Replacement Window Installation?

Chris,

I think you already got this down. Just a few hints you may consider or already know about.

I like the 100% white silicone (dap) on the exterior. It is not paintable but if your windows are white, it looks good. Use a paintable caulk on inside.

If you measured each opening your new windows should only have 1/4" or less gap around sides and top which is easily caulkable.

When i set replacement vinyl windows I like to shim them and then try sliding both sash up and down until I get them just right. In cooler weather make them a little loose as they slide up and down. In warmer weather make them a little snug.

This is because vinyl expands as it gets warmer and shrinks as it gets cooler.

I like to run screws from the inside of the new windwo frame into the old opening. Some replacement windows even have holes pre-drilled for this.

I don't use expanding foam because when we measure for new windows, there is usually not enough of a gap to foam.

I did the exact same thing at my house last spring (22 windows, 3' x 6'). While the window is out, make sure that any holes in trim or the wood are well sealed. I tried three different types of caulk, and Silicone II was not the best for me. The best caulk was OSI Quad, purchased at Home Depot. It is very sticky and is the only caulk that still looks brand new after one year. Securing the window with the four or six screws included is sufficient, because caulking and trim provide additional support. For big gaps between the frame and window, I used a can of the expanding spray foam stuff.