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News analysis Regulations
effort has been placed on analysing on limits of design flexibility for
the financial implications of the new build and standards of energy Question marks remain over
proposed changes, and trying efficiency for replacements, and
Part F ventilation proposals
to predict which sectors of the include improved standards for the
market are going to grow, which Dix services contained in the previous As buildings become more air has been in contact with a piece
describes as a “tricky business”. guides and be updated in line with tight, they begin to reach assumed of paper. Someone needs to sign
As regards the removal of the BS ENs. levels of permeability used in the a certificate that this has all been
consequential improvements issue, Part L 2010 also looks more calculation required in legislation. done, and there needs to be real
Dix says that the “reasoning and closely at compliance, with a This is an issue in domestic sanction if they lie.”
direction” that goes into Part F number of options explored by dwellings rather than non- He also has concerns about
and L needs to respect European DCLG, including improving the domestic buildings, which is the proposal to make all domestic
legislation. The EPB directive is connection between the National driving a trend towards mechanical ventilation systems meet
currently being redrafted. Calculation Method (NCM) ventilation in homes, away from Requirement F1. In the revised
The published consultation calculation inputs and information natural ventilation. building regulations it states: “Only
document also shows that DCLG on construction. A two-stage Of the main changes the provision (which includes
wants to keep the same regulatory calculation has been created, one proposed in Part F of the Building replacement) or alteration of
and compliance framework as for on design, one on completion, with Regulations 2000, Hywel Davies, continuously running mechanical
Part L 2006. information available to the builder technical director at CIBSE, has systems will be notifiable building
and building control so they can welcomed the inspections of both work.” Davies says: “Fine in theory,
Timetable focus on these areas. natural and mechanical ventilation but in practice? I don’t see any
The timetable for Part L 2010 also DCLG also wants Part L 2010 systems, but stresses it will need evidence of additional resources
remains. From that date, new to adopt Accredited Construction enforcing. He is also very much for building control to really make
homes will have to show a 25 Details (ACDs) with enhanced in favour of air flow rates being this happen.”
per cent improvement in energy quality control for higher measured on-site as part of the The ‘unintended consequences’
efficiency for a Code for Sustainable performance, the wider use of commissioning process, but of a new proposal to create design
Homes (CSH) Level 3 dwelling. The Competent Persons Schemes and believes this proposal may provoke air permeability tighter than or
target for a Level 4 home is a 44 per self-certification schemes, and more “serious pushback” from some in equal to 5 m3/(h.m2) at 50 Pa in
cent improvement from 2013, and a focussed guidance for renovation the industry. homes needs thinking through
Level 6 home should be zero carbon work. In addition, DCLG is looking However, he is sceptical of using too, as does the new criterion for
by 2016. to set performance standards for continuously running ventilation infiltration allowance for leakier
However, targets have also been people to comply with, as well as systems in homes. “If installed homes, which is now the same
set for non-domestic dwellings, with introducing substantial training in rented housing they’d better for single-storey and multi-storey
an ambition for all new builds to and a dissemination campaign so be totally tamper proof, with dwellings, according to Davies.
be zero carbon by 2019 – except for people know and understand the automatic controls that make sure But the suggestion of having
new schools and public buildings, requirements of Part L. that they run when required.” a new appendix which gives
which will have to be zero carbon in FETA (Federation of Davies has also suggested guidance on specifying and
2016 and 2018 respectively. Environmental Trade Associations), that owner/occupiers of homes assessing noise levels from
DCLG also intends to widen the body representing be given domestic log books to continuously running mechanical
its range of compliance guides to manufacturers, suppliers, help them operate the ventilation ventilation systems is nonsensical,
cover all building services, including installers and contractors in the system and inform them of the according to Davies.
lighting, ventilation, pumps and low building services industry, is now maintenance requirements – a step He says: “An appendix to an
or zero carbon technologies. These concentrating on feeding relevant further than the new proposals for approved document is guidance,
will set minimum standards for new information out to its members Part F 2010 go. and saying that manufacturers
and replacement technologies and to digest before holding a series But the DCLG’s idea of using should do things in there is too
will be available for new domestic of meetings in July and August. a checklist as evidence that the weak. If these components need
and non-domestic projects. They During these meetings, member new ventilation proposals for to be tested, then DCLG need to
will also be generic so they can be companies will be able to share their domestic dwellings have been require that, not suggest it would
adapted for use in all regions of interpretations of the documents completed isn’t enough: “A be a good idea in an appendix to a
the UK. and collect views ahead of the checklist is evidence that a pen guidance document.”
They will focus, in particular, September deadline. l
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also www. July 2009 CIBSE Journal 17
CIBSEjul09 pp14-17 newsanalysis.indd 17 25/6/09 15:44:54
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