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ICF Homes


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ICF Construction - Myrtle Beach, Pawleys Island, Surfside Beach, Litchfield


What is ICF

Insulating concrete formwork (ICF) otherwise known as permanently insulated formwork (PIF) is an insulated in-situ concrete system of building that is quick to construct and offers levels of performance significantly better than that available from slower, more traditional approaches to building. Popular in Germany where it was born in the early 50's, it is grown rapidly in North America starting as a basement construction and now has approximately 8% share of the low rise housing market in Canada and the USA.  It has been growing in the UK self-build sector for some years with a performance far in excess of the Building Regulations but with the recent increases in performance demanded by Building Regulations, Eco-homes  and now the Code for Sustainable Homes it is broadening into mainstream and is currently on trial with a number of UK housing associations and regional house builders. It is one of just four approved walling systems for domestic basements see www.basements.org.uk . It is recognised as an MMC system (Modern Method of Construction) by the BRE (Building Research Establishment. www.bre.co.uk , English Partnerships www.englishpartnerships.co.uk and Communities England www.dta.org.uk

ICF is based on hollow lightweight block components that lock together without intermediate bedding materials, such as mortar, to provide a formwork system into which concrete is poured. The block is formed of sheets of insulation materials normally expanded polystyrene tied together with plastic or steel ties or an integral web of the same insulation. The later is manufactured as a complete block whereas the forms with ties are formed from sheet material. Some systems are delivered complete and some with ties which are clipped together on site to make the 'forms'. These latter have the panels delivered flat packed. Some of the systems which are complete with hinged ties are also delivered flatpacked.

Fresh concrete is poured into the forms built up to 3 metre high as a complete wall. This is normally dome by pump. Once the green concrete wall is set, it becomes a high strength concrete frame structure with the formwork remains in place as thermal insulation, providing u-values ranging from the standard 0.30 w/m²k as required by the current Building Regulations down to 0.11 w/m²k - ideal for zero energy buildings Star Level 6 in the Code for Sustainable Homes. The building process is quick, tidy and precise, with lower equipment requirements than alternative methods and only semi-skilled labour.

Creative design (without compromising performance) is encouraged by the availability of a comprehensive range of components, further enhanced by the option to incorporate reinforcement for basements or multi-storey projects. The highly insulated structure may be clad internally and externally with a wide range of finishes, including plaster, masonry, curtain walling and renders. Most of the systems are marked on the outer faces of the forms to indicate where positive screw fixing can be made with self tapping screws into plastic or metallic webs.

There are several different designs of ICFs world-wide.  ICFs are usually made of insulting foam, such as EPS (expanded polystyrene), and are manufactured either separate panels that are connected with plastic connectors or ties or preformed inter-locking forms or galvanised steel ties in preformed inter-locking forms.

The differing insulating concrete formwork systems cause variations in the shape of the concrete within the wall:

  • "Flat" systems (3rd generation) form even thickness concrete throughout the wall area similar to a conventional in-situ concrete wall. In areas where there are high seismic or severe weather conditions, flat wall systems predominate as the system of choice.
  • "Waffle Grid" systems (2nd generation) form create a waffle pattern were the concrete is thicker at some points than others.
  • "Post & Beam" or "screen grid" systems (1st generation) form discrete horizontal and vertical columns of concrete.  The areas within the grid are solid insulation, increasing the overall U-value but offering reduced fire resistance.

 

 

 

Click on the PLAY button below to see some of the Construction Process that goes in to building an ICF home

 


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