For most trowels used for floor-covering installations, the correct angle to hold the trowel is 45 degrees to the floor. There is a reason for this angle. First, the angle creates a bit of a hydraulic pumping action by compressing the liquid adhesive and forcing it through the notches. If you were to hold the trowel at a 90-degree angle to the subfloor, you wouldn’t get the compressing action and would just cut through the adhesive on the floor. Without the compression from the 45-degree angle placement, the adhesive may actually skip through the trowel notches and leave you with an undesirable result.
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