Condensation within the structure of buildings is a lot more complex than condensation in a sweaty pub on a Friday night, writes building physics expert Toby Cambray.

The revelations in Passive House Plus issue 24 about failed external insulation retrofits in the Fishwick area of Preston have been followed up by UK national media, putting pressure on Ofgem, the electricity and gas regulator, to make more effort to help those affected.

The net effect of poor insulation levels, underheating and under-ventilation in buildings poses a major public health threat. Peter Rickaby describes one pioneering London project that’s taking a practical, methodical – and scalable – approach to solving the problem.

A disastrous failed external insulation contract run under a government energy saving scheme has affected up to 390 homes in Preston with water penetration, mould and damp.

Despite increasing standards of insulation and airtightness, housing developers face few requirements to provide better ventilation and indoor air quality for new home buyers — beyond knocking extra holes in walls. But as reports of condensation and mould affecting new housing developments continue to surface in both the UK and Ireland, and research indicates many new homes may have poor indoor air quality, are developers finally waking up to the need for properly engineered ventilation systems?

Questions have been raised about ventilation standards under the government’s new Warmth & Wellbeing scheme, which provides free energy efficiency upgrades to people over the age of 55 living in Dublin 12 and 24, who experience energy poverty and are also suffering from respiratory conditions.

In this first instalment of his brand new ‘Help Desk’ feature, architect and passive house designer Simon McGuinness of Dublin Institute of Technology invites questions on all aspects of passive house, retrofit and low energy building.

The primary reason for requiring airtightness in buildings has nothing to do with energy efficiency or occupant comfort, writes Helen Brown, head of building physics at Encraft — it's for the protection of the building fabric. 

Smet Building Products, the agents for leading German manufacturer Casea, has introduced the latest in internal moisture regulating plasters: Casea Casucalc Klima and Casea Klimafeinputz KFP breathable fine finishing plaster.

Low energy building isn’t complicated, but it’s easy to get wrong. Since Irish house builders downed tools en masse when the last boom ended, energy efficiency standards for new homes have seen unprecedented rises of 40% in 2008 and 60% in 2011, shooting far ahead of the UK. But with signs of a new boom emerging, can the industry get to grips with this brave new world of insulation, airtightness and thermal bridging and deliver healthy low-energy homes — or are damp and mould set to become the norm in new build?

The Building Life Consultancy and Fraunhofer Institute for Building Physics are providing a two-day Wufi Pro training workshop in Dublin on 14-15 December.

This is only the third English language workshop of its kind to be offered in Europe according to the Building Life Consultancy, and will train members of the construction industry to use Fraunhofer’s Wufi Pro software for hygrothermal (heat and moisture) simulations of building fabric.

In the fourth part of a series of articles on the condensation risks associated with insulating single lead dwellings, Joseph Little of Joseph Little Architects & Building Life Consultancy reveals serious problems with the approach taken by regulators, standards authorities and suppliers on the condensation risks associated with insulating single leaf walls.