Join Date: Jan 2019
Location: Central North Carolina
Jam saws are also known as toe kick saws in different parts of the country. I've used them, but recently have been using
one of the oscillating saws like the Fein Multimaster.
There are many brands of these saws available now that Fein's patents have run out. There are even a couple of versions available from Harbor Freight now and for less than you would pay to rent a jam saw. The single speed is more than adequate and for less than $20 it will pay for itself several times over, and could even disposable at the end of the job if you won't ever be needing it again, but I think it will prove so handy that you, or she, will always have one in the tool kit from now on. It's amazing how many other jobs they can do, and do very well. They are very handy for renovation work. I've also cut some already installed baseboard in order to provide clearance for an air conditioning register. The cut was so clean that only a little touch-up painting was necessary.
To use one of these saws for cutting a door jam I lay a piece of scrap flooring against the door jam and then place the blade of the saw on top of it. The oscillating action of the saw cuts the door jam the thickness of the flooring scrap plus the thickness of the saw blade. Since these blades are quite thin this leaves a cut that makes it easy to slide the flooring under it without binding, yet is almost invisible when the flooring job is complete. I prefer cutting the door jams this way over using a jam saw because it is less aggressive and leaves a much cleaner cut.