sealing the box, as they cannot completely fill all voids or seal the interface between the insulation and the building structure. Nor can they cope with small structural movements which will often lead to air gaps, particularly in difficult to treat situations where access is poor and when voids are of complex geometry. Jim Shearer of JSJ Foam Insulation takes

up the story. “Icynene is nothing like the urethane foams of 20 years ago. Icynene uses water as the blowing agent so the reaction

between the two components produces C02 which makes the foam expand.” He continued, “We sprayed Icynene

directly onto the blockwork and over the concealed sections of cladding framework. We had free access to the existing scaffolding platforms so the spraying process was quick and straightforward. We had job done in under a week.” Said Mr Shearer.

Open or closed cell composition

Spray foam insulation can be either open or closed cell in composition. Open cell is extremely vapour open and will allow moisture vapour to pass freely through it allowing the building to breathe naturally. For the Dumfries Baptist Church project,

Icynene MDC-200 HFO, a closed cell foam that uses Hydro-Flouro Olovine [HFO] as a blowing agent, was used. HFO is an environmentally friendly material which has a Global Warming Potential [GWP] of only two and an Ozone depletion rating of zero.

McLean Architects designed an 18.00 x 18.00msq 8.00m high sports hall structure comprising an internal leaf of concrete blockwork with an insulated external steel frame with fibre-cement rain- screen cladding.

Closed cell foams tend to be much less

vapour permeable than open cell and are considerably more rigid and hard. They resist the passage of liquid water and are ideal for use in conjunction with the rain-screen

cladding system specified. Closed cell foams also have a greater thermal resistance than open cell foams.

Cost efficient solution

Icynene MDC-200 foam insulation was applied to the entire outer leaf of the games hall, an area of approximately 550sqm and to a thickness of 150mm. The work was completed over a four-day period. According to Icynene, spray applied insulation is broadly comparable in cost to conventional fibre based and rigid board type insulation materials however, its speed of installation, minimal waste and its ability to perform in difficult to treat applications means spray foam can be an extremely cost-effective solution for a variety of projects up to and including those built to Passivhaus standards. Construction of the Baptist Church buildings began in early 2017 and is scheduled for completion by Easter, 2018. Icynene provides a 25-year warranty for all

its insulation products and as well as carrying EST Approval, Icynene Foamlite is also BBA Certified. For more information on Icynene Spray

The 2000sqm, multi-purpose complex is due for completion in early 2018. Image courtesy of McLean Architects. Glasgow

Applied Insulation products visit the website.



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