The mortar joint provides a significant effect on water resistance as well as appearance. Based on their functionality (greater to lower) to withstand entrance of water, common joint types are categorized as follow :-
1. Concave Joint
Concave tooling of the mortar joint compresses the mortar perfectly contrary to the units. A thick, smooth surface is developed that clears water successfully. This type of joint is mostly suitable in withstanding rain penetration and so is suggested to be utilized in walls vulnerable to wind driven rain.
2. Weathered Joint
Though it is not as useful as the concave tooled joint, but it is recognized as a water resistant mortar joint because it is compacted to some extent and clears the rain.
3. Flush Joint
The trowelling of a flush joint develops a non-compressed joint that contains probable hairline crack where the mortar is moved away from the unit. Flush joints are not recognized as perfect rain resistant mortar joints and should only be applied on walls where supplementary finishes are provided.
4. Raked Joint
The raked joint may or may not be compressed and it offers a ledge where rain water will set and probably penetrate the wall. So, it is not recognized as a rain resistant mortar joint and should not be applied on walls vulnerable to weather.
Note: As raked joints do not sustain well, the application of scored block (that needs the use of a raked joint) is not suggested for exposed walls.
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1. Concave Joint
Concave tooling of the mortar joint compresses the mortar perfectly contrary to the units. A thick, smooth surface is developed that clears water successfully. This type of joint is mostly suitable in withstanding rain penetration and so is suggested to be utilized in walls vulnerable to wind driven rain.
2. Weathered Joint
Though it is not as useful as the concave tooled joint, but it is recognized as a water resistant mortar joint because it is compacted to some extent and clears the rain.
3. Flush Joint
The trowelling of a flush joint develops a non-compressed joint that contains probable hairline crack where the mortar is moved away from the unit. Flush joints are not recognized as perfect rain resistant mortar joints and should only be applied on walls where supplementary finishes are provided.
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4. Raked Joint
The raked joint may or may not be compressed and it offers a ledge where rain water will set and probably penetrate the wall. So, it is not recognized as a rain resistant mortar joint and should not be applied on walls vulnerable to weather.
Note: As raked joints do not sustain well, the application of scored block (that needs the use of a raked joint) is not suggested for exposed walls.
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Visit my website www.sketchup3dconstruction.com to get more articles on construction & civil engineering.
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