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Sill splashing - erosion ?  RSS feed

 
Ionel Catanescu
Posts: 174
Location: Timisoara, Romania, 45N, 21E, Z6-7
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Hi everyone.

I'm wondering about the best way to protect the sill area on a SB house.
Since the foundation wall on which the SB rests upon is not very tall (50cm / 20"), there will be some splashing from the area around the building to the wall itself.
The foundation part is well protected but the sill area of the SB wall is making me a little uneasy.

I have locally available heavy duty aluminum window sill that i want to install at the joint between foundation and wood sill plates.
I can then come with the render to meet this area as in the attached drawing.

Now, i have 2 thoughts:
1. Lime render should be done in such a way that it won't crack in this region
2. Careful detailing should be done to stop water ingress

Another thought : if the lime render should stop above the sill mounting heel or come down and rest upon it.
If above, i'll have to put extra flashing behind it to stop water ingress.
If it will come down, it may crack as it's a different material even if i use some reinforcing/ backing mesh.

Thoughts, experiences, something else ?
sb-sill.png
[Thumbnail for sb-sill.png]
SB sill area
 
Michael Cox
Posts: 1700
Location: Kent, UK - Zone 8
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The key to protecting walls with natural finishes is to ensure that the water doesn't get there in the first place. If water is regularly splashing down onto your foundation and wall footings then your roof overhang is inadequate. The root of the problem is the water falling to close to the structure, not the sill itself.
 
Ionel Catanescu
Posts: 174
Location: Timisoara, Romania, 45N, 21E, Z6-7
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Maybe i should explain better.

There will be a pavement outside the house.
One of it,s roles is to divert water away from the foundation.
However, it's a pretty hard surface and under hard windy rain water will hit it and bounce back onto the foundation wall or even on the sill area.
Overhangs i have a little more than 3ft (1m).
Honestly, in this scenario, only 3 times as much overhang will completely protect.
But this is impractical and rain does not always fall perpendicular to the ground.

It's for these rare ocasions that i consider my options.
 
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