We used the spray in soya bean insulation in between my rafters in a new build. The house heated up almost instantly. All my "professionals" on the job - engineer, architect, including many builders that think forward, not backwards - swear by it.
Haven't moved into the house yet but it certainly gives me a warm cosy feeling even to look at it in every nook and cranny in my roof.
We used guys from South Kilkenny.