They can be mounted directly to the hot and cold connections on the back of washer or to the hot and cold water shut offs for the washer. We recommend they be mounted to the hot and cold shut offs for more stability.
The floor sink could be located in the middle of a floor or under a fixture. In either location; a full grate could be used to allow water to flow freely into the drain and help stop garbage from entering the drain and creating a blockage. The full grate will also allow for general foot traffic without tripping hazards. When under a fixture, you may have one or more drains draining into the floor sink. This is where the half and three quarter grates are used to accommodate an opening necessary to receive the incoming drain pipes, while providing some protection against garbage flowing into the floor sink.  
The floor sink is generally installed in light duty commercial applications, kitchens and mechanical rooms. They are not designed for areas where heavy weight loads could be applied on top of the grates, garages or loading docks. 
The roof drain should always be set onto the base of the roof structure unless otherwise specified by a roofing materials manufacture or project engineer. After the drain is secured into place using the Underdeck Clamp Kit, the roof would then be flashed (waterproofed). The insulation, other roofing materials and finishes are set into place according to the roofing materials manufacturer or the project engineer. 
Oatey offers a #47700 Underdeck Clamp Kit that is recommended for every roof drain installation. This clamp is placed below the roof and attached to the drain body with 4 pieces of threaded rod, and 4 nuts. Once installed the clamp will secure the drain body in place so that the waterproofing seal is less likely to be compromised. 
No. Waterproofing materials can only be applied in series with our flanged drain assemblies. Please visit our website to select the right drain for your project. 
Yes
Outside diameter   29¾” x 31¾” Inside diameter   27-11/32” x 29-11/32” Depth   2-19/32”   
Yes. The #34169 – 28”x30” pan does not have ribs.
No. It is very unlikely that you would be able to create a watertight patch, and this would void any manufactures warranties. If you need a pan without holes for your application, we offer several pans for you to choose from: 22” Plastic Pans #34066 do not have holes stamped into them. Aluminum Pans are available without holes in all sizes.