Background Image not displaying on iphone 4s-6plus

Hello,
I am building a site (idealconstructioninc.com) and have added an image to the background #home section. It displays properly for me on pc/mac laptop, but the image “disappears” on all iphones?
 
Below are a couple of coding attempts. The first is the current version on the site. I appreciate any help you may be able to provide.

#home { background: url('http://www.idealconstructioninc.com/wp-content/uploads/2015/02/bg_1.jpg') fixed no-repeat top center; }

#home {background: url('http://www.idealconstructioninc.com/wp-content/uploads/2015/02/bg_1.jpg') no-repeat 50% 50% fixed; background-size: cover; -moz-background-size: cover; -o-background-size: cover; -webkit-background-size: cover;}