The item you need to fix your shed to a concrete slab is what we call a concrete fixing kit. Wondering how to anchor a shed? For example, if you plan to have your Arrow shed on a concrete foundation, you will probably want to invest in our concrete anchors. Concrete Fixing Kit. Customers primarily use the following heavy-duty, easy-to-install, and load-tested anchors to successfully secure sheds to the ground: 1. Any metal building should ideally be positioned so it does not sit in a naturally windy place, but, to be safe, it will still be necessary to give the shed an anchoring system. Penetrators (PE26 with brackets.) 3. For cabled anchors, you'll use a drive rod to drive the anchor … Concrete Anchors The best way to anchor a metal building is to set the four corners on concrete … Shed Anchors. Remember; always choose the best anchor … Arrowheads 2. You typically need one packet for a shed … Bullets. As such, you’ll want to choose the right anchor for your structure depending on your location and the ground material. They come as a packet of 8 ‘L’ Shaped brackets and dynabolts.