Mortar trowel notches


Old 12-30-07, 12:30 PM
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Mortar trowel notches

A question for one of the tile pros -

I was watching one of those DIY shows hosted by a wanna' be actress and supposed DIY "expert". She was showing a homeowner how to install tile and she commented that the grooves in the mortar left by the trowel were important because they allowed air to reach the mortar, otherwise it wouldn't dry.

I thought that, for example, a 1/4" square notch provided an even 1/8" mortar layer when the tile was set. Have I been wrong all these years thinking that trowels are notched to control the thickness of the mortar?
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Old 12-30-07, 08:16 PM
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The notches allow good mortar coverage and thickness to the back of the tile and proper suction/adhesion for the tile. It has nothing to do with drying.

I've seen alot of stuff done on these DIY shows that is absolutely wrong.
Old 12-31-07, 03:49 PM
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Hollow sound under newly installed floor tile

Never mind. I intended to start a different thread.

Last edited by GaetanoL; 12-31-07 at 03:51 PM. Reason: Replied to wrong thread
Old 12-31-07, 04:36 PM
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air escape

The slots will also help the air escape so you don't end up with air pockets when you lay the tile.
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