Dave:
The carpet didn't expand due to temperature change; it stretched with
use.
I installed all of the carpets in my 21 living rooms, except for one
that I paid to have installed because I had sprained my ankle and
couldn't do the work at the time. And, that carpet was the ONLY one to
ever need restretching.
If the carpet is loose on the floor, you should be able to restretch it
with just a knee kicker. Even though you're supposed to use a power
stretcher on each installation, I wouldn't bother using a power
stretcher for something like this. Also, I wouldn't bother renting a
wall trimmer either because the amount you'll be cutting off probably
won't be enough to even use a wall trimmer. You need the carpet to run
up the wall a few inches at least to be able to use a wall trimmer.
Otherwise the carpet just twists and binds in the wall trimmer.
You need to move the furniture out of the room before you stretch the
carpet. It's best if the room is empty except for you and the carpet
installation tools.
I'd just pull the carpet back along one wall and cut 1/2 to 3/4 of an
inch or so off along it's entire length with a razor knife, straight
edge and a piece of thin plywood so as not to damage whatever's under
the carpet when you cut. You cut the carpet from the back, not from the
pile side. Then just use the knee kicker to kick the carpet back in
over the "tack strip". (See PS below) If the carpet is 20 feet long,
you can easily stretch it 1/2 inch, and 3/4 inch with some effort using
a knee kicker. You can stretch a 20 foot carpet a full inch easily with
a power stretcher. So, if the dimensions of your room are 10 by 20, cut
1/4 to3/8 inch off the 10 foot dimension of the carpet and 3/8 to 3/4
inch off the 20 foot dimension of the carpet.
Now, if you're right handed, you'll be kicking with the right knee, and
so that means you start on the left end of the wall and work your way to
the right as you kick the carpet back into place. If you're left
handed, start at the right and work your way to the left. That way,
your body weight isn't on the part of the carpet that will be moving.
When you stretch carpet, it behaves somewhat like a fishing net in that
the area right in front of the knee kicker head will stretch the most
and the stretch will diminish as you get further away from the head of
the knee kicker. You want to kick the carpet every 12 inches or so.
Don't try to stretch the carpet near the perpendicular walls because
it'll be held down by the tack strips along those walls. You can start
and stop stretching within a foot or two of the adjacent walls.
The knee kicker will have a dial on it's head which rotates to lower
steel pins. You want those pins to just go into the backing of the
carpet, but not deeper so that they jab into the underpad. There will
also be a finger release on the underside of the knee kicker by which
you can make it longer or shorter, depending on what feels comfortable
for your body size. Place your hands on each side of the head of the
knee kicker with your thumbs pressing downward on the head and the tips
of your fingers about 2 inches away from the wall and pressing down on
lightly on the carpet. When you kick with your knee, try to hold the
head of the knee kicker down with your thumbs. The carpet will jerk
forward and your finger tips will press the carpet down on the
tackstrips as it snaps back. Do that until the cut edge of the carpet
butts up against the wall or baseboard.
If the carpet is 20 feet long, you can easily stretch it 1/2 inch
Do one whole wall first, and then, pull back the carpet out along an
adjacent wall (perpendicular to the first wall) and do an encore
performance.
The carpet should be tight then.
PS: The correct term for "tack strip" is actually "tackless strip".
That's because when the Robert's Company first came out with
"Smoothedge" in the 1950's, it eliminated the need to use tacks to nail
the carpet down around it's perimeter as had been the custom prior to
then. So, "tackless strips" eliminated the need for carpet tacks.
Nowadays, people don't even know what carpet tacks are, so they call
those strips "tack strips". You know someone knows his history when he
calls it a "tackless strip".
PS: In the first Blues Brothers Movie, Jake Blues (John Belushi) throws
a box of carpet tacks out the window of the Bluesmobile to evade the
dozen or so police cars that are chasing him and Elwood.
--
nestork