy consumption of buildings and improve the urban microclimate.