The inspector suggested that water gets in under the window sills, which causes the facade to crack at the corners of the windows. From what I understand, you should pry out the window sills and fill in some sealant here? What sealant should be used?
In the picture, it looks like the salningslist (the one that has cracked - or is it just the paint?) is resting on the flashing, which causes it to absorb water from there and dry less effectively. There should be a 5-10 mm gap there, and I don't agree with sealing there if that's what the inspector meant?
However, you should apply some sealant (like good quality outdoor latex caulk, e.g., Casco) where there's a hole behind the brick.
Also, take the opportunity to improve the sealing between the glass and the aluminum strip at the bottom. I have similar windows, and over time, the seal there cracks, causing water on the pane to drip into the aluminum strip and run out towards the sides where the aluminum strip ends. This eventually causes the frames to rot (been there...)
Regarding the salningslist, I have brought it up in another thread, it should be shortened as you say by 5-10 mm. However, this is about the windowsill itself. According to the inspector, water is entering between the black windowsill and the brick wall and then further down under the sill. The water causes the facade to crack at the edges of the facade under the windowsill in the 2 corners. This also applies to basement windows.
OK, then you just need to pry with something like a putty knife just enough to flex the sheet metal without bending it permanently and apply sealant. Make sure to get one that is highly elastic to reduce the risk of it cracking over time.
Last time I bought Bostik Silmax which can handle 25% joint movement. Bauhaus had a significantly lower price on it, I think it was almost half the price compared to K-rauta when I compared.
I usually avoid silicone since you can't paint over it, and it's a nightmare to remove if you want to paint later (Maybe not likely in your case here - but it's good to know )
Why do you think it is better than the others? What are you comparing it to?
I have tried all kinds, both cheap and expensive. Some have been better and others worse. It's only over time you notice the difference. Tec7 has (for me) never cracked and has worked well for painting. Other similar products have somehow discolored the paint over time, so you can see through the paint where the sealant is. With unpainted sealants, I've seen that white sealants easily turn yellow, which I haven't seen with Tec7.
I have tried a little of everything, cheap and expensive. Some have been better and others worse. It's only over time that you notice the difference. Tec7 has (for me) never cracked and has worked well to paint on. Other similar products have somehow discolored the paint over time, so you can see through the paint where the sealant is. I've seen that unpainted sealants, white ones in particular, tend to yellow, but I haven't noticed that with tec7.
Silicone contains vinegar that causes the sheet metal to rust, latex caulk should be used indoors. Better to find the right product than to compare brands.
