
Anderson 400 Series Circa 2000
I bought my house 3 years ago. We noticed a soft window sill. Additionally, on the exterior sill end cap (not covered), the wood was rotted and slimy. We also had some spring tails inside the house around the window. I ended up biting the bullet and getting a brand new construction window put in. During the removal we saw the true damage (could not see the damage on the sill as it’s vinyl encapsulated) but on the window jambs. I’m assuming water seeped down from the top of the window or wicked up from the bottom. If it was from the top why is this the extent of the damage and it didn’t travel farther up?
I’m just trying to make it make sense. We definitely had some carpenter ant activity. Unsure if it’s old or new but there was very minimal damage to the wood sheathing and studs/framing.