The trimmer is not going to make a special trip back to install the base after carpet is installed.
Installing baseboard molding over carpet.
If you are not intending to install quarter round or base shoe the baseboard should.
If the molding is slightly long trim it at angled 1 16 inch increments from the end to fit the wall.
Once the trim is fastened remove the short baseboard pieces and move these along as you install the baseboard.
However when installing the baseboard later painting and applying caulk can be a more tedious task to avoid mixing it in the carpet.
Hammer tack nails through these holes into the wall plate.
You can see here how the back of the molding is carved out to fit right over my existing molding.
If you are not intending to install quarter round or base shoe the baseboard should be installed snugly on top of the carpet.
My existing baseboard is really narrow not anywhere near as wide as the sample the manufacturer shows.
The idea is that you should.
I ordered one 8ft.
If you plan to install baseboard moulding before adding carpet it needs to be installed 1 inch above floor level to allow room for both pad and carpet.
This technique also leaves more of that handsome baseboard showing above the carpet.
When the carpet is installed that is more easily tucked into place beneath the trim.
Then touch up base if need be.
Piece for this project.
Baseboard first set on 3 8 wood lath strips tack less set between 3 8 1 2 inch away padding brought up to tack less and carpet installed and stretched over tack less and tucked under base.
Try adding painters tape over the baseboard for protection.
Lay them flat on the floor every few feet and then cut the base to fit rest it on the spacers and nail it into place.
Fit the molding to the wall flush against the carpet.
Carpet installers prefer to cut the carpet a little long and tuck the excess into the gap for a neater job.
Baseboard installed on top of carpet should be installed at approximately the same height with this exception.
This is the basic method for baseboard installation for carpet applications.
If adding baseboards after carpet is laid it should be installed at the same height as without carpet.
Nail the baseboard in place with the sticks resting only lightly on the surface of the carpet.
Here is a picture to show you how it fits over my baseboard.
It does fit right over the top beautifully.
These can be reused over and over again so hold onto them.
Drill 1 16 inch holes every 16 inches through the baseboard angled downward toward the wall plate.
The carpet installer can run the tack strip and carpet right up next to the wall.