The Judge, Mr Philip Richards, said the fire was a "very irresponsible act" with "consequences that were devastating". He acknowledged that Mr Goulding has considerable learning difficulties which is why he took so long to accept responsibility.
Mr Goulding has been remanded in custody and will be sentenced tomorrow at 2pm at Newport Crown Court.
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It will be played in May.
When Keith Llowarch from Flintshire had a heart attack, paramedics had to shock him 14 times with a defibrillator.
A bitterly cold and frosty start to the day but it will stay fine and dry with plenty of sunshine!