Concrete

[kyrv37]

On my 2004 Four Winds Class A Motorhome 32R with Gross Vehicle Weight at 22,000#, would a concrete slab 4" thick be ok? Planning on having a slab 20' X 36' X 4" thick concrete with a carport over it (18'X35'X13' Tall).

Thank's

[CampDaven]

If the base is compacted stone topped with washed sand, and has wire mesh and 3/8 inch rebar, you should be okay. Make sure the concrete is a heavy mix.

[Skip426]

Your concrete supplier/ finisher, would be the best to ask . Different formulas of concrete , re-bar size, a lot of variables . JMHO. Based on what went into the floor of my last home 6" min. BUT, I am not an expert.

[kyrv37]

I might Just go with rock. Sounds like it is starting to get pretty $$$. Now what is the best rocks to use for this?

[So Cal Roo]

I've done a lot of research on this as I'm going to have a new driveway put in the first of April. Don't ever expect to own a DP rig, our present rig is a Winnebago Vista 35F weighing in at about 22k. With that said here's my specs to replace a driveway built in 1939, pretty bad bad shape after four coaches.

2" compacted crushed base with sand
6" 3500 psi concrete, mix should be dry, not to much water. Note: if we were to buy a DP rig I'd go with 4000 psi concrete.
3/8" rebar set at 18" on center

I had six concrete contractors give me bids. After doing background checks (current license and workmen comp up to date and in order). I went with the middle of the quote range. First thing I ask when they arrive here is: do you have your own equipment? The company I chose has it all. He actually went back to his truck to bring me a picture book of his company yard. Also he'd done a few RV driveways.

[Skip426]

You will need some form of ground cover , under the rock that won't rip to prevent the weight from pushing any rock you put down into the earth.
Smaller rock 3/8" is easier to level out and won't roll out from under the tires as easily as larger stones. Talk to a supply company as per depth required and ground cover , edging to keep stones out of the grass. Both routes , concrete and gravel , done properly will be $$.

[vsheetz]

Size the slab for a next coach. Whether yours or the next owner of the property.

[kyrv37]

Originally Posted by So Cal Roo

2" compacted crushed base with sand
6" 3500 psi concrete, mix should be dry, not to much water. Note: if we were to buy a DP rig I'd go with 4000 psi concrete.
3/8" rebar set at 18" on center.

3/8" rebar set at 18" for both or only if you were going with a DP?

[Razzman]

I needed a nice firm base to park the 37' DP on. I leveled an area two feet wider than i was planning on using all they way around. Layered 4" of road base on top from the local gravel yard. Leveled by eye and drove the pickup over a dozen times or so to pack it and watered the whole mess down. Almost two years later it's still perfectly level, the road base packed down to a very hard base, doesn't push out per se and the levelors barely make a mark in it. And the total cost? $400, lot's of shoveling and a BBQ to feed some friends. You don't have to have concrete, tons of sand or 6+ inches of material to sufficiently support it, some will say you do.

[vsheetz]

Originally Posted by Razzman

I needed a nice firm base to park the 37' DP on. I leveled an area two feet wider than i was planning on using all they way around. Layered 4" of road base on top from the local gravel yard. Leveled by eye and drove the pickup over a dozen times or so to pack it and watered the whole mess down. Almost two years later it's still perfectly level, the road base packed down to a very hard base, doesn't push out per se and the levelors barely make a mark in it. And the total cost? $400, lot's of shoveling and a BBQ to feed some friends. You don't have to have concrete, tons of sand or 6+ inches of material to sufficiently support it, some will say you do.

Agree. I have a compacted DG long driveway and RV park pad. Had been in place for several years. Thousands of $$ cheaper than concrete.

[chuckinthebus]

Contact a local concrete company. They have people who can figure your PSI needed for the weight you want to support and maybe advise you on best preparation before concrete is placed. Depending on your location prep work will very if on bedrock or in sand like FL. Always have an option available should your MH size expand and check local building codes and tax laws. When in doubt, have contractors bid on it for what you want to do. If this is something you are not comfortable in doing, it may be worth the extra money to not have a multi thousand dollar rock in your yard. jmo Good luck.

[mahon1993]

Make sure you do it right the first time. It would cost a lot more to tear it out and do it over. You will never regret spending the extra money to do it right. But you will regret having to redo it a second time. Concrete is like that.

[kyrv37]

Wow, getting some great advice. Appreciate it. Thinking of going with the 4"road base. Guess I really do not need concrete. Just want it good a level.

[chuckinthebus]

Originally Posted by kyrv37

Wow, getting some great advice. Appreciate it. Thinking of going with the 4"road base. Guess I really do not need concrete. Just want it good a level.

If you are only putting a carport roof over it, you may want some slope or crown for drainage.