During my complete renovation of our concrete staircase with overlying slate tiles, a new problem has now been discovered. I have removed all the slate tiles and can see that the wet mortar and the damp concrete slab have been against the underside of the entrance door. I'm either talking about the door frame here or if it's the sill. If it is the sill, then it is quite slender. Anyway - there is a substantial moisture damage here. The wood is porous and water runs out of it if you poke it with a knife.
The moisture damage extends all the way under the vertical "posts" to the right and left in the picture, under the side windows and door. My question now is - how do I solve this? My thought is to replace the damaged wood with new wood, but with sill gasket underneath and additionally a flashing directly under the door so that rainwater runs out a bit.
The question is, can this be done without dismantling the entire door with side windows? That would be a very cumbersome project right now, I feel. Can it be done another way? What would you do in my situation?
I think it's a door frame and you'll need to remove the door + side pieces to replace the bad part.
Have you checked how the stairs are sloping? If you have a slope towards the door, unfortunately, you have more problems.
If you don't have an outward slope, you'll probably need to fix that at the same time, otherwise, the moisture damage will return.
Thanks for the response! Does it sound complicated to remove the door and side panels? Regarding the slope of the stairs, I'm obviously not completely sure, but right now it's raining here, and the half-meter closest to the door is still dry. Sometimes with wind combined with rain, it does get quite wet all the way to the door. Or during snowfall. However, I think the problem here is due to moisture migration in the old mortar under the slate tiles. It was just wet sand when I lifted the tiles. According to my theory, the moisture has traveled in the sand and dampened the frame even though it rarely rains all the way to it. I will still, of course, check the slope, but I think it should have been noticeable even with today's rain amounts, but now it's dry towards the door.
By the way, if one were to more or less wrap the new frame in syllpapp, i.e., underneath and up the sides, wouldn't that potentially help even if the slope of the stairs is incorrect? The house consists of a concrete slab, so the moisture wouldn't directly affect any other wood than the frame itself. Just a thought?
I actually don't really know how to fix a threshold to make it moisture-proof.
You'll have to hope that someone more knowledgeable than me answers your questions.
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