Carport slab thickness and subbase.
#1
07-14-20, 03:05 PM
Carport slab thickness and subbase.
Hi,
I have a 26 feet carport I wish to make it 12 feet longer. I live in Québec, Canada, so we have pretty rough winters. I want to pour a slab that will be 12x13. I see a lot of 4in on the internet, some advocate for 6in thickness. What would be the compacted thickness for the subbase? Is it better to you 0-3/4 stone or gravel? The wall of the carport won't be on the slab, the only weight on it will be a car.
Thank you
I have a 26 feet carport I wish to make it 12 feet longer. I live in Québec, Canada, so we have pretty rough winters. I want to pour a slab that will be 12x13. I see a lot of 4in on the internet, some advocate for 6in thickness. What would be the compacted thickness for the subbase? Is it better to you 0-3/4 stone or gravel? The wall of the carport won't be on the slab, the only weight on it will be a car.
Thank you
#2
07-15-20, 05:01 AM
Group Moderator
Thicker is generally better. I think 4" (actually 3 1/2") is common just because of the lumber size. Research if you want an air entrained mixture or anything else for spalling/freeze protection.
The base depends on what you have. Often carports and driveways are poured right onto dirt and without any base. Crusher run or 0-3/4 can work well for a base but it will require proper compaction before pouring. Clean gravels can be used and don't require compaction.
The base depends on what you have. Often carports and driveways are poured right onto dirt and without any base. Crusher run or 0-3/4 can work well for a base but it will require proper compaction before pouring. Clean gravels can be used and don't require compaction.
