im gonne have to disagree. ive worked construction all my life, until the past few years, im roughneck for an environmental drilling outfit now, very hard work. i've lost no wieght. its only when i throw cardio into the mix ill see results. however, this line of work often requires you to eat junk food, which may be part of the problem. i can literally eat anything i want to, with this job and ill never put on fat. a good diet combined with a blue collar job and you might see some results, id be scared of losing muscle tho. often heavy lifting is required, so losing muscle isnt a big problem, but id seriously watch your chest, as that muscle is nearly the only one never used at hard manual labor jobs.
bottom line, i dont think you should rule cardio out. its the only thing that put me over the top. but id also stick to the weights super heavy because all that excess calorie burning may cause you to lose un-needed muscle. and def bring your lunch to work if possible. ive about said fuck wendys and to hell with that shit, even though you're tired and starving after working hard and everyone is going to eat junk food, its definitely not worth it.