Doing the measuring and taking all calculations into account, going to your local hardware store, trying to find the right material that you actually need, then coming home and assembling it, can cost you upwards of $50-$80 including your time (opportunity cost). And we all know those DIY projects always take more than one trip to the local hardware store. How much is you time and energy really worth? The Garage Shield installs in seconds and is available for only $19.95.