[CentOS] How to Retain Ownership on webdir

Hi,

I have this webroot /webdir/ with 2775 permission so that any created file/directory by apache inside of /webdir/ will be 'users:webusers'. However, I noticed when the apache created a new files (fileB) / directories (dirB), the ownership becomes 'apache:apache' and the sgid has gone for /webdir/ (drwxrwxr-x). I'm currently using Wordpress.

[before] drwxrwsr-x users webusers /webdir/ drwxrwsr-x users webusers /webdir/dirA -rw-rw-r-- users webusers /webdir/fileA

[after] drwxrwxr-x users webusers /webdir/ drwxrwxr-x apache apache /webdir/dirB -rw-rw-r-- apache apache /webdir/fileB

Why the sgid bit doesn't reflected and the group as well? Has anyone knows how to fix this?

Thanks.

Regards, James