If the installer has not stretched the carpet tightly enough it may loosen slightly which could cause it to ripple.
Fix lumpy carpet.
Set the teeth into the carpet near the wall and push down on the stretcher handle.
Per manufacturer guidelines carpets need to be power stretched into place and then tacked down the installer must also use a knee kicker to get the carpet into the proper place on the tack less strip which will hold the carpet in place.
If the carpet is not properly stretched in it will go back to its original un stretched state.
Away from the wall.
A bubble in wall to wall carpet is an area of the rug that lifts above the subfloor and creates unsightly hills or ridges in the finished surface.
When a wall to wall carpet is installed it must be stretched tightly and then is secured in place with tack strips along the edges of the carpet.
Push down on the lever of the power carpet stretcher and embed the carpet backing on the tack strips with your hand.
Carpet buckling may occur as a result of poor installation of the carpet.
Roll a carpet roller on top of the seams to press them to the double sided tape.
Stretch and embed the carpet plant the power carpet stretcher against the opposite baseboard and add extension sections until the gripping head is about 6 in.
Use a knee kicker which is a smaller stretcher to push the carpet onto the tack strip along one of the perpendicular walls.
Then lock the stretched carpet into place by jamming it behind the tack strip with a putty or linoleum knife.
Work in 12 to 18 inch sections and fix the carpet onto the tack strip.
Operate the power stretcher with the lever and capture the excess carpet in the tack strip as you stretch.
It can cost around 200 per room to have the carpet professionally re stretched to eliminate these bubbles.
Fix carpet seams by pulling the steams apart.
Lay down a piece of double sided tape in the middle of where the seams meet.
Follow the sequence below.