Back in November I wanted to put something over the iron septic cover to make it easier to get to when service is needed, and to have my small fire pit placed on it. I could not find anything that was 26" to cover the opening and lid. I recall
@serviceguy looking as well and never got around to posting what I did.
HomeDepot items are as follows:
Hot water heater pan, (cover the drain hole with duct tape or similar and use as the form) about $12
This water heater drain pan is made from crack-resistant, injection-molded polypropylene for increased strength and durability. Use this pan under a water heater to prevent damage from water heater leaks
www.homedepot.com
Sakrete 50 lbs bag (2 of them) about $12
Get the concrete you need quickly with this fast-set concrete mix. Great for walkways, driveways and ramps, you can set posts or concrete slabs over 2 in. thick. It sets in only 30 minutes, allowing foot
www.homedepot.com
Rebar, (2 of them tied in "X" with zip ties ) about $8
Weyerhaeuser 1/2 in. x 2 ft. Rebar is made of an unfinished-steel material and is suitable for use in forming stakes for gardens, tents and sprinkler heads. It can also be used for connector ties and concrete projects.
www.homedepot.com
I made two of the 50 lb concrete discs because it is easier for me to pick up and place two 50 lb pieces than one 100 lb piece. 50 lb mix and gallon of water makes it about 1.75 inches thick. The height is where I wanted it to be but even one disc would have been enough.