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These foams were always controversial for many reasons but the fire regs seem to have killed off the uk installers. May still be ok for outbuildings but worth a google to see the arguments for/against.
After posting this, I found a number of GBF threads touching upon this subject, e.g. http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=3341
And there seems to be a range of different products, open-cell or closed cell, those that use water as a blowing agent, and those that use other chemical agents as a blowing agent, and so on.
Quite frankly, there seems to be some confusion about whether these products (or which classes of products) contravene the Building Regs fire test requirements.
Here are some details regarding Icynene, a water-blown open cell product:
From the following document http://airsealinsulation.co.uk/site/files/BBA.pdf
7 Behaviour in relation to fire
7.1 The product is combustible and must be protected from naked flames and other ignition sources during and after installation.
7.2 The product achieved a rating of B-s1, d0 when tested to BS EN 13823 : 2002 in a construction consisting of timber boxes 100 mm deep, filled with spray-applied ICYNENE LD-C-50 foam and faced with 12 mm thick, gypsum plasterboard Class A2 and density 800 ± 100 kg·m–3.
7.3 Once installed, except for the unoccupied loft application and the suspended timber floor application, the product must be contained by a suitable lining board, eg 12.5 mm plasterboard, with joints fully sealed and supported by rafters, battens or studs. Therefore, the product will not contribute to the development stages of a fire.
7.4 Elements must incorporate cavity barriers at edges, around openings and at junctions with fire-resisting elements, and the maximum dimensions of any cavity in any direction must not exceed 10 m in accordance with the relevant provisions of the national Building Regulations. The design and installation of cavity barriers must take into account any anticipated differential movement.
External timber frame walls
7.5 The product can be added to the void between studwork, or used as a substitute for glass mineral wool or combustible insulation material, in any loadbearing, timber-framed inner leaf to a double leaf wall system providing that: • the outer leaf is masonry, and • the existing inner leaf system has been shown to satisfy the loadbearing capacity performance criterion of BS 476-21 : 1987 or BS EN 1365-1 : 1999 for the required fire resistance period.
7.6 The suitability of constructions other than those described in section 7.5 should be demonstrated by an appropriate test or assessment.
Roofs
7.7 The use of the product in a tiled pitched roof will not affect it’s external rating when evaluated by assessment or test to BS 476-3 : 2004.
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