West Beacon Farm, near Loughborough, demonstrates what can be done with external insulation. This 1950s house - originally built with almost no insulation - has been insulated with Straw bale external wall cladding, and render.
Even when the roof won't fit exactly over the insulation, a special flashing can be used to deflect rain. There is a detailed PDF about the project.
Insulation design is by Jerry Tseng of Pick Everard.
Photos from the PDF document.
Good quality foam is dependent upon one-to-one ratio dispensing. The easiest way to determine that you have good ratio is to observe the stream of chemicals coming out of the gun before they pass through the mixing nozzle.
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