Jamb Saws, And Under Cutting Door JambsJamb saws, electric or manual will be needed to address cutting door jambs. Installing laminate flooring around door jambs can be tricky. When I undercut door casings, I want the end result to look like the door casings have been installed right on top of the laminate floors. I don't want to see a gap between the laminate and the door casing. Jamb saws can also be used to undercut other objects as well, such as fireplaces. Undercutting fireplaces requires a different type of blade which is made to fit the saw. The blade is the same type used to cut ceramic tile. It has diamond particles impregnated into it and this is what does the cutting.
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Jamb Saws
In this photo is a hand saw used for cutting door jambs. I got this one at Lowes for about $12.00. The blade is off set so your hand won't scrap against the floor when cutting. The blade also swivels, so you can cut to the right or left. It works pretty good. The only drawback is it can be tough getting in tight spots with a hand saw. They also make a version of this saw that is electric made by Bosch.
What I generally use is my electric jamb saw, as in the photo to the left. Chances are if you are installing your own laminate floors you don't have an electric saw laying around in your garage. They can be a little pricey, this one cost almost 300.00.If you have a lot of door jambs to cut you may be able to rent one at a tool rental shop. I have seen less expensive jamb saws at Home Depot. The name brand is Roberts. The main objective when cutting door jambs is to cut it at the exact height and to have room under the door jamb for expansion.
I use this as a guide for determining the exact height to where I will cut the door jamb. In the photo above I'm using it to set the height of my electric saw.
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Cutting Door Jambs With the Hand Saw  
Before cutting the door jambs, make sure the floor surrounding the jamb is smooth. When using the small piece of laminate as a guide you want it to sit flat on the floor to get a nice level cut. What I like to do is to make my first cut where it is least visible ( like inside a closet) to make sure the cut is exactly the right height. There may be times when you don't have this option, you can use the sample piece of laminate with the underlayment and draw a line with a sharp pencil as a guide. When you know your cutting at the right height then continue to cut the more visible jambs. 
If you are leaving the base board on the wall and installing quarter round to cover the expansion gap, as you cut the door jamb you will have to cut into the base board about two inches or so. This is to allow expansion for the laminate. After you make that cut use a chisel or screw driver to cut that part of the base board out. As shown in photo at left.Cutting the door jamb. Lay the small piece of laminate with the pad under it up against the door jamb, lay the saw flat on the laminate using it as a guide. Hold the laminate steady as you cut. Starting on one side or the other is easier then starting in the middle.
The Right Way to Finish Off the door Jamb
Here in this photo above, is the end result after cutting the door jamb and base board. This allows the laminate to slide under the door jamb and the base board. The Wrong Way to Finish Off the Door Jamb I observed this on a job I was doing. Its an example of someone trying to compensate for not undercutting the door jamb. I think it was a do it yourself job. (CLICK ON PHOTO FOR A CLOSER LOOK)
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After you get all the door jambs cut you can move on to the next stage.Starting The Laminate Installation
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The first thing I do is to cut a small piece of the laminate, the width of the board by about 3 inches. I also cut the same size piece of underlayment as shown in this photo. 
