Previously i have a post about using Bootstrap 3 theme in Drupal 7.
If the website you are building needs IE 8 support, a few hacks has to been done. Please note that using CDN to serve the Bootstrap source files will not work in this case. So you have to use method 1 to serve the Bootstrap source files locally when installing the Bootstrap 3 theme in Drupal as stated here.
1. Copy the system/html.tpl.php from the Bootstrap 3 base theme to your subtheme templates folder.
2. Replace the
<!-- HTML5 element support for IE6-8 --> <!--[if lt IE 9]> <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script> <![endif]-->
<!-- HTML5 element support for IE6-8 --> <!--[if lt IE 9]> <script src="/sites/all/themes/street/bootstrap/assets/js/html5shiv.min.js"></script> <script src="/sites/all/themes/street/bootstrap/assets/js/respond.min.js"></script> <![endif]-->
3. Add the following meta
<meta http-equiv="X-UA-Compatible" content="IE=edge">