Use this for upper quartz slab:
/fill 1001 112 -940 986 112 -973 minecraft:stone_slab 15
I've been reading about a lot of people who have had troubles with new players coming in and destroying all of their hard work. I've experienced this myself, many a time. I've come up with a few tips to help new players go through the hurdle.
#1. Turn Trust Players Off.
You can manually do this from the main menu. Turning this off makes it so no new player can come in and start doing whatever they please. They will have access to nothing. You can give them these features by pressing minus and selecting their name, in game. Only do this if you feel you can trust them. I personally have set up a Server Rules wall near spawn point, letting them all know what's up. If I see them reading it, I know they can probably be trusted. More often than not, they will skip the signs and start begging for perms. Even when I tell them to read the signs, they ignore, and continue to beg. These are amateurs, and you can throw them out.
#2. Make a Server Rules Wall.
I've set up a wall at spawn point and in the Town Market, letting new players know what's up. No stealing, griefing, destroying, building on or near other property. No visiting houses and browsing caches. And read every sign and follow it. Pretty simple. Only half of the people who've come in follow these rules, and so only half have stayed.
#3. Set up a dedicated Skype, Discord, Twitch, etc. Chat for people you trust to get to know them better.
Chat makes it so much easier to get along and to plan adventures together. Out of the 25 or so people that have joined mine, only 1 ended up not being "trustworthy", and that's because he mistook what a sign said. Having people join the chat as a requirement to stay, or even before you accept their friend request, may make it so you never have to deal with griefers again.
#4. Create a backup save.
You can copy your game save. Did you know that? Do that before logging in, each time, erasing the old one, in case a few a-holes get in by accident. Go to the Main Menu and go to your game. Press X or Y and select copy. Bam.
#5. Always turn off "Allow friends of friends."
Letting people you don't know into your game is asking for a bad time. You can deselect this option in the main menu before logging into your server.
#6. Trial and Error.
Unless you force everyone to be invited to your group chat, or set up some sort of interview before accepting them, you will have a few nasties come into your game. These steps will help you minimize the casualties. Just remember to use all the steps for maximum safety.
Do you have a suggestion? Leave it below.
The server has gotten pretty full, but I'm always willing to recruit a few more people when can play during downtime. We've had a lot of griefers and thieves lately, so I'm weary of new blood. Prove yourself a good player, and we'll trust you. Adding yourself to our Skype chat will also help us trust you more.
any word on an update?
How soon is ASAP?
In case folks are wondering, yes I'll be updating Jolicraft for MC 1.9 ASAP. Stay tuned