Replacing windows

[Duece22]

So I ordered replacement windows for my upstairs. They are all older and drafty. What is the best product to fill the gaps with? Caulk or an insulation type spray?

[catchatoad]

https://www.walmart.com/ip/GREAT-STU...IaAnmlEALw_wcB

I like this stuff.... good luck

[Charles Prestridge]

I agree with the non-expanding foam already suggested.

[krindgen]

If the gaps are big, just plain old fiberglass bat insulation will do cut to fit. I installed new replacements in my entire house years ago. Old windows had the sash weights, removed those and jammed insulation into the cavities. Makes a big difference.

[Duece22]

https://www.walmart.com/ip/GREAT-STU...IaAnmlEALw_wcB

I like this stuff.... good luck

This is what I was thinking but didnt know if it was the best..I piss my wife.off because I overkill all projects

[catchatoad]

This is what I was thinking but didnt know if it was the best..I piss my wife.off because I overkill all projects

Read the directions and follow them and you'll be ok..... easy to overfill the gaps.

[Buccaneer]

All of this is great but what’s your plan to seal off the outside? Assuming you have brick molding are you cladding with aluminum? What is your plan if you find rotten sills?

[wildturkey]

Flex seal I'm sure.

[BasserJim]

If the gaps are big, just plain old fiberglass bat insulation will do cut to fit. I installed new replacements in my entire house years ago. Old windows had the sash weights, removed those and jammed insulation into the cavities. Makes a big difference.

Fiberglass batts aren’t an air stop. You’re better off with a minimally expanding closed cell foam on the interior, and a good silicone sealer on the outside

[59tomitriton]

If ordered correctly should only need caulk

[Bassman Ia.]

If ordered correctly should only need caulk

Yep. I replaced every window in our house with Anderson's. Slide em in, shim plumb, square. The ones where I replaced with bigger Windows --- make the RO to spec, same deal

[Justfishing]

Expanding foam made for Windows and doors. Like someone above said fiberglass is not an air seal.

You want to stick the straw in as far as you can. Short burst and move it. The more of the gap you can fill the better.

[Justfishing]

Expanding foam made for Windows and doors. Like someone above said fiberglass is not an air seal.

You want to stick the straw in as far as you can. Short burst and move it. The more of the gap you can fill the better.

[Hunna]

Low expanding foam spray for door & windows.

[Duece22]

All of this is great but what’s your plan to seal off the outside? Assuming you have brick molding are you cladding with aluminum? What is your plan if you find rotten sills?

Caulk on the outside of the windows.

[Walleyeguy456]

Had all my windows replace last year. They used expanding foam then flashing over them that they caulked. We live in a Very Windy area and they are solid.

[Skeeter185]

Been a window installer for 31 years. Foam for your small areas as long as it's non expanding. If you have old wood windows after you remove the wood sashes remove the little jamb door on each side and take out weights and shove insulation up in the jamb pockets and replace jamb door. Seal on inside with silicone or painters caulk if painting. To finish properly on outside you should have the outside capped with aluminum coil but it will require someone with a brake to do it.

[218_fishing]

If you foam the windows I would highly recommend to spend the money to buy a foam gun -

https://www.homedepot.com/p/GREAT-ST...0409/202892513

https://www.homedepot.com/p/GREAT-ST...7273/202892495

That way you don't have to keep buying can every time you stop to do a window.