Spray Foam Insulation (Home)

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Has anyone used the spray foam insulation to retrofit insulation to existing walls? I have a Florida room that dosn't have insulation at all - I'm in the process of closing up a window (goes from bedroom into Florida room... I'm guessing the Florida room was added on after the addition that the bedroom was in. Wasn't a bedroom at the time either, I think... I'm thinking of calling it the "lego house"... Ahhh the joys of remodelling)

Since I will have part of the wall off, I want to put some insulation in. The boards (wall of the Florida room) are at a diagonal so I'll have a large chunk of the wall off. There's also no existing vapor barrior, so I'm set on foam.

Thanks,
-V