SQL 2012 :: Rollback Transaction In Nested Stored Procedure?

create proc proc1 (@param1 int)

as

begin try
declare @param2 int
begin transaction
exec proc2 @param2
commit transaction
end try
begin catch
if @@trancount > 0
rollback transaction
end catch

i haven't had an opportunity to do this before. I have nested stored proc and both inserts values into different tables. To maintain atomicity i want to be able to rollback everything if an error occurs in the inner or outer stored procedure.