Overriding the Outdated Foundation GridFramework

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Hi, i'm working on a project using Foundation 6 XYGrid, but the built in grid framework in Concrete5.8 use the old float. I looked around and can't get it to see my override, what am I doing wrong?

Thanks in advance.

path is: application/src/Concrete/Page/Theme/GridFramework/Type/Foundation.php

and using the following details in the file, I expected it to just replace the core one.

namespace Application\Concrete\Page\Theme\GridFramework\Type;
use Concrete\Core\Page\Theme\GridFramework\GridFramework;
class Foundation extends GridFramework
{

BHWW